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6 srom table read description – Cypress enCoRe CY7C602xx User Manual

Page 19

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CY7C601xx, CY7C602xx

Document 38-16016 Rev. *E

Page 19 of 68

11.6 SROM Table Read Description

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

Figure 11-3.

on page 20

The Silicon ID can be read out from the part using SROM Table reads. This is demonstrated in the following pseudo code. As
mentioned in the section

SROM

on page 15, the SROM variables occupy address F8h through FFh in the SRAM. Each of the variables

and their definition are given in the section

SROM

on page 15.

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, 2

mov [SSC_BLOCKID], A// To read from Table 2 - trim values for the IMO are stored in table 2

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

Table 11-1

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

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