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CY7C1470V25
CY7C1472V25
CY7C1474V25
Document #: 38-05290 Rev. *I Page 14 of 28
Scan Register Sizes
Register Name Bit Size (x36) Bit Size (x18) Bit Size (x72)
Instruction 333
Bypass 111
ID 32 32 32
Boundary Scan Order–165FBGA 71 52 –
Boundary Scan Order–209BGA – – 110
Identification Codes
Instruction Code Description
EXTEST 000 Captures I/O 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 I/O 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 I/O 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 opera-
tions.
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