Cypress manual CY7C601xx, CY7C602xx, eg ti

CY7C601xx, CY7C602xx

Figure 11-3. SROM Table

	F8h	F9h	FAh			FBh		FCh	FDh	FEh	FFh
Table 0	Silicon ID	Silicon ID
	[15-8]	[7-0]
	Family /	Revision	Op			Va
Table 1							l
	Die ID	ID	R		e		id
					ra
				eg ti
					ong
					i
Table 2					n			24 MHz	24 MHz	24 MHz	24 MHz
								IOSCTR	IOSCTR	IOSCTR	IOSCTR
								at 3.30V	at 3.00V	at 2.85V	at 2.70V
Table 3	32 KHz	32 KHz	32 KHz			32 KHz
	LPOSCTR	LPOSCTR	LPOSCTR LPOSCTR
	at 3.30V	at 3.00V	at 2.85V		at 2.70V
Table 4
Table 5
Table 6
Table 7

11.6.1 Checksum Function

The Checksum function calculates a 16-bit checksum over a user specifiable number of blocks, within a single Flash macro (Bank) starting from block zero. The BLOCKID parameter is used to pass in the number of blocks to calculate the checksum over. A BLOCKID value of ‘1’ calculates the checksum of only block 0, while a BLOCKID value of ‘0’ calculates the checksum of all 256 user blocks. The 16-bit checksum is returned in KEY1 and KEY2. The parameter KEY1 holds the lower eight bits of the checksum and the parameter KEY2 holds the upper eight bits of the checksum.

The checksum algorithm executes the following sequence of three instructions over the number of blocks times 64 to be checksummed.

romx

add [KEY1], A adc [KEY2], 0

Table 11-12. Checksum Parameters

Name	Address	Description
KEY1	0,F8h	3Ah
KEY2	0,F9h	Stack Pointer value when SSC is
		executed
BLOCKID	0,FAh	Number of Flash blocks to calculate
		checksum on

Document 38-16016 Rev. *E Page 20 of 68

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