**SVX II Silicon Upgrade**

**S**ilicon **R**eadout **C**ontroller

**-SRC Transition Module Board Design-**

***Preliminary Document ***

Harvard University

[Participants]{.underline}

J. Huth (PI)

J. Oliver (Eng)

N. Felt (Eng)

S. Bailey (Grad student)

M. Spiropulu (Grad student)

C. Gay (Post doc)

P. Maksimovic (Post doc)

G. Novack (Undergrad)

P. Batra (Undergrad)

N. Scielzo (Undergrad)

S. Harder (Tech)

J. O'Kane (Tech)

**1. Introduction**

This is a preliminary document. As the design progresses a more complete
version will become available.

This document specifies the design of the Silicon Readout Controller
Transition Module or SRCTM. The SRCTM is a 9U transition board whose
purpose is to transmit commands and data from the SRC to the FIBs at a
high rate and to receive FIB errors via a status return cable. To
accomplish this the SRCTM uses the HP G-link chip and the Finisar fiber
optic Transmitter. The Gigabit rate G-link chip acts as virtual ribbon
cable interface. 20 bits of parallel data and commands from the SRC are
serialized by the G-link then transmitted to the FIB Fanout through an
optical fiber. Each FIB Fanout converts the serial data into parallel
using the receiving versions of the same components.

**2. Board design**

The SRCTM contains Four G-link Optical Transmitters and four FIB Fanout
status return cable connections as can be seen in . SVX requires 4 FIB
status return cables. ISL also requires 4 FIB status return. If the same
SRC is to control the SVX and ISL the SRCTM would need to provide for 8
FIB Fanouts. This can be accomplished by optically splitting the four
G-link fibers into eight. Also, the SRCTM will have connectors for an
optional mezzanine card containing an additional four status return
connectors. Each of the FIB status lines returned from different fibs
will be ORed providing one set of status to the SRC. A block diagram of
the SRCTM is given in .

**[Figure ]{#_Toc412602113}[-]{#_Toc412602113} - Block Diagram**

shows how G-link data enters the Board through the backplane from the
SRC. Since all of the FIBs will get the same data, one set of data will
travel along the board as a bus. The data is registered before going to
the G-link circuits. The part chosen for the registers (CY74FCT2374)
incorporates a series resistor to reduce reflection noise.

**[Figure ]{#_Toc412602114}[-]{#_Toc412602114} - Board Data Bus**

The board requires two clocks, one for the G-links and one for the
registers. These clocks are adjustable on the SRC. The clocks are split
and buffered close to the connector as seen in . The signals are
terminated and buffered once more before the G-link and register clock
input. The part chosen for the buffers (CY74FCT2244) incarcerate a
series resistor to reduce reflection noise.

[Figure ]{#_Toc412602115}[-]{#_Toc412602115} - Board Clocks

Each G-link and Finisar transmitter pair will have their own filtered
power plane and moated ground plane shown in . The data signals and
clock will cross the Moat over the portion of the ground plane which is
connected to the board plane.

**[Figure ]{#_Toc412602116}[-]{#_Toc412602116} - G-link Power and
Ground**

**3. [Physical Description]{#_Toc412602110} **

The SRCTM is 366.7 mm tall, 120mm wide and .093 inch thick. the board
will is milled to 0.063" along the top and bottom solder side. as seen
in the board has 6 layers, four layers are signal layers and two are
power layers. The top and bottom signal micro strip layers are 13.5
mills wide and have an impedance of 77 ohms. All of the high speed
signals like the data bus and the clock lines are routed on the top and
bottom layers

Top Signal Layer \_\_\_\_

Power Layer \_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_

Signal Layer \_ \_ \_

Signal Layer \_\_\_\_

Ground Layer \_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_

Bottom Signal Layer \_ \_ \_

**[Figure ]{#_Ref413753843}[-]{#_Ref413753843} Board layers**

**4. Appendix**

**[Figure ]{#_Toc412602117}[-]{#_Toc412602117}[ - FIB Status Return
Cable Connector]{#_Toc412602117}**

  ----- ---------- --- ---------- --- ---------- --- ---------- --- ---------- --- ---------- --- ----------
  Pin   Signal                                                                                    
  1     FIB_ER0+   2   FIB_ER0-   3   FIB_ER1+   4   FIB_ER1-   5   FIB_ER2+   6   FIB_ER2-   7   FIB_ER3+
  8     FIB_ER3-                                                                                  
  ----- ---------- --- ---------- --- ---------- --- ---------- --- ---------- --- ---------- --- ----------

