IDT70T633/1S
High-Speed 2.5V 512/256K x 18 Asynchronous Dual-Port Static RAM
Identification Register Definitions
Industrial and Commercial Temperature Ranges
Instruction Field
Revision Number (31:28)
Value
0x0
Reserved for version number
Description
IDT Device ID (27:12)
0x33B
(1)
Defines IDT part number 70T633
IDT JEDEC ID (11:1)
ID Register Indicator Bit (Bit 0)
NOTE:
1. Device ID for IDT70T631 is 0x33C.
Scan Register Sizes
Register Name
Instruction (IR)
Bypass (BYR)
Identification (IDR)
Boundary Scan (BSR)
0x33
1
Bit Size
4
1
32
Note (3)
Allows unique identification of device vendor as IDT
Indicates the presence of an ID register
5670 tbl 21
5670 tbl 22
System Interface Parameters
Instruction
EXTEST
BYPASS
IDCODE
HIGHZ
CLAMP
SAMPLE/PRELOAD
RESERVED
NOTES:
Code
0000
1111
0010
0100
0011
0001
All other codes
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 bypass register (BYR) between TDI and TDO.
Loads the ID register (IDR) 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 output drivers to a High-Z state.
Uses BYR. Forces contents of the boundary scan cells onto the device
outputs. Places the bypass register (BYR) 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.
Several combinations are reserved. Do not use codes other than those
identified above.
5670 tbl 23
1. Device outputs = All device outputs except TDO.
2. Device inputs = All device inputs except TDI, TMS, and TRST .
3. The Boundary Scan Descriptive Language (BSDL) file for this device is available on the IDT website (www.idt.com), or by contacting your local
IDT sales representative.
25
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