CY7C1471V25
CY7C1473V25
CY7C1475V25
Document #: 38-05287 Rev. *I
Page 18 of 32
Scan Register Sizes
Register Name
Bit Size (x36)
Bit Size (x18)
Bit Size (x72)
Instruction
3
3
3
Bypass
1
1
1
ID
32
32
32
Boundary Scan Order – 165FBGA
71
52
-
Boundary Scan Order – 209BGA
-
-
110
Identification Codes
Instruction
Code
Description
EXTEST
000
Captures IO ring contents. Places the boundary scan register between TDI and
TDO. Forces all SRAM outputs to High-Z state. This instruction is not 1149.1
compliant.
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 IO 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 IO ring contents. Places the boundary scan register between TDI and
TDO. Does not affect SRAM operation. This instruction does not implement 1149.1
preload function and is therefore not 1149.1 compliant.
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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