Cypress CY7C1546V18 Identification Register Definitions, Scan Register Sizes, Instruction Codes

CY7C1546V18, CY7C1557V18

CY7C1548V18, CY7C1550V18

Identification Register Definitions

Instruction Field		Value			Description
	CY7C1546V18	CY7C1557V18	CY7C1548V18	CY7C1550V18
Revision Number	000	000	000	000	Version number.
(31:29)
Cypress Device ID	11010111100000100	11010111100001100	11010111100010100	11010111100100100	Defines the type of
(28:12)					SRAM.
Cypress JEDEC ID	00000110100	00000110100	00000110100	00000110100	Enables 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: 001-06550 Rev. *E Page 17 of 28

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