Cypress Semiconductor CY7C1527AV18 User Manual download pdf (Page 17)

CY7C1516AV18, CY7C1527AV18

CY7C1518AV18, CY7C1520AV18

Document Number: 001-06982 Rev. *C Page 17 of 30

Identification Register Definitions

Instruction Field

Value

Description

CY7C1516AV18 CY7C1527AV18 CY7C1518AV18 CY7C1520AV18

Revision Number

(31:29)

001 001 001 001 Version number.

Cypress Device ID

(28:12)

11010100010000100 11010100010001100 11010100010010100 11010100010100100 Defines the type of

SRAM.

Cypress JEDEC ID

(11:1)

00000110100 00000110100 00000110100 00000110100 Allows unique

identification of

SRAM vendor.

ID Register

Presence (0)

1111Indicates the

presence of an ID

Scan Register Sizes

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.

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