IDT71V3557, IDT71V3559, 128K x 36, 256K x 18, 3.3V Synchronous SRAMs with
ZBT? Feature, 3.3V I/O, Burst Counter, and Flow-Through Outputs Commercial and Industrial Temperature Ranges
JTAG Identification Register Definitions (SA Version only)
Instruction Field
Revision Number (31:28)
IDT Device ID (27:12)
IDT JEDEC ID (11:1)
ID Register Indicator Bit (Bit 0)
Value
0x2
0x209, 0x20B
0x33
1
Description
Reserved for version number.
Defines IDT part number 71V3557SA and 71V3559SA, respectively.
Allows unique identification of device vendor as IDT.
Indicates the presence of an ID register.
I5282 tbl 02
Available JTAG Instructions
Instruction
EXTEST
SAMPLE/PRELOAD
DEVICE_ID
HIGHZ
RESERVED
RESERVED
RESERVED
RESERVED
CLAMP
RESERVED
RESERVED
RESERVED
RESERVED
VALIDATE
RESERVED
BYPASS
Description
Forces contents of the boundary scan cells onto the device outputs (1) .
Places the boundary scan register (BSR) between TDI and TDO.
Places the boundary scan register (BSR) between TDI and TDO.
SAMPLE allows data from device inputs (2) and outputs (1) to be captured
in the boundary scan cells and shifted serially through TDO. PRELOAD
allows data to be input serially into the boundary scan cells via the TDI.
Loads the JTAG ID register (JIDR) with the vendor ID code and places
the register between TDI and TDO.
Places the bypass register (BYR) between TDI and TDO. Forces all
device o utput drivers to a High-Z state.
Several combinations are reserved. Do not use codes other than those
identified for EXTEST, SAMPLE/PRELOAD, DEVICE_ID, HIGHZ, CLAMP,
VALIDATE and BYPASS instructions.
Uses BYR. Forces contents of the boundary scan cells onto the device
outputs. Places the byp ass registe r (BYR) between TDI and TDO.
Same as above.
Automatically loaded into the instruction register whenever the TAP
controller passes through the CAPTURE-IR state. The lower two bits '01'
are mand ated by the IEEE std. 1149.1 specification.
Same as above.
The BYPASS instruction is used to truncate the boundary scan register
as a single bit in length.
OPCODE
0000
0001
0010
0011
0100
0101
0110
0111
1000
1001
1010
1011
1100
1101
1110
1111
I5282 tbl 04
NOTES:
1. Device outputs = All device outputs except TDO.
2. Device inputs = All device inputs except TDI, TMS, and TRST .
23
6.42
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