
PM5317 SPECTRA-9953 Telecom Standard Product Data Sheet
Release
Proprietary and Confidential to PMC-Sierra, Inc., and for its customers’ internal use.
Document No.: PMC-2000741, Issue 5
479
Register 400AH: SPECTRA-9953 TOHI Observation Test Points
Bit
Type
Function
Default
Bit 15
R/W
UNUSED
X
Bit 14
R/W
UNUSED
X
Bit 13
R/W
UNUSED
X
Bit 12
R/W
UNUSED
X
Bit 11
R/W
TTOHEN4
X
Bit 10
R/W
TTOHEN3
X
Bit 9
R/W
TTOHEN2
X
Bit 8
R/W
TTOHEN1
X
Bit 7
R/W
TTOH4
X
Bit 6
R/W
TTOH3
X
Bit 5
R/W
TTOH2
X
Bit 4
R/W
TTOH1
X
Bit 3
R/W
STM16_CLK4
X
Bit 2
R/W
STM16_CLK3
X
Bit 1
R/W
STM16_CLK2
X
Bit 0
R/W
STM16_CLK1
X
This register is used to enable ROHI observation test points.
Access to this register is not affected by the Test Mode Address Force functions in registers
4001H and 4002H.
16.2 JTAG Test Port
The SPECTRA-9953 device supports the IEEE Boundary Scan Specification as described in the
IEEE 1149.1 standards. The Test Access Port (TAP) consists of the five standard pins, TRSTB,
TCK, TMS, TDI and TDO used to control the TAP controller and the boundary scan registers.
The TRSTB input is the active-low reset signal used to reset the TAP controller. TCK is the test
clock used to sample data on input, TDI and to output data on output, TDO. The TMS input is
used to direct the TAP controller through its states.
The SPECTRA-9953 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 the Operations section.
Table 17 Instruction Register (Length - 3 bits)
Instructions
Selected Register
Instruction Codes, IR[2:0]
EXTEST
Boundary Scan
000
IDCODE
Identification
001