<PAGE>   1
                                                                     EXHIBIT 4.2



                          CREDIT ENHANCEMENT AGREEMENT

                                      AMONG

                         U.S. BANK NATIONAL ASSOCIATION

                                   AS TRUSTEE,

                             GREENWOOD TRUST COMPANY

                     AS MASTER SERVICER, SERVICER AND SELLER

                                       AND

                   DISCOVER RECEIVABLES FINANCING CORPORATION

                         AS CREDIT ENHANCEMENT PROVIDER

                          -----------------------------

                            DATED AS OF APRIL 4, 2000

                          ----------------------------

                          DISCOVER CARD MASTER TRUST I

                                  SERIES 2000-3

<PAGE>   2


                                TABLE OF CONTENTS


<TABLE>
<CAPTION>
                                                                                                                PAGE
                                                                                                                ----

<S>                                                                                                             <C>
Section 1. Defined Terms..........................................................................................1

Section 2. Loan...................................................................................................2

Section 3. Calculation of Amount of Interest Payable on the Loan..................................................3

Section 4. Payment of Interest on the Loan........................................................................3

Section 5. Repayment of Principal of the Loan.....................................................................3

Section 6. Payments to the Holder of the Seller Certificate and the Master Servicer...............................4

Section 7. Deposits to and Withdrawals from the Credit Enhancement Account........................................5

Section 8. Certain Additional Loans...............................................................................5

Section 9. Limited Obligation; Waiver of Setoff; Obligations Absolute.............................................6

Section 10. Investments and Information...........................................................................7

Section 11. Servicing Transfer....................................................................................7

Section 12. Representations and Warranties........................................................................7

Section 13. Covenants.............................................................................................8

Section 14. Governing Law.........................................................................................9

Section 15. Termination...........................................................................................9

Section 16. Notices...............................................................................................9

Section 17. Bankruptcy...........................................................................................10

Section 18. Limitation of Remedies...............................................................................10

Section 19. No Petition..........................................................................................10

Section 20. Amendments...........................................................................................11

Section 21. Successors and Assigns; Replacement of Credit Enhancement Provider...................................11

Section 22. Participation........................................................................................11
</TABLE>

<PAGE>   3

         CREDIT ENHANCEMENT AGREEMENT, dated as of April 4, 2000, among U.S.
BANK NATIONAL ASSOCIATION (formerly First Bank National Association, successor
trustee to Bank of America Illinois, formerly Continental Bank, National
Association) as trustee (together with its successors and assigns as trustee,
the "Trustee") for Discover Card Master Trust I (the "Trust"), GREENWOOD TRUST
COMPANY ("Greenwood") as Master Servicer, Servicer and Seller with respect to
the Trust and DISCOVER RECEIVABLES FINANCING CORPORATION as cash collateral
depositor (the "Credit Enhancement Provider").

                               W I T N E S S E T H

         WHEREAS, Greenwood as Master Servicer, Servicer and Seller and the
Trustee have entered into a Pooling and Servicing Agreement, dated as of October
1, 1993 (as the same may from time to time be amended, modified or otherwise
supplemented, the "Pooling and Servicing Agreement"), and that certain Series
Supplement, dated as of April 4, 2000 (as the same may from time to time be
amended, modified or otherwise supplemented, the "Series Supplement");

         WHEREAS, the Trust, pursuant to the Pooling and Servicing Agreement and
the Series Supplement, is issuing $526,316,000 in aggregate principal amount of
Investor Certificates of Discover Card Master Trust I, Series 2000-3 (the
"Series"), which will entitle the holders thereof to interest during the
Revolving Period, the Accumulation Period, and the Amortization Period, if any,
and principal on the Class A Expected Final Payment Date, the Class B Expected
Final Payment Date and during the Amortization Period, if any;

         WHEREAS, the principal and interest payments on the Investor
Certificates are to be funded by Principal Collections and Finance Charge
Collections received by the Trust on the Receivables; and

         WHEREAS, it is a condition to the issuance of the Investor Certificates
that at the closing on the date hereof, the Credit Enhancement Provider make a
term loan (the "Loan") to the Trust, for the benefit of the Investor
Certificateholders of the Series, of $39,473,700 (7.5% of the Series Initial
Investor Interest), for deposit in the Credit Enhancement Account to provide
additional funds to make payments on the Investor Certificates under certain
circumstances.

