Identification register, Identification – Cypress CY7C1381F User Manual
Page 15
CY7C1381D, CY7C1381F
CY7C1383D, CY7C1383F
Document #: 38-05544 Rev. *F
Page 15 of 29
Identification Register Definitions
Instruction Field
CY7C1381D/CY7C1381F
(512K × 36)
CY7C1383D/CY7C1383F
(1M × 18)
Description
Revision Number (31:29)
000
000
Describes the version number.
Device Depth (28:24)
01011
01011
Reserved for internal use.
Device Width (23:18) 119-BGA
101001
101001
Defines the memory type and
architecture.
Device Width (23:18) 165-FBGA
000001
000001
Defines the memory type and
architecture.
Cypress Device ID (17:12)
100101
010101
Defines the width and density.
Cypress JEDEC ID Code (11:1)
00000110100
00000110100
Allows unique identification of SRAM
vendor.
ID Register Presence Indicator (0)
1
1
Indicates the presence of an ID
register.
Scan Register Sizes
Register Name
Bit Size (×36)
Bit Size (×18)
Instruction Bypass
3
3
Bypass
1
1
ID
32
32
Boundary Scan Order (119-ball BGA package)
85
85
Boundary Scan Order (165-ball fBGA package)
89
89
Identification Codes
Instruction
Code
Description
EXTEST
000
Captures Input/Output ring contents. Places the boundary scan register between TDI and
TDO. Forces all SRAM outputs to High-Z state.
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 operations.
SAMPLE Z
010
Captures Input/Output ring 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 Input/Output ring contents. Places the boundary scan register between TDI and
TDO. Does not affect 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
operations.
Note:
13. Bit #24 is “1” in the register definitions for both 2.5V and 3.3V versions of this device.