**[Figure ]{#_Toc412602118}[-]{#_Toc412602118}[ - FIB Status Cable
Pinouts]{#_Toc412602118}**

  ----- --------------------------- -- ----- --------------------------- --- ----------- -- --- ----------- --- ----------- -- --- ----------- --- ----------- -- --- ----------- --- ----------- -- --- ----------- --- ----------- -- --- ----------- --- ----------- -- --- ----------- --- ----------- -- --- ----------- --- ----------- -- --- ----------- --- ----------- -- --- ----------- ---- ----------- -- ---- ----------- ---- ----------- -- ---- ----------- ---- ----------- -- ---- ----------- ---- ----------- -- ---- ----------- ---- ----------- -- ---- ----------- ---- ----------- -- ---- -----------
        **Mezzanine Connector A**            **Mezzanine Connector B**                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                
  Pin   Signal                         Pin   Signal                      1   FIB4_ER0+      1   FIB6_ER0+   2   FIB4_ER0-      2   FIB6_ER0-   3   FIB4_ER1+      3   FIB6_ER1+   4   FIB4_ER1-      4   FIB6_ER1-   5   FIB4_ER2+      5   FIB6_ER2+   6   FIB4_ER2-      6   FIB6_ER2-   7   FIB4_ER3+      7   FIB6_ER3+   8   FIB4_ER3-      8   FIB6_ER3-   9   FIB5_ER3-      9   FIB7_ER3-   10   FIB5_ER3+      10   FIB7_ER3+   11   FIB5_ER2-      11   FIB7_ER2-   12   FIB5_ER2+      12   FIB7_ER2+   13   FIB5_ER1-      13   FIB7_ER1-   14   FIB5_ER1+      14   FIB7_ER1+   15   FIB5_ER0-      15   FIB7_ER0-
  16    FIB5_ER0+                      16    FIB7_ER0+                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                
  ----- --------------------------- -- ----- --------------------------- --- ----------- -- --- ----------- --- ----------- -- --- ----------- --- ----------- -- --- ----------- --- ----------- -- --- ----------- --- ----------- -- --- ----------- --- ----------- -- --- ----------- --- ----------- -- --- ----------- --- ----------- -- --- ----------- --- ----------- -- --- ----------- ---- ----------- -- ---- ----------- ---- ----------- -- ---- ----------- ---- ----------- -- ---- ----------- ---- ----------- -- ---- ----------- ---- ----------- -- ---- ----------- ---- ----------- -- ---- -----------

**[Figure ]{#_Toc412602119}[-]{#_Toc412602119}[ - Optional Mezzanine
Connector for FIB 3-7]{#_Toc412602119}**

  --------------- -------- ------- -------- --------- ---------------------------------- ---- --- -- -- -- ------------ ------ --- -- -- -- ------- ------ --- -- -- -- ------------ ---- --- -- -- -- ------------- ------ --- -- -- -- ---------------------------------------- ------ -- --- -- -- ------------------------------------- ---------------- -- --- -- -- ------------------------------ ------------ --- -- -- -- --------------------------- ---- --- -- -- -- ------------------------------------ ---- -- --- -- -- ---------------------------------- ------- -- --- -- -- --------------------- ------ --- -- -- -- --------------------- ---------- --- -- -- -- ----------------------------------
  Design                                              SRCTM                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             
                                                      J3 Connector Connections                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          
  Date                                                2/2/98 14:18                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      
  **Signal**      **I**    **O**   **OT**   **I/O**   **Function**                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      
  GLD\[19:0\]     20                                  G-link Data (20 Bits)              FF   1            Fill Frame   /RES   1            Reset   /DAV   1            Data Valid   ED   1            Enable Data   /CAV   1            Command Valid (used to signal FFO RUN)   LOCK      1         G-link Transmitter Lock With RF_CLK   FIB_ERR\[3:0\]      4         FIB Fanout Error Return Line   /CS\[3:0\]   4            G-link Status chip select   SI   1            G-link Status Serial Command Input   SO      1         G-link Status Serial Data Output   READY      1         G-link Status Ready   SCLK   1            G-link Status Clock   GL_CLOCK   1            Phase Adjustable CDF 53MHz Clock
  RF_DEL_CLK      1                                   Phase Adjustable CDF 53MHz Clock                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  
  **Pin Count**   **33**   **7**   **0**    **0**     **40**                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            
  --------------- -------- ------- -------- --------- ---------------------------------- ---- --- -- -- -- ------------ ------ --- -- -- -- ------- ------ --- -- -- -- ------------ ---- --- -- -- -- ------------- ------ --- -- -- -- ---------------------------------------- ------ -- --- -- -- ------------------------------------- ---------------- -- --- -- -- ------------------------------ ------------ --- -- -- -- --------------------------- ---- --- -- -- -- ------------------------------------ ---- -- --- -- -- ---------------------------------- ------- -- --- -- -- --------------------- ------ --- -- -- -- --------------------- ---------- --- -- -- -- ----------------------------------