         NOW, THEREFORE, in consideration of the mutual covenants herein
contained, and other good and valuable consideration, the receipt and adequacy
of which are hereby expressly acknowledged, the parties hereto agree as follows:

         SECTION 1. DEFINED TERMS.

         (a) The capitalized terms used herein and not otherwise defined herein
shall have the meanings assigned to them in the Pooling and Servicing Agreement
or the Series Supplement, as applicable.

         (b) The following terms have the definitions set forth below:
<PAGE>   4

         "Interest Period" means (i) with respect to the initial Distribution
Date, the period commencing on the Series Closing Date and ending on the day
immediately preceding the initial Distribution Date and (ii) with respect to
each subsequent Distribution Date, the period commencing on the preceding
Distribution Date and ending on the day immediately preceding such Distribution
Date.

         "Lender Rate" means, with respect to each Interest Period, the prime
commercial lending rate per annum established by the Trustee, as in effect on
each day in the Interest Period.

         "LIBOR-Based Rate" means, with respect to each Interest Period, the per
annum interest rate equal to the London Interbank Offered Rate which appears on
Telerate Page 3750 at approximately 11:00 a.m. (London time) two LIBOR Business
Days prior to the first day of such Interest Period for deposits of United
States dollars for a period of time comparable to the Interest Period, and in an
amount comparable to the principal amount of the Loan, plus 0.65%.

         "Portfolio Yield" means, with respect to any Due Period, the annualized
percentage equivalent of a fraction, the numerator of which shall be the sum of
(i) the amount of Finance Charge Collections received during such Due Period,
(ii) the amount of Series Yield Collections for each Series then outstanding for
such Due Period and (iii) the amount of Series Additional Funds for each Series
then outstanding for such Due Period, and the denominator of which shall be the
total amount of Principal Receivables in the Trust as of the first day of such
Due Period.

         "Provider Amount" means, with respect to each Distribution Date, the
lesser of (i) the unpaid principal amount of the Loan (including any amounts
loaned by the Credit Enhancement Provider pursuant to Section 8 hereof) and (ii)
the amount on deposit in the Credit Enhancement Account, in each case before
giving effect to any payments, allocations or distributions on such Distribution
Date.

         "Series Interest Payment Amount" means, for any Distribution Date, an
amount equal to the amount of interest payable on the Loan on such Distribution
Date, including any accrued but unpaid interest with respect to previous
Interest Periods and interest thereon, less the amount paid to the Credit
Enhancement Provider on such Distribution Date pursuant to Section 4(a) hereof.
The Series Interest Payment Amount shall be the amount of interest payable
pursuant to this Agreement for purposes of calculating the "Credit Enhancement
Fee" for the purpose of, and as such term is defined in, the Series Supplement
and such amount shall be paid in accordance with the provisions of the Series
Supplement.

         SECTION 2. LOAN. The amount of the Loan shall be increased by the
amount of any additional loan made by the Credit Enhancement Provider pursuant
to Section 8 hereof.



                                       2
<PAGE>   5

         SECTION 3. CALCULATION OF AMOUNT OF INTEREST PAYABLE ON THE LOAN.

         (a) The Loan shall bear interest for each day during each Interest
Period with respect thereto at a rate per annum determined for such day as
follows. To the extent the unpaid portion of the principal of the Loan during
such Interest Period equals or is less than the amount on deposit in the Credit
Enhancement Account, the rate for such Interest Period on such principal portion
shall be the LIBOR-Based Rate. To the extent any portion of the unpaid principal
of the Loan exceeds such amount on deposit, the rate for such Interest Period on
such principal portion shall be the Lender Rate.

         (b) Interest shall be payable monthly in arrears on each Distribution
Date. Interest on the Loan shall be calculated on the basis of the actual number
of days elapsed during the applicable Interest Period divided by (i) 360, to the
extent the LIBOR-Based Rate is applicable, or (ii) 365 or 366, as the case may
be, to the extent the Lender Rate is applicable. The Trustee shall, as soon as
practicable, notify the Seller, the Master Servicer and the Credit Enhancement
Provider of each determination of the Lender Rate and of the LIBOR-Based Rate.
Each determination thereof by the Trustee pursuant to the provisions of this
Agreement shall be conclusive and binding on the Seller, the Master Servicer and
the Credit Enhancement Provider, in the absence of manifest error.

