Cypress CY7C638xx ユーザーズマニュアル

Document 38-08035 Rev. *K

Page 18 of 83

The Silicon IDs for enCoRe II devices are stored in SROM tables in the part, as shown in 

The Silicon ID can be read out from the part using SROM Table reads (Table 0). This is demonstrated in the following pseudo code.

As mentioned in the section 

 on page 14, the SROM variables occupy address F8h through FFh in the SRAM. Each of the

variables and their definition is given in the section 

AREA SSCParmBlkA(RAM,ABS)

    org  F8h // Variables are defined starting at address F8h

SSC_KEY1: 

 ; F8h  supervisory key

SSC_RETURNCODE:  

blk 1 ; F8h  result code

SSC_KEY2 : 

 

blk 1  ;F9h  supervisory stack ptr key

SSC_BLOCKID: 

 

blk 1 ; FAh  block ID

SSC_POINTER: 

 

blk 1 ; FBh  pointer to data buffer

SSC_CLOCK: 

 

blk 1 ; FCh  Clock

SSC_MODE: 

 

blk 1 ; FDh  ClockW ClockE multiplier

SSC_DELAY: 

 

blk 1 ; FEh  flash macro sequence delay count

SSC_WRITE_ResultCode: blk 1 ; FFh  temporary result code

_main:
           mov   A, 0
           mov   [SSC_BLOCKID], A// To read from Table 0 - Silicon ID is stored in Table 0
//Call SROM operation to read the SROM table 

mov   X, SP 

  ; copy SP into X

   

mov   A, X  

  ; A temp stored in X

   

add   A, 3               ; create 3 byte stack frame (2 + pushed A)

   

mov   [SSC_KEY2], A      ; save stack frame for supervisory code

   ; load the supervisory code for flash operations
   

mov   [SSC_KEY1], 3Ah  ;FLASH_OPER_KEY - 3Ah

 

mov      A,6 

  ; load A with specific operation. 06h is the code for Table read 

  

SSC 

  ; SSC call the supervisory ROM 

// At the end of the SSC command the silicon ID is stored in F8 (MSB) and F9(LSB) of the SRAM

.terminate:

    jmp .terminate

Silicon ID 

[15-8]

Silicon ID 

[7-0]

Family/

Die ID 

Revision 

ID