Cypress CY7C1143V18 - Manual (Page 18)

CY7C1141V18, CY7C1156V18
CY7C1143V18, CY7C1145V18
Document Number: 001-06583 Rev. *D Page 18 of 28
Identification Register Definitions
Instruction Field
Value
Description
CY7C1141V18 CY7C1156V18 CY7C1143V18 CY7C1145V18
Revision Number
(31:29) 000 000 000 000 Version number.
Cypress Device ID
(28:12) 11010010101000101 11010010101001101 11010010101010101 11010010101100101 Defines the type of
SRAM.
Cypress JEDEC ID
(11:1) 00000110100 00000110100 00000110100 00000110100 Enables unique
identification of
SRAM vendor.
ID Register
Presence (0) 1 1 1 1 Indicates the
presence of an ID
register.
Scan Register Sizes
Register Name Bit Size
Instruction 3
Bypass 1
ID 32
Boundary Scan 107
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. This 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. This operation 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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