BT8376EPF datasheet(116/323 Pages) CONEXANT

Part #	BT8376EPF

Description	single chip transceivers for T1/E1 and Integrated Service Digital Network (ISDN) primary rate interfaces

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Manufacturer	CONEXANT [Synaptics Incorporated.]

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2.0 Circuit Description

Bt8370/8375/8376

2.12 Joint Test Access Group

Fully Integrated T1/E1 Framer and Line Interface

2-88

Conexant

N8370DSE

2.12 Joint Test Access Group

The Bt8370/8375/8376 incorporates printed circuit board testability circuits in

compliance with IEEE Std. P1149.1a–1993, IEEE Standard Test Access Port and

Boundary–Scan Architecture, commonly known as JTAG (Joint Test Action

Group).

The JTAG includes a Test Access Port (TAP) and several data registers. The

TAP provides a standard interface through which instructions and test data are

communicated (see Figure 2-49). A Boundary Scan Description Language

(BSDL) file for the Bt8370/8375/8376 is available from the factory upon request.

The test access port consists of the TDI, TCK, TMS, and TDO pins. An

internal power on reset circuit resets the JTAG port.

2.12.1 Instructions

In addition to the required BYPASS, SAMPLE/PRELOAD, and EXTEST

instructions, IDCODE instruction is supported. There are also two private

instructions. Table 2-25 lists the JTAG instructions, and their codes.

Figure 2-49. JTAG Diagram

JTAG Port

TCK

TMS

TDI

TDO

Table 2-25. JTAG Instructions

Instruction

Code

BYPASS

111 111

SAMPLE/PRELOAD

000 001

EXTEST

000 000

IDCODE

000 010

Private

xxx xxx

Private

xxx xxx

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