PI7C7300D datasheet(99/107 Pages) PERICOM

99 / 107 page

PI7C7300D

3-PORT PCI-TO-PCI BRIDGE

Page 99 of 107

Pericom Semiconductor

November 2005 - Revision 1.01

Upon activation of the TRST# reset pin, the latched instruction asynchronously changes

to the id code instruction. When the TAP controller moves into the test state other than

by reset activation, the opcode changes as TDI shifts, and becomes active on the falling

edge of TCK.

16.2

BOUNDARY-SCAN INSTRUCTION SET

The PI7C7300D supports three mandatory boundary-scan instructions (bypass,

sample/preload and extest). The table shown below lists the PI7C7300D’s boundary-scan

instruction codes. The “reserved” code should not be used.

Instruction Code

(binary)

Instruction Name

Instruction Code

(binary)

Instruction Name

0000

EXTEST

0101

Reserved

0001

SAMPLE/PRELOAD

1111

Bypass

Table 16-1 TAP PINS

Instruction

Requisite

Opcode (binary)

Description

Extest

IEEE 1149.1

Required

0000

Extest initiates testing of external circuitry, typically board-level

interconnects and off chip circuitry. Extest connects the

boundary-scan register between TDI and TDO. When Extest is

selected, all output signal pin values are driven by values shifted

into the boundary-scan register and may change only of the

falling edge of TCK. Also, when extest is selected, all system

input pin states must be loaded into the boundary-scan register on

the rising-edge of TCK.

Sample/preload

IEEE 1149.1

Required

0001

Sample/preload performs two functions:

1. A snapshot of the sample instruction is captured on the rising

edge of TCK without interfering with normal operation. The

instruction causes boundary-scan register cells associated with

outputs to sample the value being driven.

2. On the falling edge of TCK, the data held in the boundary-scan

cells is transferred to the slave register cells. Typically, the

slave latched data is applied to the system outputs via the

extest instruction.

Idcode

IEEE 1149.1

Required

0101

Reserved

Bypass

IEEE 1149.1

Required

1111

Bypass instruction selects the one-bit bypass register between

TDI and TDO pins. 0 (binary) is the only instruction that

accesses the bypass register. While this instruction is in effect,

all other test data registers have no effect on system operation.

Test data registers with both test and system functionality

perform their system functions when this instruction is selected.

16.3

TAP TEST DATA REGISTERS

The PI7C7300D contains two test data registers (bypass and boundary-scan). Each test

data register selected by the TAP controller is connected serially between TDI and TDO.

TDI is connected to the test data register’s most significant bit. TDO is connected to the

least significant bit. Data is shifted one bit position within the register towards TDO on

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