         (c) If any portion of interest due and payable on a Distribution Date
is not paid on such Distribution Date, the unpaid portion of such interest shall
be due and payable on the next succeeding Distribution Date. Any interest that
is not paid on the due date thereof shall accrue interest from the Distribution
Date on which such interest was due and payable to the date such interest is
actually paid at a rate per annum equal to the Lender Rate.

         SECTION 4. PAYMENT OF INTEREST ON THE LOAN. On each Distribution Date,
the Trustee as administrator of the Credit Enhancement shall pay or cause to be
paid to the Credit Enhancement Provider the amount of accrued but unpaid
interest on the Loan from the funds and in the order of priority set forth
below; provided, however, that such payments shall not exceed the amount of
accrued but unpaid interest on the Loan and that such payments will be made only
to the extent such funds are available:

         (a) interest and earnings (net of losses and investment expenses)
accrued since the preceding Distribution Date on the Provider Amount; and

         (b) the Series Interest Payment Amount, to the extent such amount has
been paid to the Trustee as administrator of the Credit Enhancement pursuant to
the Series Supplement.

         SECTION 5. REPAYMENT OF PRINCIPAL OF THE LOAN. The principal amount of
the Loan shall be due and payable on the Series Termination Date. The Trust
shall repay the unpaid principal balance of the Loan in full on or before the
Series Termination Date in accordance with the provisions of this Agreement;
provided, however, that the unpaid



                                       3
<PAGE>   6

principal amount of the Loan shall only be paid from the funds described below,
and only to the extent such funds are available.

         (a) If, as of any Distribution Date, after giving effect to all other
deposits to and withdrawals from the Credit Enhancement Account as of such
Distribution Date, the amount on deposit in the Credit Enhancement Account
exceeds the Total Maximum Credit Enhancement Amount, (i) the amount of such
excess, up to the amount, if any, by which the amount on deposit in the Credit
Enhancement Account exceeds the unpaid principal amount of the Loan, shall be
withdrawn from the Credit Enhancement Account and paid to Greenwood on behalf of
the Holder of the Seller Certificate and (ii) the remaining amount of such
excess, if any, after payment of any amounts to be paid to Greenwood on behalf
of the Holder of the Seller Certificate pursuant to clause (i) of this Section
5(a), shall be withdrawn from the Credit Enhancement Account and paid to the
Credit Enhancement Provider for application toward the unpaid principal amount
of the Loan.

         (b) On the earlier to occur of (i) the Series Termination Date and (ii)
the day on which the Class Invested Amount with respect to each Class of the
Series is paid in full, and after payment of any amounts to be paid on such day
from the Credit Enhancement Account to or for the benefit of the Investor
Certificateholders of the Series, all amounts remaining on deposit in the Credit
Enhancement Account, up to the amount of the unpaid principal amount of the
Loan, shall be withdrawn from such account and paid to the Credit Enhancement
Provider for application toward the unpaid principal amount of the Loan.

         SECTION 6. PAYMENTS TO THE HOLDER OF THE SELLER CERTIFICATE AND THE
MASTER SERVICER.

         (a) On each Distribution Date, the Trustee as administrator of the
Credit Enhancement shall pay or cause to be paid to Greenwood on behalf of the
Holder of the Seller Certificate (i) the interest and earnings (net of losses
and investment expenses) accrued since the preceding Distribution Date on an
amount equal to the positive difference, if any, between (x) the amount on
deposit in the Credit Enhancement Account and (y) the Provider Amount and (ii)
the positive difference, if any, between (x) the amount of interest and earnings
(net of losses and investment expenses) accrued since the preceding Distribution
Date on the Provider Amount and (y) the amount paid to the Credit Enhancement
Provider on such Distribution Date pursuant to Section 4(a).

         (b) On each Distribution Date, an amount equal to the amount, if any,
paid to the Trustee as administrator of the Credit Enhancement pursuant to
Section 9(b)(27) of the Series Supplement, shall be paid to Greenwood on behalf
of the Holder of the Seller Certificate.