**[Figure ]{#_Toc412602120}[-]{#_Toc412602120}[ - J5/J6
Signals]{#_Toc412602120}**

  ----- ------------------ ----------------------------------------------------------- ------- ----------- ----------- ------- --- ----- --------- ------ --------- ----- ----- --- ----- --------- ------ --------- ----- ----- ---- ----- --------- ------ --------- ----- ----- ---- ----- --------- ------- --------- ----- ----- ---- ----- --------- ------- --------- ----- ----- ---- ----- --------- ------- --------- ----- -----
  PIN   ROW A              ROW B                                                       ROW C   ROW D       ROW E       ROW F                                                                                                                                                                                                                                                                                                          
  1     GND                FIB CLK                                                     TTL0    FIB CLK     GND         GND                                                                                                                                                                                                                                                                                                            
  2     B_MCLK             FIB CLK                                                     TTL1    FIB CLK     GND         GND                                                                                                                                                                                                                                                                                                            
  3     GND                FIB CLK                                                     TTL2    FIB CLK     GND         GND                                                                                                                                                                                                                                                                                                            
  4     B_AD_PIPE          FIB CLK                                                     TTL3    FIB CLK     GND         GND                                                                                                                                                                                                                                                                                                            
  5     GND                FIB CLK                                                     TTL4    FIB CLK     GND         GND                                                                                                                                                                                                                                                                                                            
  6     B_SYNC             FIB CLK                                                     TTL5    FIB CLK     GND         GND                                                                                                                                                                                                                                                                                                            
  7     GND                FIB CLK                                                     TTL6    FIB CLK     GND         GND     8   GND   FIB CLK   TTL7   FIB CLK   GND   GND   9   GND   FIB CLK   TTL8   FIB CLK   GND   GND   10   GND   FIB CLK   TTL9   FIB CLK   GND   GND   11   GND   FIB CLK   TTL10   FIB CLK   GND   GND   12   GND   FIB CLK   TTL11   FIB CLK   GND   GND   13   GND   FIB CLK   TTL12   FIB CLK   GND   GND
  14    ***RF_DEL_CLK***   FIB CLK                                                     TTL13   FIB CLK     GND         GND                                                                                                                                                                                                                                                                                                            
  15    GND                FIB CLK                                                     TTL14   FIB CLK     GND         GND                                                                                                                                                                                                                                                                                                            
  16    **GL_CLK**         FIB CLK                                                     TTL15   FIB CLK     GND         GND                                                                                                                                                                                                                                                                                                            
  17    GND                FIB CLK                                                     TTL16   FIB CLK     GND         GND                                                                                                                                                                                                                                                                                                            
  18    C0                 FIB CLK                                                     TTL17   FIB CLK     GND         GND                                                                                                                                                                                                                                                                                                            
  19    **/RESET**         FIB CLK                                                     TTL18   FIB CLK     GND         GND                                                                                                                                                                                                                                                                                                            
  20    C1                 FIB CLK                                                     TTL19   FIB CLK     GND         GND                                                                                                                                                                                                                                                                                                            
  21    **FF**             FIB CLK                                                     TTL20   FIB CLK     GND         GND                                                                                                                                                                                                                                                                                                            
  22    C2                 FIB CLK                                                     TTL21   FIB CLK     GND         GND                                                                                                                                                                                                                                                                                                            
  23    GND                FIB CLK                                                     TTL22   FIB CLK     GND         GND                                                                                                                                                                                                                                                                                                            
  24    C3                 FIB CLK                                                     TTL23   FIB CLK     GND         GND                                                                                                                                                                                                                                                                                                            
  25    GND                GND                                                         TTL24   GND         GND         GND                                                                                                                                                                                                                                                                                                            
  26    C4                 **READY**                                                   GND     GND         **/CS0**    GND                                                                                                                                                                                                                                                                                                            
  27    **S1**             **SCLK**                                                    GND     **/CS2**    **/CS1**    GND                                                                                                                                                                                                                                                                                                            
  28    C5                 **S0**                                                      GND     **/CS3**    GND         GND                                                                                                                                                                                                                                                                                                            
  29    GND                GND                                                         GND     GND         **/CAV**    GND                                                                                                                                                                                                                                                                                                            
  30    L_1/0              GND                                                         GND     GND         GND         GND                                                                                                                                                                                                                                                                                                            
  31    GND                **FIB_ERR0**                                                GND     **ED**      GND         GND                                                                                                                                                                                                                                                                                                            
  32    C_CLK1             **FIB_ERR1**                                                N/C     **/DAV**    **LOCK**    GND                                                                                                                                                                                                                                                                                                            
  33    GND                **FIB_ERR2**                                                GND     GND         GND         GND                                                                                                                                                                                                                                                                                                            
  34    C_CLK2             **FIB_ERR3**                                                GND     GND         GND         GND                                                                                                                                                                                                                                                                                                            
  35    **GLD18**          GND                                                         GND     GND         **GLD19**   GND                                                                                                                                                                                                                                                                                                            
  36    PIPE_RD2           **GLD16**                                                   GND     **GLD17**   GND         GND                                                                                                                                                                                                                                                                                                            
  37    GND                GND                                                         GND     GND         GND         GND                                                                                                                                                                                                                                                                                                            
  38    L1A                **GLD14**                                                   GND     **GLD15**   GND         GND                                                                                                                                                                                                                                                                                                            
  39    **GLD12**          GND                                                         GND     GND         **GLD13**   GND                                                                                                                                                                                                                                                                                                            
  40    FE_CLK1            **GLD10**                                                   GND     **GLD11**   GND         GND                                                                                                                                                                                                                                                                                                            
  41    GND                GND                                                         GND     GND         GND         GND                                                                                                                                                                                                                                                                                                            
  42    FE_CLK2            **GLD8**                                                    GND     **GLD9**    GND         GND                                                                                                                                                                                                                                                                                                            
  43    **GLD6**           GND                                                         GND     GND         **GLD7**    GND                                                                                                                                                                                                                                                                                                            
  44    BE_CLK1            **GLD4**                                                    GND     **GLD5**    GND         GND                                                                                                                                                                                                                                                                                                            
  45    GND                GND                                                         GND     GND         GND         GND                                                                                                                                                                                                                                                                                                            
  46    BE_CLK2            **GLD2**                                                    GND     **GLD3**    GND         GND                                                                                                                                                                                                                                                                                                            
  47    **GLD0**           GND                                                         GND     GND         **GLD1**    GND                                                                                                                                                                                                                                                                                                            
                                                                                                                                                                                                                                                                                                                                                                                                                                      
