PM7344 S/UNI-MPH
DATA SHEET
PMC-950449
ISSUE 6
MULTI-PHY USER NETWORK INTERFACE
Update-IR
The update instruction register state is used to load a new instruction into the
instruction register. The new instruction must be scanned in using the Shift-IR
state. The load occurs on the falling edge of TCK.
The Pause-DR and Pause-IR states are provided to allow shifting through the
test data and/or instruction registers to be momentarily paused.
Boundary Scan Instructions
The following is an description of the standard instructions. Each instruction
selects an serial test data register path between input, TDI and output, TDO.
Table 5
- Instruction Register
Length - 3 bits
Instructions
Selected Register Instruction Codes (IR[2:0])
Boundary Scan
EXTEST
IDCODE
SAMPLE
BYPASS
BYPASS
STCTEST
BYPASS
BYPASS
000
Identification
Boundary Scan
Bypass
Bypass
Boundary Scan
Bypass
001
010
011
100
101
110
111
Bypass
BYPASS
The bypass instruction shifts data from input, TDI to output, TDO with one TCK
clock period delay. The instruction is used to bypass the device.
EXTEST
The external test instruction allows testing of the interconnection to other
devices. When the current instruction is the EXTEST instruction, the boundary
scan register is place between input, TDI and output, TDO. Primary device
PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA, INC., AND FOR ITS CUSTOMERS’ INTERNAL USE
246
PMC [ PMC-SIERRA, INC ]
