Rainbow-electronics SCAN92LV090 Uživatelský manuál stáhnout pdf (Strana 11)

Description of Boundary-Scan

Circuitry

The SCAN92LV090 features two unique Scan test modes,

each which requires a unique BSDL model depending on the

level of test access and fault coverage goals. In the first

mode (Mode0), only the TTL Inputs and Outputs of each

transceiver are accessible via a 1149.1 compliant protocol.

In the second mode (Mode1), the TTL Inputs and Outputs

are accessible by a 1149.1 compliant method while the

Differential I/O pins are accessible by a 1149.1 compatible

technique which evaluates the signal integrity and modifies

the data in the differential BSR as appropriate.

All test modes are handled by the ATPG software, and BSDL

selection should be invisible to the user.

The BYPASS register is a single bit shift register stage

identical to scan cell TYPE1. It captures a fixed logic low.

Bypass Register Scan Chain Definition

Logic 0

10124209

The INSTRUCTION register is an eight-bit register which

captures the value 00111101.

Instruction Register Scan Chain Definition

10124210

MSB

→

LSB (Mode0)

Instruction Code Instruction

00000000 EXTEST

10000010 SAMPLE/PRELOAD

10000111 CLAMP

00000110 HIGHZ

All Others BYPASS

MSB

→

LSB (Mode1)

Instruction Code Instruction

10011001 EXTEST

10010010 SAMPLE/PRELOAD

10001111 CLAMP

00000110 HIGHZ

All Others BYPASS

10124220

Mode 0 Boundary Scan Register Configuration

10124221

Mode 1 Boundary Scan Register Configuration

SCAN92LV090

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