CY7C1663KV18 datasheet(18/31 Pages) CYPRESS

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Document Number: 001-44060 Rev. *O

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CY7C1663KV18/CY7C1665KV18

Identification Register Definitions

Instruction Field

Value

Description

CY7C1663KV18

CY7C1665KV18

Revision number (31:29)

000

Version number.

Cypress device ID (28:12)

11010010001010011

11010010001100011

Defines the type of SRAM.

Cypress JEDEC ID (11:1)

00000110100

Allows unique identification of SRAM

vendor.

ID register presence (0)

Indicates the presence of an ID register.

Scan Register Sizes

Bit Size

Instruction

Bypass

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.

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