Cypress CY7C1570V18 Identification Register Definitions, Scan Register Sizes, Instruction Codes

CY7C1566V18, CY7C1577V18

CY7C1568V18, CY7C1570V18

Identification Register Definitions

Instruction Field		Value			Description
	CY7C1566V18	CY7C1577V18	CY7C1568V18	CY7C1570V18
Revision Number	000	000	000	000	Version number.
(31:29)
Cypress Device ID	11010111000000100	11010111000001100	11010111000010100	11010111000100100	Defines the type of
(28:12)					SRAM.
Cypress JEDEC ID	00000110100	00000110100	00000110100	00000110100	Allows unique
(11:1)					identification of
					SRAM vendor.
ID Register	1	1	1	1	Indicates the
Presence (0)					presence of an ID
					register.

Scan Register Sizes

Register Name	Bit Size
Instruction	3
Bypass	1
ID	32
Boundary Scan	109

Instruction Codes

Instruction	Code	Description
EXTEST	000	Captures the input and output ring contents.
IDCODE	001	Loads the ID register with the vendor ID code and places the register between TDI and TDO.
		This operation does not affect SRAM operation.
SAMPLE Z	010	Captures the input and output contents. Places the boundary scan register between TDI and
		TDO. Forces all SRAM output drivers to a High-Z state.
RESERVED	011	Do Not Use: This instruction is reserved for future use.
SAMPLE/PRELOAD	100	Captures the input and output ring contents. Places the boundary scan register between TDI
		and TDO. Does not affect the SRAM operation.
RESERVED	101	Do Not Use: This instruction is reserved for future use.
RESERVED	110	Do Not Use: This instruction is reserved for future use.
BYPASS	111	Places the bypass register between TDI and TDO. This operation does not affect SRAM
		operation.

Document Number: 001-06551 Rev. *E Page 17 of 28

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