Cypress CY7C1148V18 Manual De Usuario
CY7C1146V18, CY7C1157V18
CY7C1148V18, CY7C1150V18
CY7C1148V18, CY7C1150V18
Document Number: 001-06621 Rev. *D
Page 17 of 27
Identification Register Definitions
Instruction Field
Value
Description
CY7C1146V18
CY7C1157V18
CY7C1148V18
CY7C1150V18
Revision Number
(31:29)
(31:29)
000
000
000
000
Version number.
Cypress Device ID
(28:12)
(28:12)
11010111100000101
11010111100001101
11010111100010101
11010111100100101 Defines the type of
SRAM.
Cypress JEDEC ID
(11:1)
(11:1)
00000110100
00000110100
00000110100
00000110100
Allows unique
identification of
SRAM vendor.
identification of
SRAM vendor.
ID Register
Presence (0)
Presence (0)
1
1
1
1
Indicates the
presence of an ID
register.
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 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.
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.
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.
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.
SRAM operation.