         (c) On the earlier to occur of (i) the Series Termination Date and (ii)
the day on which the Class Invested Amount with respect to each Class of the
Series is paid in full, and after payment of any amounts to be paid on such day
from the Credit Enhancement Account to or for the benefit of the Investor
Certificateholders of the Series, any amounts remaining on deposit in the Credit
Enhancement Account that are not paid to the Credit Enhancement Provider


                                       4
<PAGE>   7

pursuant to Section 5(b) hereof shall be withdrawn from such account and paid to
Greenwood on behalf of the Holder of the Seller Certificate.

         SECTION 7. DEPOSITS TO AND WITHDRAWALS FROM THE CREDIT ENHANCEMENT
ACCOUNT.

         (a) The proceeds of the Loan made by the Credit Enhancement Provider to
the Trust, for the benefit of the Investor Certificateholders of the Series, on
the Series Closing Date and the proceeds of any additional loan made by the
Credit Enhancement Provider pursuant to Section 8 hereof, shall be deposited
into the Credit Enhancement Account. In addition, any amounts paid to the
Trustee as administrator of the Credit Enhancement on any Distribution Date with
respect to the Total Available Credit Enhancement Amount or the Available Class
B Credit Enhancement Amount pursuant to the terms of the Series Supplement also
shall be deposited into the Credit Enhancement Account upon receipt of such
funds by the Trustee.

         (b) Any withdrawals from the Credit Enhancement Account for the benefit
of the Investor Certificateholders pursuant to Section 9 of the Series
Supplement may be made by the Master Servicer or by the Trustee as administrator
of the Credit Enhancement and shall be deemed to be made first from amounts on
deposit in the Credit Enhancement Account as a result of payments of Series
Excess Servicing and other amounts to the Trustee as administrator of the Credit
Enhancement to fund the Total Available Credit Enhancement Amount, including any
Series Excess Servicing or other such amounts on deposit in the Credit
Enhancement Account as a result of an Alternative Credit Support Election having
been made or as a result of the occurrence of a Supplemental Credit Enhancement
Event, and only after such amounts are exhausted shall any such withdrawals be
deemed to be made from amounts on deposit in the Credit Enhancement Account that
are attributable to the Loan.

         (c) On or before any Distribution Date on which Greenwood is the Master
Servicer, all payments made pursuant to this Agreement or the Series Supplement
between the Master Servicer or the Holder of the Seller Certificate and the
Credit Enhancement Account, may be aggregated for such Distribution Date such
that Greenwood, acting as Master Servicer and as agent of the Holder of the
Seller Certificate, may make only one payment to the Credit Enhancement Account
in satisfaction of all payments of the Master Servicer and the Holder of the
Seller Certificate pursuant to this Agreement or the Series Supplement, to the
extent that all payment obligations of the Master Servicer and the Holder of the
Seller Certificate to the Credit Enhancement Account on such Distribution Date
exceed all payment obligations of the Credit Enhancement Account to the Master
Servicer and the Holder of the Seller Certificate on such Distribution Date.

         SECTION 8. CERTAIN ADDITIONAL LOANS.

         (a) Alternative Credit Support Election. In the event that an
Alternative Credit Support Election is made pursuant to the provisions of the
Series Supplement, Greenwood on behalf of the Holder of the Seller Certificate
may cause the Additional Credit Support Amount to be funded by Series Excess
Servicing and other amounts paid to the Trustee as administrator of the Credit
Enhancement to fund the Available Class B Credit Enhancement Amount, pursuant to


                                       5
<PAGE>   8

Section 9 of the Series Supplement, or may request that the Credit Enhancement
Provider make an additional loan in the amount of the Additional Credit Support
Amount. If Greenwood on behalf of the Holder of the Seller Certificate makes
such request, and if the Credit Enhancement Provider elects to make such loan,
the amount of such loan shall be added to the unpaid principal amount of the
Loan. In the event that the Alternative Credit Support Election does not become
effective, the Additional Credit Support Amount (or, if the entire amount of the
Additional Credit Support Amount is not then on deposit in the Credit
Enhancement Account, the portion of the Additional Credit Support Amount that is
then on deposit) shall be withdrawn from the Credit Enhancement Account and
repaid to Greenwood on behalf of the Holder of the Seller Certificate (or, if
such amount was loaned by the Credit Enhancement Provider, returned to the
Credit Enhancement Provider).

