CY7C1359A/GVT71256T18
Identification Register Definitions
Instruction Field
512K x 18
Description
REVISION NUMBER
(31:28)
XXXX
Reserved for revision number.
DEVICE DEPTH
(27:23)
00111
00011
Defines depth of 256K words.
Defines width of x18 bits.
Reserved for future use.
DEVICE WIDTH
(22:18)
RESERVED
(17:12)
XXXXXX
CYPRESS JEDEC ID CODE (11:1)
00011100100
1
Allows unique identification of DEVICE vendor.
Indicates the presence of an ID register.
ID Register Presence
Indicator (0)
Scan Register Sizes
Register Name
Instruction
Bit Size
3
1
Bypass
ID
32
54
Boundary Scan
Instruction Codes
Instruction
Code
Description
EXTEST
000
Captures I/O ring contents. Places the boundary scan register between TDI
and TDO. Forces all device outputs to High-Z state. This instruction is not
IEEE 1149.1-compliant.
IDCODE
001
010
Preloads ID register with vendor ID code and places it between TDI and
TDO. This instruction does not affect device operations.
SAMPLE-Z
Captures I/O ring contents. Places the boundary scan register between TDI
and TDO. Forces all device outputs to High-Z state.
RESERVED
011
100
Do not use these instructions; they are reserved for future use.
SAMPLE/PRELOAD
Captures I/O ring contents. Places the boundary scan register between TDI
and TDO. This instruction does not affect device operations. This instruction
does not implement IEEE 1149.1 PRELOAD function and is therefore not
1149.1-compliant.
RESERVED
RESERVED
BYPASS
101
110
111
Do not use these instructions; they are reserved for future use.
Do not use these instructions; they are reserved for future use.
Places the bypass register between TDI and TDO. This instruction does not
affect device operations.
Document #: 38-05120 Rev. **
Page 13 of 24
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