                           REVISED LAYOUT for use with FFO and SRC and DEM                                                                                                                                                                                                                                                                                                                                                            
                                                                                                                                                                                                                                                                                                                                                                                                                                      
                           Pins for FFO to DEM interface; N/C on SRC & SRCTM                                                                                                                                                                                                                                                                                                                                                          
                           Pins for FFO to FIB or VFO to VRB or SRC to VRB interface                                                                                                                                                                                                                                                                                                                                                  
                           Pins for FFO/SRC to SRCTM interface                                                                                                                                                                                                                                                                                                                                                                        
                           Pins for FFO to FIB clock distribution                                                                                                                                                                                                                                                                                                                                                                     
                           Pins for FFO/VFO to termination power distribution                                                                                                                                                                                                                                                                                                                                                         
                           Free pins                                                                                                                                                                                                                                                                                                                                                                                                  
  ----- ------------------ ----------------------------------------------------------- ------- ----------- ----------- ------- --- ----- --------- ------ --------- ----- ----- --- ----- --------- ------ --------- ----- ----- ---- ----- --------- ------ --------- ----- ----- ---- ----- --------- ------- --------- ----- ----- ---- ----- --------- ------- --------- ----- ----- ---- ----- --------- ------- --------- ----- -----

**[Figure ]{#_Toc412602121}[-]{#_Toc412602121}[ - J5/J6 Connector
Pinouts]{#_Toc412602121}**

**5. [Table of Figures]{#_Toc412602112}**