         (b) Supplemental Credit Enhancement Event. In the event that a
Supplemental Credit Enhancement Event occurs, Greenwood as Servicer may cause
the Supplemental Credit Enhancement Amount to be funded by Series Excess
Servicing and other amounts paid to the Trustee as administrator of the Credit
Enhancement to fund the Available Class B Credit Enhancement Amount, or may
request that the Credit Enhancement Provider make an additional loan in the
amount of the Supplemental Credit Enhancement Amount. If Greenwood as Servicer
makes such a request, and if the Credit Enhancement Provider elects to make such
loan, the amount of such loan shall be equal to the Supplemental Credit
Enhancement Amount and shall be added to the unpaid principal amount of the
Loan.

         (c) Notice. The Credit Enhancement Provider shall give prior written
notice to Moody's of the making of any loan by the Credit Enhancement Provider
other than the additional loans described in this Section 8.

         SECTION 9. LIMITED OBLIGATION; WAIVER OF SETOFF; OBLIGATIONS ABSOLUTE.

         (a) Notwithstanding any provision in any other section of this
Agreement to the contrary, the obligation to repay the Loan, together with
interest thereon, shall be without recourse to any Seller, the Master Servicer,
any Servicer, the Trustee, the Trust, any Certificateholder, or any affiliate,
officer, director, employee or person acting on behalf of any of them, and the
obligation to pay such amounts shall be limited solely to the application of
funds pursuant to this Agreement, in the manner and to the extent such funds are
available, except for the direct recourse indemnification obligation of each
successor Master Servicer pursuant to Section 11 hereof. The Credit Enhancement
Provider agrees that its interest in funds on deposit in the Credit Enhancement
Account is subordinated to the interests of the Investor Certificateholders of
the Series, as provided in this Agreement and in the Series Supplement. The
Credit Enhancement Provider further agrees that it shall have no right of setoff
or lender's lien against any Seller, the Master Servicer, any Servicer, the
Trustee, the Trust, or any Certificateholder.

         (b) The obligations of the Seller, the Trustee, the Credit Enhancement
Provider and the Master Servicer under this Agreement shall be absolute,
unconditional and irrevocable, and shall be performed strictly in accordance
with the terms of this Agreement.



                                       6
<PAGE>   9

         SECTION 10. INVESTMENTS AND INFORMATION.

         (a) The Trustee shall from time to time during the term of this
Agreement invest all amounts on deposit in the Credit Enhancement Account as the
Master Servicer shall direct, which investments shall at all times be made in
compliance with the terms of the Pooling and Servicing Agreement and the Series
Supplement.

         (b) The Master Servicer shall provide the Credit Enhancement Provider
with such background information and data with respect to the Credit Enhancement
Account as the Credit Enhancement Provider may reasonably request.

         (c) The Master Servicer shall obtain the consent of the Credit
Enhancement Provider prior to the investment in any Permitted Investments with a
stated maturity, the maturity of which is longer than as would cause them to
mature on or prior to the following Distribution Date as provided in Section
8(e) of the Series Supplement.

         SECTION 11. SERVICING TRANSFER. In the event that a successor Master
Servicer is appointed pursuant to the Pooling and Servicing Agreement, from and
after the effective date of such transfer of servicing, the successor Master
Servicer appointed pursuant to the Pooling and Servicing Agreement, and not the
former Master Servicer, shall (a) be responsible for the performance of all
servicing functions to be performed from and after such date, (b) agree to be
bound by the terms, covenants and conditions contained herein applicable to the
Master Servicer and be subject to the duties and obligations of the Master
Servicer hereunder, and (c) agree to indemnify and hold harmless the Credit
Enhancement Provider from and against any and all claims, damages, losses,
liabilities, costs or expenses whatsoever which the Credit Enhancement Provider
may incur (or which may be claimed against the Credit Enhancement Provider) by
reason of the gross negligence or willful misconduct of the successor Master
Servicer in exercising its powers and carrying out its obligations under the
Pooling and Servicing Agreement and the Series Supplement. Such transfer of
servicing shall not affect any rights or obligations of the former Master
Servicer under this Agreement that arose prior to the effective date of the
transfer of servicing, except that such former Master Servicer shall have no
obligation to indemnify the Credit Enhancement Provider as a result of any act
or failure to act of any successor Master Servicer in the performance of the
servicing functions.

