GS8170DW18C-250I Просмотр технического описания (PDF) - Giga Semiconductor

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производитель

GS8170DW18C-250I

18Mb Σ1x1 Double Late Write SigmaRAM™ SRAM

Giga Semiconductor 

JTAG TAP Block Diagram

0

Bypass Register

Preliminary

GS8170DW18/36/72C-333/300/250

210

Instruction Register

TDI

TDO

ID Code Register

· 31 30 29 · · · 2 1 0

Boundary Scan Register

n· · ·· · · · · ·210

TMS

TCK

Test Access Port (TAP) Controller

Identification (ID) Register

The ID Register is a 32-bit register that is loaded with a device and vendor specific 32-bit code when the controller is put in

Capture-DR state with the IDCODE command loaded in the Instruction Register. The code is loaded from a 32-bit on-chip ROM.

It describes various attributes of the RAM as indicated below. The register is then placed between the TDI and TDO pins when the

controller is moved into Shift-DR state. Bit 0 in the register is the LSB and the first to reach TDO when shifting begins.

ID Register Contents

Die

Revision

Code

Not Used

I/O

Configuration

GSI Technology

JEDEC Vendor

ID Code

Bit # 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0

x72 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 1 0 0 1 0 0 0 1 1 0 1 1 0 0 1 1

x36 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 1 0 0 0 0 0 0 1 1 0 1 1 0 0 1 1

x18 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 1 0 1 0 0 0 0 1 1 0 1 1 0 0 1 1

Tap Controller Instruction Set

Overview

There are two classes of instructions defined in the Standard 1149.1-1990; standard (Public) instructions, and device specific

(Private) instructions. Some Public instructions are mandatory for 1149.1 compliance. Optional Public instructions must be

implemented in prescribed ways. The TAP on this device may be used to monitor all input and I/O pads. This device will not

perform INTEST but can perform the preload portion of the SAMPLE/PRELOAD command.

Rev: 1.00d 6/2002

29/36

© 2002, Giga Semiconductor, Inc.

Specifications cited are design targets and are subject to change without notice. For latest documentation contact your GSI representative.

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