Cypress CY7C1472V25 manual Scan Register Sizes, Identification Codes, CY7C1470V25, CY7C1474V25

					CY7C1470V25
					CY7C1472V25
					CY7C1474V25
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 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.

Document #: 38-05290 Rev. *I Page 14 of 28

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