<PAGE>   1
                                                                   EXHIBIT 10.2




                          REDACTED FOR CONFIDENTIALITY


                          Effective as of 20 March 2001






                               AGERE SYSTEMS INC.
  (formerly known as "the Microelectronics Group of Lucent Technologies Inc.")





                                     - and -





                    CHARTERED SEMICONDUCTOR MANUFACTURING LTD









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

                           AMENDMENT AGREEMENT (NO. 2)
                                       TO
                          TECHNOLOGY TRANSFER AGREEMENT
                             DATED 17 FEBRUARY 1998

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


                        CONFIDENTIAL TREATMENT REQUESTED
                        --------------------------------

                 THE ASTERISKED PORTIONS OF THIS DOCUMENT HAVE
                 BEEN OMITTED AND ARE FILED SEPARATELY WITH THE
                       SECURITIES AND EXCHANGE COMMISSION


<PAGE>   2

                           AMENDMENT AGREEMENT (NO. 2)

     THIS AMENDMENT AGREEMENT (NO. 2) is effective as of 20 March 2001
BETWEEN:-

(1)  AGERE SYSTEMS INC. (formerly known as the Microelectronics Group of Lucent
     Technologies Inc) ("Agere"), a Delaware corporation having an office at 555
     Union Boulevard, Allentown, Pennsylvania 18109, United States of America;
     and

(2)  CHARTERED SEMICONDUCTOR MANUFACTURING LTD ("CSM"), a company incorporated
     in Singapore with its registered office at 60, Woodlands Industrial Park D,
     Street 2, Singapore 738406;

Agere and CSM are collectively referred to herein as "Parties" and individually
referred to herein as a "Party".


     WHEREAS:-

(A)  The Parties have entered into a Technology Transfer Agreement dated 17
     February 1998 (the "Technology Transfer Agreement").

(B)  The Parties have entered into an Amendment Agreement (No. 1) to vary the
     Technology Transfer Agreement with effect from 31 July 2000.

(C)  The Parties are entering into this Amendment Agreement (No. 2) to vary the
     Technology Transfer Agreement with effect from the effective date of this
     Amendment Agreement (No. 2). Further, this Amendment Agreement (No. 2)
     shall replace the Amendment Agreement (No. 1) in its entirety.


     IT IS AGREED as follows:-

1.   INTERPRETATION

     All terms and references used in the Technology Transfer Agreement and
     which are defined or construed in the Technology Transfer Agreement but are
     not defined or construed in this Amendment Agreement (No. 2) shall have the
     same meaning and construction in this Amendment Agreement (No. 2) as in the
     Technology Transfer Agreement.

                                       1
<PAGE>   3

2.   AMENDMENTS TO THE TECHNOLOGY TRANSFER AGREEMENT

     The Parties agree that with effect from the date of this Amendment
     Agreement (No. 2):-

(A)  All references to "Lucent" in the Technology Transfer Agreement shall be
     amended by deleting the same and replacing therewith, the word "Agere".

(B)  The following exhibits of the Technology Transfer Agreement

     -    Exhibit A  Lucent's Technical Information
     -    Exhibit B  CSM's Technical Information
     -    Exhibit C  List of Subsidiaries
     -    Exhibit D  Technical Information Which May Be Disclosed To Customers

     shall be amended by deleting the said exhibits in their entirety and
     replacing therewith, the exhibits attached to this Amendment Agreement (No.
     2) and marked as

     -    "Exhibit A  Agere's Technical Information"
     -    "Exhibit B  CSM's Technical Information"
     -    "Exhibit C  List of Subsidiaries"
     -    "Exhibit D Technical Information Which May Be Disclosed to Customers"
          respectively.


3.   SAVING AND INCORPORATION

(A)  Save as expressly amended by this Amendment Agreement (No. 2), the terms
     and conditions of the Technology Transfer Agreement shall continue to be in
     full force and effect in all other respects.

(B)  The Technology Transfer Agreement and this Amendment Agreement (No. 2)
     shall be construed as one document and this Amendment Agreement (No. 2)
     shall be deemed to be part of the Technology Transfer Agreement. Where the
     context so permits, references in the Technology Transfer Agreement and in
     this Amendment Agreement (No. 2) to "the Technology Transfer Agreement" or
     "this Agreement" shall be read and construed as references to the
     Technology Transfer Agreement as amended and supplemented by this Amendment
     Agreement (No. 2).

                                       2
<PAGE>   4

4.   GOVERNING LAW

     This Amendment Agreement (No. 2) shall be interpreted in accordance with
     the law of the State of New York, United States of America, without regard
     to conflicts of laws provisions.


I N  W I T N E S S  W H E R E O F  the parties have entered into this Amendment
Agreement (No. 2) as of the later date stated below.

AGERE SYSTEMS INC. (FORMERLY KNOWN AS THE MICROELECTRONICS GROUP OF LUCENT
TECHNOLOGIES INC.)


