PM8610-BIAP PMC [PMC-Sierra, Inc], PM8610-BIAP Datasheet - Page 280

• Manufacturer Part Number: PM8610-BIAP
• Description: SBS Telecom Standard Product Data Sheet Preliminary
• Manufacturer: PMC [PMC-Sierra, Inc]

12.2
Proprietary and Confidential to PMC-Sierra, Inc., and for its Customers’ Internal Use
Document ID: PMC-2000168, Issue 3
DBCTRL
PMCTST
PMCATST
JTAG Test Port
The SBS JTAG Test Access Port (TAP) allows access to the TAP controller and the four 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 Section 13.
Table 25 Instruction Register (Length - 3 bits)
Instructions
EXTEST
IDCODE
SAMPLE
BYPASS
BYPASS
STCTEST
BYPASS
BYPASS
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 SBS 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 SBS for PMC's manufacturing tests. When
PMCTST is set to logic one, the SBS microprocessor port becomes the test access port used
to run the PMC "canned" manufacturing test vectors. The PMCTST can be cleared by setting
CSB to logic one or by writing logic zero to the bit.
The PMCATST bit is used to configure the analog portion of the SBS for PMC's
manufacturing tests.
Selected Register
Boundary Scan
Identification
Boundary Scan
Bypass
Bypass
Boundary Scan
Bypass
Bypass
Instruction Codes, IR[2:0]
000
001
010
011
100
101
110
111
SBS Telecom Standard Product Data Sheet
Preliminary
280