参数资料
型号: WJLXT386LEB2
厂商: INTEL CORP
元件分类: 数字传输电路
英文描述: DATACOM, PCM TRANSCEIVER, PQFP100
封装: 14 X 14MM, ROHS COMPLIANT, LQFP-100
文件页数: 54/86页
文件大小: 1081K
代理商: WJLXT386LEB2
LXT386 — QUAD T1/E1/J1 Transceiver
58
Datasheet
5.5.3
Instruction Register (IR)
The IR is a 3 bit shift register that loads the instruction to be performed. The instructions are shifted
LSB first. Table 33 shows the valid instruction codes and the corresponding instruction description.
Table 33. Instruction Register – IR
Instruction
Code #
Comments
EXTEST
000
Connects the BSR to TDI and TDO. Input pins values are loaded into the BSR.
Output pins values are loaded from the BSR.
INTEST_ANALOG
010
Connects the ASR to TDI and TDO. Allows voltage forcing/sensing through AT1 and
AT2. Refer to Table 32.
SAMPLE / PRELOAD
100
Connects the BSR to TDI and TDO. The normal path between the LXT386 logic and
the I/O pins is maintained. The BSR is loaded with the signals in the I/O pins.
IDCODE
110
Connects the IDR to the TDO pin.
BYPASS
111
Serial data from the TDI input is passed to the TDO output through the 1 bit Bypass
Register.
Figure 17. Analog Test Port Application
Transceiver 2
Transceiver 3
RRING3
TRING3
RTIP3
TTIP3
RRING2
TRING2
RTIP2
TTIP2
Transceiver 0
A
n
a
log
M
u
x
RRING0
RTIP0
JTAG Port
ASR Register
AT2
AT1
1K
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