               By:                 /s/ Judith A. Sheft
                  ---------------------------------------------------
                                    Judith A. Sheft
                   Intellectual Property & Compliance Vice President

               Date:               March 20, 2001
                    -------------------------------------------------



CHARTERED SEMICONDUCTOR MANUFACTURING LTD

               By:                  /s/ John Martin
                  ---------------------------------------------------
                                    John Martin
                             VP & Chief Technology Officer

               Date:                2 April 2001
                    -------------------------------------------------

                                       3
<PAGE>   5
                                    EXHIBIT A

                          AGERE'S TECHNICAL INFORMATION


Agere's Technical Information shall comprise the following:

(A)  Agere's **** and **** and **** Digital and Linear Process Technologies

1.   Process Flow
2.   Process Log
3.   Process recipes and tool set-ups
4.   Target film thicknesses
5.   Schematic cross-sections
6.   Electrical specifications
7.   Layout rules
8.   Transistor spice files
9.   Device characterization data
10.  Process characterization data
11.  Process capability data
12.  Yield and Defect Density Trend data
13.  Reliability Characterisation data and Qualification Reports
14.  FMA results
15.  Equipment and Materials specifications

Agere's Technical Information shall not include Agere's BiCMOS, FLASH and
embedded DRAM modules.

(B)  The following modules in Agere's ******** Process Technology:

1.   ******** module
2.   **************** module
3.   Any other module required for the manufacture of products that are jointly
     developed by Agere and *********** and that Agere agrees in writing may be
     manufactured by CSM.

CSM's right to use Agere's Technical Information specified in (B) above is
limited to such use in connection with the manufacture of such jointly-developed
products for ********* and not for the manufacture of any other products.

                                       4
<PAGE>   6
                                    EXHIBIT B

                           CSM'S TECHNICAL INFORMATION


(A)  For the following Process Modules,

(1)  CSM's ********************* Process Technology;

(2)  CSM's ********************** Process Technology;

(3)  CSM's ********************* Process Technology;

(4)  CSM's ********************* Process Module;

(5)  CSM's ********************* Process Technology and derivatives;

(6)  CSM's ************ Process Technology;

(7)  CSM's ********************* Process Technology; and

(8)  CSM's ********************* Process Technology.

CSM will provide the following Technical Information:

1.   Process Flow
2.   Process Log
3.   Process recipes and tool set-ups
4.   Target film thicknesses
5.   Schematic cross-sections
6.   Electrical specifications
7.   Layout rules
8.   Transistor spice files
9.   Device characterization data
10.  Process characterization data
11.  Process capability data
12.  Yield and Defect Density Trend data
13.  Reliability Characterisation data and Qualification Reports
14.  FMA results
15.  Equipment and Materials specifications

                                       5
<PAGE>   7

(B)  CSM's Technical Information shall not include :-

(1)  any of CSM's customer specific derivative process technologies based on any
     of CSM's baseline Process Technologies listed above in Section A of this
     Exhibit C;

(2)  CSM's ********************** Process Technologies;

(3)  CSM's *********************** Process Technologies; and

(4)  CSM's ******************** Process Technologies.

                                       6
<PAGE>   8
                                    EXHIBIT C

                              LIST OF SUBSIDIARIES


AGERE'S SUBSIDIARIES

Cirent Semiconductor
Silicon Manufacturing Partners Pte Ltd


CSM'S SUBSIDIARIES

Chartered Silicon Partners Pte Ltd

                                       7
<PAGE>   9

                                    EXHIBIT D

            TECHNICAL INFORMATION WHICH MAY BE DISCLOSED TO CUSTOMERS


The following portions of Agere's Technical Information (Exhibit A) and CSM's
Technical Information (Exhibit C) can be provided to customers under appropriate
confidentiality terms in accordance with the provisions of Article 4:


1.   Process Information

Process Name
Technology
Process Type
Number of Poly Layers
Number of Metal Layers
Poly Type
Voltage Type
Module Addition
Process Description
Starting Material Type(s)
    Non-EPI Layer
    Epitaxial Layer
Process Runsheet Spec
Non-Proprietary Process Flow Spec
Schematic Cross-Sections
Topological Design Rule Spec
Mask Bias Table Spec
Number of Reticles
Number of Masking Layers
Frame Doc #
Frame Table #
Reliability Spec
CSM's **** and ******* Bitcells

                                       8
<PAGE>   10

2.   Electrical Test Information

Spice Model Spec

     Level - 13
     Level - 28
     Level - 49
     Level - 53
     BSIM3

Electrical Parameters Spec
Electrical Test Spec
Electrical Test Program Spec


3.   Qualification Plan

Reliability Results Report (at QA)
Qual Report


4.   Phase of Process

Engineering Prototype/ Pilot Production/ Production

                                       9