PMC-Sierra PM5349 manual Pmcatst, Test Mode 0 Details, Test Mode 0 Read Locations

PMC-Sierra, Inc.

S/UNI-QUAD

DATASHEET

PM5349 S/UNI-QUAD

PMC-971239 ISSUE 6 SATURN USER NETWORK INTERFACE (155-QUAD)

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-QUAD 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-QUAD for PMC's manufacturing tests. When PMCTST is set to logic one, the S/UNI-QUAD 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-QUAD for PMC's manufacturing tests.

Reserved:

The reserved bit must be programmed to logic one for proper operation.

12.2 Test Mode 0 Details

In test mode 0, the S/UNI-QUAD allows the logic levels on the device inputs to be read through the microprocessor interface and allows the device outputs to be forced to either logic level through the microprocessor interface. The IOTST bit in the Master Test register must be set to logic one to access the device I/O.

To enable test mode 0, the IOTST bit in the Master Test register is set to logic one and the following addresses must be written with 00H: TBD.

Reading the following address locations returns the values on the indicated inputs:

Table 7: Test Mode 0 Read Locations

Addr

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

08H

0FH

Proprietary and Confidential to PMC-Sierra, Inc., and for its Customers’ Internal Use 195