         SECTION 12. REPRESENTATIONS AND WARRANTIES.

         (a) The Credit Enhancement Provider hereby represents and warrants to
the Master Servicer and the Trustee that:

         (i) The Credit Enhancement Provider has been duly incorporated and is
validly existing as a corporation in good standing under the laws of the State
of Delaware, and has the corporate power and authority to execute, deliver and
perform its obligations under this Agreement.

         (ii) This Agreement has been duly authorized, executed and delivered on
the part of the Credit Enhancement Provider.

                                       7
<PAGE>   10

         (iii) When executed and delivered, this Agreement will constitute a
valid and binding agreement of the Credit Enhancement Provider enforceable
against the Credit Enhancement Provider in accordance with its terms, except (A)
as the same may be limited by insolvency, bankruptcy or reorganization or other
laws relating to or affecting the enforcement of creditors' rights and (B) as
the same may be limited by general equity principles (whether considered in a
proceeding at law or in equity) and by the discretion of the court before which
any proceeding therefor may be brought.

         (b) The Master Servicer hereby represents and warrants to the Credit
Enhancement Provider and the Trustee that:

         (i) The Master Servicer has been duly incorporated and is validly
existing as a banking corporation in good standing under the laws of the State
of Delaware, and has the corporate power and authority to execute, deliver and
perform its obligations under the Pooling and Servicing Agreement, the Series
Supplement and this Agreement.

         (ii) This Agreement, the Pooling and Servicing Agreement and the Series
Supplement have been duly authorized, executed and delivered on the part of the
Master Servicer.

         (iii) When executed and delivered, each of this Agreement, the Pooling
and Servicing Agreement and the Series Supplement will constitute a valid and
binding agreement of the Master Servicer enforceable against the Master Servicer
in accordance with its terms, except (A) as the same may be limited by
insolvency, bankruptcy, receivership or reorganization or other laws relating to
or affecting the enforcement of creditors' rights and (B) as the same may be
limited by general equity principles (whether considered in a proceeding at law
or in equity) and by the discretion of the court before which any proceeding
therefor may be brought.

         (c) The Trustee hereby represents and warrants to the Credit
Enhancement Provider and the Master Servicer that:

         (i) The Trustee is organized, existing and in good standing under the
laws of the United States of America.

         (ii) The Trustee has full power, authority and right to execute,
deliver and perform this Agreement, the Pooling and Servicing Agreement and the
Series Supplement, and has taken all necessary action to authorize the
execution, delivery and performance by it of this Agreement, the Pooling and
Servicing Agreement and the Series Supplement.

         (iii) Each of this Agreement, the Pooling and Servicing Agreement and
the Series Supplement have been duly executed and delivered by the Trustee.

         SECTION 13. COVENANTS. Greenwood, as Master Servicer and on behalf of
the Holder of the Seller Certificate, covenants and agrees that, so long as this
Agreement shall remain in effect or any monetary obligation arising hereunder or
under the Series Supplement shall remain unpaid, it will change the terms and
provisions of a Credit Agreement with respect to a Greenwood Discover Card
Account or any other Account with respect to which it is the Servicer
(including, without limitation, the calculation of the amount, or the timing, of
charge-offs) only if



                                       8
<PAGE>   11

it does not believe, after a good faith assessment of the expected effects of
such change, that such change will result in a reduction of the Portfolio Yield,
for any Due Period beginning prior to the termination of the Series, to less
than the Base Rate unless such change (i) is required by any Requirements of Law
or (ii) is deemed necessary by Greenwood in its sole reasonable judgment to
maintain its credit card business on a competitive basis. For purposes of this
Section 13, "Base Rate" shall mean (i) the weighted average of the Certificate
Rates for each Class of each Series then outstanding plus (ii) 1% per annum. For
purposes of the immediately preceding sentence, the Certificate Rate for each
Class that does not have a fixed Certificate Rate shall be the actual
Certificate Rate for such Class for the Interest Accrual Period commencing in
the immediately preceding Due Period. In the event that any Additional Seller
shall transfer Receivables in Additional Accounts to the Trust, Greenwood on
behalf of the Holder of the Seller Certificate shall cause the Servicer with
respect to such Additional Accounts to make the covenant set forth above with
respect to such Additional Accounts.

