PM5380-BI PMC-Sierra, Inc., PM5380-BI Datasheet - Page 369

• Manufacturer Part Number: PM5380-BI
• Description: Network Interface, SATURN User Network Interface (8x155) Telecom Standard Product
• Manufacturer: PMC-Sierra, Inc.

Proprietary and Confidential to PMC-Sierra, Inc., and for its customers’ internal use.
Document No.: PMC- 2010299, Issue 2
Register 0x2000: Master Test Register
This register is used to enable S/UNI-8x155 test features. All bits, except PMCTST, PMCATST
and BYPASS are reset to zero by a reset of the S/UNI-8x155 using either the RSTB input or the
Master Reset register. PMCTST are reset when CSB is high. PMCTST and PMCATST can
also be reset by writing a logic zero to the corresponding register bit.
HIZIO, HIZDATA:
DBCTRL:
PMCTST:
The HIZIO and HIZDATA bits control the tri-state modes of the S/UNI-8x155. While the
HIZIO bit is a logic one, all output pins of the S/UNI-8x155 except the data bus and output
TDO are held tri-state. The microprocessor interface is still active. While the HIZDATA bit
is a logic one, the data bus is also held in a high-impedance state which inhibits
microprocessor read cycles. The HIZDATA bit is overridden by the DBCTRL bit.
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 PMCTST is set to 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-8x155 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.
The PMCTST bit is used to configure the S/UNI-8x155 for PMC's manufacturing tests.
When PMCTST is set to logic one, the S/UNI-8x155 microprocessor port becomes the test
access port used to run the PMC "canned" manufacturing test vectors. The PMCTST bit
can be cleared by setting CSB to logic one and RSTB to logic zero or by writing logic zero
to the bit.
Bit
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
Type
R/W
W
W
W
W
W
R/W
Function
BYPASS
Reserved
PMCATST
PMCTST
DBCTRL
Reserved
HIZDATA
HIZIO
S/UNI®-8x155 ASSP Telecom Standard Product Data Sheet
Default
0
0
X
X
X
0
X
0
Released
369