AT697E datasheet(75/154 Pages) ATMEL

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AT697E

4226G–AERO–05/09

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"

It is used to test connections between components at board level. Components output

pins are controlled by boundary scan register during Capture DR on the rising edge of

TCK.

SAMPLE/PRELOAD

This instruction is binary coded "001"

It is used to get a snapshot of the normal operation by sampling I/O states during Cap-

ture DR on the rising edge of TCK. It allows also to preload a value on the output latches

during Update DR on falling edge of TCK. It do not modify system behaviour.

IDCODE

This instruction is binary coded "111"

Value of the IDCODE is loaded during Capture DR.

Test Data Registers

The following data registers are supported in the AT697 TAP:

Bypass Register

Bypass register containing a single shift register stage is connected between TDI and

TDO.

Figure 45. Bypass Register Cell

Device ID register

Device ID register is a read only 32-bit register.

It is connected between TDI and TDO.

Figure 46. Device ID Register

ID. register value: 0x 1b64 50b1

Field Definitions:

[31:28]: Vers - Version number - 0x1

[27:12]: Part ID - Represent part number as assigned by Vendor- 0x b645

[11:01]: Manufacturer’s ID - Represent manufacturer’s ID as per JEDEC - 0x 058

[0]: Const - Constant tied to logic ’1’.

from TDI

to TDO

Clock DR

Shift DR

Vers.

Part ID

Manufacturer’s ID

Const.

0001

1011 . 0110 . 0100 . 0101

000 . 0101 . 1000

AT697E Datasheet(PDF) 75 Page - ATMEL Corporation

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