         SECTION 14. GOVERNING LAW. THIS AGREEMENT SHALL BE CONSTRUED IN
ACCORDANCE WITH THE INTERNAL LAWS OF THE STATE OF NEW YORK, WITHOUT REFERENCE TO
ITS CONFLICT OF LAW PROVISIONS, AND THE OBLIGATIONS, RIGHTS AND REMEDIES OF THE
PARTIES HEREUNDER SHALL BE DETERMINED IN ACCORDANCE WITH SUCH LAWS.

         SECTION 15. TERMINATION. This Agreement shall terminate on the date on
which the Series terminates in accordance with the provisions of the Pooling and
Servicing Agreement and the Series Supplement; provided, however, that this
Agreement may be terminated by the Master Servicer at any time, without penalty,
provided that such termination does not cause the ratings of the Investor
Certificates to be lowered or withdrawn by either of the Rating Agencies; and
provided, further, that all amounts owing to the Credit Enhancement Provider
hereunder with respect to principal and interest on the Loan shall have been
paid in full. Notwithstanding the foregoing, the Credit Enhancement Provider
shall have no rights under this Agreement, and shall not be entitled to any
payments hereunder, if and for so long as there is no Loan outstanding hereunder
and no accrued but unpaid interest.

         SECTION 16. NOTICES. Unless specifically indicated otherwise herein,
all notices and other communications provided for hereunder shall be in writing
and, if to the Credit Enhancement Provider, addressed to:

                   Discover Receivables Financing Corporation
                                  12 Read's Way
                           New Castle, Delaware 19720
                  Attn: Executive Vice President and Secretary
                              Phone: (302) 323-7167
                               Fax: (302) 323-7393

or, if to the Seller or the Master Servicer, addressed to:



                                       9
<PAGE>   12

                             Greenwood Trust Company
                                  12 Read's Way
                           New Castle, Delaware 19720
                               Attn: John J. Coane
                              Phone: (302) 323-7184
                               Fax: (302) 323-7393

or, if to the Trustee, addressed to:

                         U.S. Bank National Association
                               One Illinois Center
                       111 East Wacker Drive - Suite 3000
                             Chicago, Illinois 60601
                             Attn: Patricia M. Child
                              Phone: (312) 228-9413
                               Fax: (312) 228-9401

or as to any party at such other address as shall be designated by such party in
a written notice to the other parties.

                  Any notice or other communication shall be sufficiently given
and shall be deemed given when delivered to the addressee in writing or when
transmitted by telecopier, receipt of which by the addressee is confirmed by
telephone.

         SECTION 17. BANKRUPTCY. To the extent that the Trustee, the Master
Servicer or Greenwood on behalf of the Holder of the Seller Certificate makes a
payment to the Credit Enhancement Provider or the Credit Enhancement Provider
receives any payment or proceeds with respect to the Loan, which payment or
proceeds or any part thereof are subsequently invalidated, declared to be
fraudulent or preferential, set aside or required to be repaid to a trustee,
receiver or any other party under any state or federal insolvency or bankruptcy
law then, to the extent such payment or proceeds are set aside, the amount or
part thereof intended to be satisfied shall be revived and continue in full
force and effect, as if such payment or proceeds had not been received by the
Credit Enhancement Provider.

         SECTION 18. LIMITATION OF REMEDIES. The Credit Enhancement Provider
shall not have the right to cause the Loan or any portion thereof to become due
and payable prior to the due date for the Loan as set forth herein.

         SECTION 19. NO PETITION.

         (a) The Credit Enhancement Provider, by entering into this Agreement,
hereby covenants and agrees that it will not at any time institute, join in or
otherwise cause the institution of, against any Seller, the Master Servicer or
the Trust, any bankruptcy, reorganization, arrangement, insolvency or
liquidation proceedings, or other proceedings under any United States federal or
state or similar law prior to a year and a day after the final payment of all
investor certificates issued by any trust with respect to which Greenwood is the
seller.

