RELEASED
PM7351 S/UNI-VORTEX
DATA SHEET
PMC-1980582
ISSUE 5
OCTAL SERIAL LINK MULTIPLEXER
Fig. 8 Boundary Scan Architecture
Boundary Scan
TDI
Register
Device Identification
Register
Bypass
Register
Instruction
Register
and
Mux
DFF
TDO
Decode
Control
TMS
Test
Access
Port
Select
Controller
Tri-state Enable
TRSTB
TCK
The boundary scan architecture consists of a TAP controller, an instruction
register with instruction decode, a bypass register, a device identification register
and a boundary scan register. The TAP controller interprets the TMS input and
generates control signals to load the instruction and data registers. The
instruction register with instruction decode block is used to select the test to be
executed and/or the register to be accessed. The bypass register offers a single-
bit delay from primary input, TDI to primary output, TDO. The device
identification register contains the device identification code.
The boundary scan register allows testing of board inter-connectivity. The
boundary scan register consists of a shift register place in series with device
inputs and outputs. Using the boundary scan register, all digital inputs can be
PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA, INC., AND FOR ITS CUSTOMERS’ INTERNAL USE
136
PMC [ PMC-SIERRA, INC ]
