![](http://datasheet.mmic.net.cn/330000/PM4351_datasheet_16444271/PM4351_377.png)
STANDARD PRODUCT
PM4351 COMET
DATA SHEET
PMC-1970624
ISSUE 10
COMBINED E1/T1 TRANSCEIVER
PROPRIETARY AND CONFIDENTIAL
353
4. Writing a logic 1 to the block interrupt signal INT at address 143H, asserts the
INTB output low. In order to force INTB to the high impedance state,
registers, 110H to 1FFH must be initialized to 00H.
5. The “signal_name (OEB)” signals will set the corresponding output signal,
“signal_name”, to high impedance when set high.
6. The “signal_name (OEB)” signals will set the corresponding bidirectional
signal, “signal_name”, to an output when set low.
12.2 JTAG Test Port
The COMET JTAG Test Access Port (TAP) allows access to the TAP controller
and the 4 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.
Instruction Register
Length - 3 bits
Instructions
Selected Register
Instruction Codes,
IR[2:0]
EXTEST
IDCODE
SAMPLE
BYPASS
BYPASS
STCTEST
BYPASS
BYPASS
Boundary Scan
Identification
Boundary Scan
Bypass
Bypass
Boundary Scan
Bypass
Bypass
000
001
010
011
100
101
110
111
Identification Register
Length - 32 bits
Version number – 5H for Rev G and F, 4H for Rev E
Part Number - 4351H