Cypress CY7C1303BV25 User Manual
Page 13
CY7C1306BV25
CY7C1303BV25
Document #: 38-05627 Rev. *A
Page 13 of 19
Scan Register Sizes
Register Name
Bit Size
Instruction
3
Bypass
1
ID
32
Boundary Scan
107
Instruction Codes
Instruction
Code
Description
EXTEST
000
Captures the Input/Output ring contents.
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 operation.
SAMPLE Z
010
Captures the Input/Output 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 the Input/Output ring contents. Places the boundary scan register
between TDI and TDO. Does not affect the 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 operation.