
PM7346 S/UNI-QJET
DATASHEET
PMC-960835
ISSUE 6
SATURN QUAD USER NETWORK INTERFACE FOR J2, E3, T3
PMC-SIERRA, INC. PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA INC., AND ITS CUSTOMERS’ INTERNAL USE
291
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-QJET 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-QJET for PMC's
manufacturing tests. When PMCTST is set to logic one, the S/UNI-QJET
microprocessor port becomes the test access port used to run the PMC
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.
A_TM[9:8]:
The state of the A_TM[9:8] bits internally replace the input address lines
A[9:8] respectively when PMCTST is set to logic 1. This allows for more
efficient use of the PMC manufacturing test vectors.
11.1 Test Mode 0 Details
In test mode 0, the S/UNI-QJET 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 S/UNI-QJET 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 S/UNI-QJET Master Test register is
set to logic one and the device should be left in its default state after reset unless
otherwise noted. All Test Register 1 locations of all blocks must be written with
the value 0 (see Table 23).
Reading the following address locations returns the values on the indicated
inputs:
Table 24
- Test Mode 0 Input Read Address Locations
Addr
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
40CH
TIOHM[1]
TICLK[1]
TPOH[1]
TPOHINS[1]
430H
RCLK[1]
436H
TOH[1]
TOHINS[1]
444H
RPOS[1]
RNEG[1]