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SN74ACT8999DW датащи(PDF) 5 Page - Texas Instruments

номер детали SN74ACT8999DW
подробное описание детали  SCAN-PATH SELECTORS WITH 8-BIT BIDIRECTIONAL DATA BUSES SCAN-CONTROLLED IEEE STD 1149.1 (JTAG) TAP MULTIPLEXERS
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производитель  TI1 [Texas Instruments]
домашняя страница  http://www.ti.com
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SN74ACT8999DW датащи(HTML) 5 Page - Texas Instruments

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SN54ACT8999, SN74ACT8999
SCANPATH SELECTORS WITH 8BIT BIDIRECTIONAL DATA BUSES
SCANCONTROLLED IEEE STD 1149.1 (JTAG) TAP MULTIPLEXERS
SCAS158D − JUNE 1990 − REVISED DECEMBER 1996
5
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
POST OFFICE BOX 1443
HOUSTON, TEXAS 77251−1443
state diagram description
The TAP proceeds through the states in Figure 1 according to IEEE Standard 1149.1. There are six stable states
(indicated by a looping arrow) and ten unstable states in the diagram. A stable state is defined as a state the
TAP can retain for consecutive TCK cycles. Any state that does not meet this criterion is an unstable state.
There are two main paths through the state diagram: one to manipulate a data register and one to manipulate
the instruction register. No more than one register can be manipulated at a time.
TMS = L
Test-Logic-Reset
Select-DR-Scan
Select-IR-Scan
Capture-DR
Shift-DR
Exit1-DR
Pause-DR
Exit2-DR
Update-DR
Capture-IR
Shift-IR
Exit1-IR
Pause-IR
Exit2-IR
Update-IR
TMS = H
TMS = L
TMS = H
TMS = H
TMS = L
TMS = L
TMS = L
TMS = L
TMS = H
TMS = H
TMS = L
TMS = L
TMS = H
TMS = H
TMS = H
TMS = H
TMS = H
TMS = H
TMS = L
TMS = L
TMS = H
TMS = H
TMS = H
TMS = L
TMS = L
TMS = H
TMS = H
TMS = L
TMS = L
TMS = L
TMS = L
Run-Test / Idle
Figure 1. TAP-Controller State Diagram


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