23

IDT70T653M

High-Speed 2.5V 512K x 36 Asynchronous Dual-Port Static RAM

Industrial and Commercial Temperature Ranges

Identification Register Definitions

Value

Array B

Value

Array A

Description

Revision Number (31:28)

0x0

Revision Number (63:60)

0x0

Reserved for Version number

IDT Device ID (27:12)

0x33B

IDT Device ID (59:44)

0x33B

Defines IDT Part number

IDT JEDEC ID (11:1)

0x33

IDT JEDEC ID (43:33)

0x33

Allows unique identification of device vendor as IDT

ID Register Indicator Bit (Bit 0)

1

ID Register Indicator Bit (Bit 32)

1

Indicates the presence of an ID Register

5679 tbl 21

Scan Register Sizes

Register Name

Bit Size

Array A

Bit Size

Array B

Bit Size

70T653M

Instruction (IR)

4

4

8

Bypass (BYR)

1

1

2

Identification (IDR)

32

32

64

Boundary Scan (BSR)

Note (3)

Note (3)

Note (3)

5679 tbl 22

System Interface Parameters

Instruction

Code

Description

EXTEST

00000000

Places the boundary scan register (BSR) between TDI and TDO.

BYPASS

11111111

Places the bypass register (BYR) between TDI and TDO.

IDCODE

00100010

Loads the ID register (IDR) with the vendor ID code and places the

register between TDI and TDO.

HIGHZ

01000100

Places the bypass register (BYR) between TDI and TDO. Forces all

device output drivers to a High-Z state.

CLAMP

00110011

Uses BYR. Forces contents of the boundary scan cells onto the device

outputs. Places the bypass register (BYR) between TDI and TDO.

SAMPLE/PRELOAD

00010001

Places the boundary scan register (BSR) between TDI and TDO.

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.

RESERVED

All Other Codes

Several combinations are reserved. Do not use codes other than those

identified above.

5679 tbl 23

NOTES:

1. Device outputs = All device outputs except TDO.

2. Device inputs = All device inputs except TDI, TMS, TCK 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.