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S/UNI-QUAD
PMC-Sierra, Inc.
PM5349 S/UNI-QUAD
DATASHEET
PMC-971239 ISSUE 6 SATURN USER NETWORK INTERFACE (155-QUAD)
Proprietary and Confidential to PMC-Sierra, Inc., and for its Customers’ Internal Use
212
13.6
JTAG Support
The S/UNI-QUAD 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 basic boundary scan
architecture is shown below.
Figure 17: Boundary Scan Architecture
Boundary Scan
Register
Control
TDI
TDO
Device Identification
Register
Bypass
Register
Instruction
Register
and
Decode
TRSTB
TMS
TCK
Test
Access
Port
Controller
Mux
DFF
Select
Tri-state Enable