PM5352 datasheet(63/77 Pages) PMC

63 / 77 page

PM5352 S/UNI STAR

DATA SHEET

PMC-1990421

ISSUE 2

SATURN USER NETWORK INTERFACE 155 (STAR)

PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA, INC., AND FOR ITS CUSTOMERS’ INTERNAL USE

DBCTRL:

The DBCTRL bit is used to pass control of the data bus drivers to the

CSB pin. When the DBCTRL bit is set to logic one and either IOTST

or PMCTST are logic one, the CSB pin controls the output enable for

the data bus. While the DBCTRL bit is set, holding the CSB pin high

causes the S/UNI-STAR to drive the data bus and holding the CSB pin

low tri-states the data bus. The DBCTRL bit overrides the HIZDATA

bit. The DBCTRL bit is used to measure the drive capability of the

data bus driver pads.

PMCTST:

The PMCTST bit is used to configure the S/UNI-STAR for PMC's

manufacturing tests. When PMCTST is set to logic one, the

S/UNI-STAR microprocessor port becomes the test access port used

to run the PMC "canned" manufacturing test vectors. The PMCTST bit

is logically "ORed" with the IOTST bit, and can be cleared by setting

CSB to logic one or by writing logic zero to the bit.

PMCATST:

The PMCATST bit is used to configure the analog portion of the

S/UNI-STAR for PMC's manufacturing tests.

Reserved:

The reserved bit must be programmed to logic one for proper

operation.

9.2

JTAG Test Port

The S/UNI-STAR JTAG Test Access Port (TAP) allows access to the TAP

controller and the 4 TAP registers: instruction, bypass, device

identification and boundary scan. Using the TAP, device input logic levels

can be read, device outputs can be forced, the device can be identified

and the device scan path can be bypassed. For more details on the JTAG

port, please refer to the Operations section.

Table 3: Instruction Register (Length - 3 bits)

Instructions

Selected Register

Instruction Codes,

IR[2:0]

EXTEST

Boundary Scan

000

IDCODE

Identification

001

SAMPLE

Boundary Scan

010

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