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SN74BCT8373ANT Folha de dados(PDF) 7 Page - Texas Instruments

Nome de Peças SN74BCT8373ANT
Descrição Electrónicos  SCAN TEST DEVICES WITH OCTAL D-TYPE LATCHES
Download  26 Pages
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Fabricante Electrônico  TI [Texas Instruments]
Página de início  http://www.ti.com
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SN74BCT8373ANT Folha de dados(HTML) 7 Page - Texas Instruments

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SN54BCT8373A, SN74BCT8373A
SCAN TEST DEVICES
WITH OCTAL D-TYPE LATCHES
SCBS044F – JUNE 1990 – REVISED JULY 1996
7
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
Exit1-DR, Exit2-DR
The Exit1-DR and Exit2-DR states are temporary states that end a data register scan. It is possible to return
to the Shift-DR state from either Exit1-DR or Exit2-DR without recapturing the data register.
On the first falling edge of TCK after entry to Exit1-DR, TDO goes from the active state to the high-impedance
state.
Pause-DR
No specific function is performed in the stable Pause-DR state, in which the TAP controller can remain
indefinitely. The Pause-DR state suspends and resumes data-register scan operations without loss of data.
Update-DR
If the current instruction calls for the selected data register to be updated with current data, then such update
occurs on the falling edge of TCK, following entry to the Update-DR state.
Capture-IR
When an instruction-register scan is selected, the TAP controller must pass through the Capture-IR state. In
the Capture-IR state, the instruction register captures its current status value. This capture operation occurs
on the rising edge of TCK, upon which the TAP controller exits the Capture-IR state.
For the
′BCT8373A, the status value loaded in the Capture-IR state is the fixed binary value 10000001.
Shift-IR
Upon entry to the Shift-IR state, the instruction register is placed in the scan path between TDI and TDO and,
on the first falling edge of TCK, TDO goes from the high-impedance state to an active state. TDO enables to
the logic level present in the least-significant bit of the instruction register.
While in the stable Shift-IR state, instruction data is serially shifted through the instruction register on each TCK
cycle. The first shift occurs on the first rising edge of TCK after entry to the Shift-IR state (i.e., no shifting occurs
during the TCK cycle, in which the TAP controller changes from Capture-IR to Shift-IR or from Exit2-IR to
Shift-IR). The last shift occurs on the rising edge of TCK, upon which the TAP controller exits the Shift-IR state.
Exit1-IR, Exit2-IR
The Exit1-IR and Exit2-IR states are temporary states used to end an instruction-register scan. It is possible
to return to the Shift-IR state from either Exit1-IR or Exit2-IR without recapturing the instruction register.
On the first falling edge of TCK after entry to Exit1-IR, TDO goes from the active state to the high-impedance
state.
Pause-IR
No specific function is performed in the stable Pause-IR state, in which the TAP controller can remain
indefinitely. The Pause-IR state suspends and resumes instruction-register scan operations without loss of
data.
Update-IR
The current instruction is updated and takes effect on the falling edge of TCK, following entry to the Update-IR
state.


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