PM7344 S/UNI-MPH
DATA SHEET
PMC-950449
ISSUE 6
MULTI-PHY USER NETWORK INTERFACE
high causes the S/UNI-MPH 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.
IOTST:
The IOTST bit is used to allow normal microprocessor access to the test
registers and control the test mode in each block in the S/UNI-MPH for board
level testing. When IOTST is a logic 1, all blocks are held in test mode and
the microprocessor may write to a block's test mode 0 registers to manipulate
the outputs of the block and consequently the device outputs (refer to the
"Test Mode 0 Details" in the "Test Features" section).
HIZIO,HIZDATA:
The HIZIO and HIZDATA bits control the tri-state modes of the S/UNI-MPH .
While the HIZIO bit is a logic 1, all output pins of the S/UNI-MPH except the
data bus are held in a high-impedance state. The microprocessor interface is
still active. While the HIZDATA bit is a logic 1, the data bus is also held in a
high-impedance state which inhibits microprocessor read cycles.
12.1 Test Mode 0
In Test Mode 0, the S/UNI-MPH 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 (except for
RDAT[7:0], RSOC, RXPRTY, and RCA).
To enable Test Mode 0, 00H should be written to every address in the Test
Register Memory Map (400H to 7FFH) and then the IOTST bit in the Master Test
Register (Register 00CH) should be set to logic 1. Some particular I/O require
certain configuration bits to be set properly for Test Mode 0 operation to work.
These configuration requirements are detailed in the notes accompanying the
following address maps.
Reading the following address locations returns the values for the indicated
inputs to the D[7:0] bits:
PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA, INC., AND FOR ITS CUSTOMERS’ INTERNAL USE
218
PMC [ PMC-SIERRA, INC ]
