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: 47/86页
文件大小: 1081K
代理商: WJLXT386LEB2
QUAD T1/E1/J1 Transceiver — LXT386
Datasheet
51
5.3
TAP Controller
The TAP controller is a 16 state synchronous state machine controlled by the TMS input and
clocked by TCK ( Figure 16).The TAP controls whether the LXT386 is in reset mode, receiving an
instruction, receiving data, transmitting data or in an idle state. Table 30 describes in detail each of
the states represented in Figure 16.
Table 30. TAP State Description
State
Description
Test Logic Reset
In this state the test logic is disabled. The device is set to normal operation mode. While in this state, the
instruction register is set to the ICODE instruction.
Run -Test/Idle
The TAP controller stays in this state as long as TMS is low. Used to perform tests.
Capture - DR
The Boundary Scan Data Register (BSR) is loaded with input pin data.
Shift - DR
Shifts the selected test data registers by one stage tword its serial output.
Update - DR
Data is latched into the parallel output of the BSR when selected.
Capture - IR
Used to load the instruction register with a fixed instruction.
Shift - IR
Shifts the instruction register by one stage.
Update - IR
Loads a new instruction into the instruction register.
Pause - IR
Pause - DR
Momentarily pauses shifting of data through the data/instruction registers.
Exit1 - IR
Exit1 - DR
Exit2 - IR
Exit2 - DR
Temporary states that can be used to terminate the scanning process.
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