Cypress CY7C1292DV18 User Manual
Page 14
CY7C1292DV18
CY7C1294DV18
Document #: 001-00350 Rev. *A
Page 14 of 23
Identification Register Definitions
Instruction Field
Value
Description
CY7C1292DV18
CY7C1294DV18
Revision Number (31:29)
000
000
Version number.
Cypress Device ID (28:12)
11010011010010110
11010011010100110
Defines the type of SRAM.
Cypress JEDEC ID (11:1)
00000110100
00000110100
Unique identification of SRAM vendor.
ID Register Presence (0)
1
1
Indicates the presence of an ID register.
Scan Register Sizes
Register Name
Bit Size
Instruction
3
Bypass
1
ID
32
Boundary Scan Cells
107
Instruction Codes
Instruction
Code
Description
EXTEST
000
Captures the Input/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/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/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.