         (b) Each of Greenwood and the Trustee, by entering into this Agreement,
hereby covenants and agrees that it will not at any time institute, join in or
otherwise cause the



                                       10
<PAGE>   13

institution of, against the Credit Enhancement Provider, any bankruptcy,
reorganization, arrangement, insolvency or liquidation proceedings, or other
proceedings under any United States federal or state or similar law prior to a
year and a day after the final payment of all investor certificates issued by
any trust with respect to which Greenwood is the seller.

         SECTION 20. AMENDMENTS. This Agreement shall not be amended or modified
without the written consent of each of the parties hereto. No amendment hereto
shall become effective without prior confirmation from the Rating Agencies that
such amendment will not cause a lowering or withdrawal of the then current
ratings of the Investor Certificates of the Series. The Master Servicer shall
provide a copy of any amendment hereto to the Rating Agencies.

         SECTION 21. SUCCESSORS AND ASSIGNS; REPLACEMENT OF CREDIT ENHANCEMENT
PROVIDER.

         (a) This Agreement shall be binding upon, and inure to the benefit of,
the Trustee, the Sellers, the Servicers, the Master Servicer and the Credit
Enhancement Provider and their respective successors and permitted assigns.

         (b) No Seller shall assign its interests hereunder and under the
Pooling and Servicing Agreement or the Series Supplement, or any portion of such
interests, except by an assignment that transfers each such interest to the same
assignee.

         (c) In the event that a successor trustee is appointed pursuant to the
provisions of the Pooling and Servicing Agreement to replace the then current
Trustee, such successor trustee, from and after its appointment, shall be the
Trustee for purposes of this Agreement and shall assume all of the rights and
obligations of the Trustee hereunder.

         (d) The Credit Enhancement Provider may not assign any of its rights or
obligations hereunder without the prior written consent of Greenwood on behalf
of the Holder of the Seller Certificate and without prior written confirmation
from the Rating Agencies that such assignment will not result in the lowering or
withdrawal of the rating of any Class of any Series then outstanding.

         SECTION 22. PARTICIPATION. Any successor Credit Enhancement Provider
that is not a special-purpose corporation that is an affiliate of Greenwood may,
without the consent of the Trustee, the Trust, any Seller, the Master Servicer,
any Servicer or any Certificateholder of the Series, sell participations to one
or more banks or other entities in all or a portion of its rights under this
Agreement (including all or a portion of the Loan); provided, however, that (a)
the Credit Enhancement Provider's obligations under this Agreement shall remain
unchanged, (b) the Credit Enhancement Provider shall remain solely responsible
to the other parties hereto for the performance of such obligations, (c) the
Trustee, the Trust, the Sellers and the Master Servicer shall continue to deal
solely and directly with the Credit Enhancement Provider in connection with the
Credit Enhancement Provider's rights and obligations under this Agreement, and
(d) the Credit Enhancement Provider shall retain the sole right to enforce the
obligations of the Trustee, the Trust, the Sellers or the Master Servicer under
this Agreement and to approve any amendment, modification or waiver of any
provision of this Agreement.


                                       11
<PAGE>   14



         IN WITNESS WHEREOF, the parties hereby have caused this Agreement to be
duly executed and delivered by the undersigned thereunto duly authorized as of
the day and year first above written.


                                         DISCOVER RECEIVABLES FINANCING
                                           CORPORATION,
                                         as Credit Enhancement Provider



                                         By       /s/ Thomas C. Schneider
                                              ----------------------------------
                                         Name:    Thomas C. Schneider
                                         Title:   Chairman and Chief Executive
                                                  Officer



                                         GREENWOOD TRUST COMPANY,
                                         as Master Servicer, Servicer and Seller


                                         By       /s/ Michael F. Rickert
                                              ----------------------------------
                                         Name:    Michael F. Rickert
                                         Title:   Assistant Vice President and
                                                  Assistant Treasurer




                                         U.S. BANK NATIONAL ASSOCIATION, as
                                         Trustee



                                         By       /s/ Patricia M. Child
                                              ----------------------------------
                                         Name:    Patricia M. Child
                                         Title:   Vice President


                                       12