AT697F datasheet(69/155 Pages) ATMEL

69 / 155 page

AT697F ADVANCE INFORMATION

7703C–AERO–6/09

Figure 44. TAP - State Machine

Test Logic Reset

Run Test/Idle

Select DR Scan

Select IR Scan

Capture DR

[1]

Shift DR

Exit_1 DR

Pause DR

Exit_2 DR

Update DR

[1]

Capture IR

Shift IR

Exit_1 IR

Pause IR

Exit_2 IR

Update IR

Transitions between

states are controlled

by TMS input value.

Due to the scan cell layout, "Capture DR" and "Update DR" are states without associated action

during the scanning of internal chains.

TAP Instructions

The following instruction are supported by the AT697 TAP.

Table 25. TAP instruction set

Binary Value

Instruction Name

Data Register

Scan Chain Accessed

000

EXTEST

Boundary scan register

Boundary scan chain

001

SAMPLE/PRELOAD

Boundary scan register

Boundary scan chain

010

BYPASS

Bypass register

Bypassscan chain

111

IDCODE

Device id register

ID register scan chain

BYPASS

This instruction is binary coded "010"

It is used to speed up shifting at board level through components that are not to be activated.

EXTEST

This instruction is binary coded "000"

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