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SN74ABT8996DW Datasheet(PDF) 9 Page - Texas Instruments

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No. de pieza SN74ABT8996DW
Descripción Electrónicos  10-BIT ADDRESSABLE SCAN PORTS MULTIDROP-ADDRESSABLE IEEE STD 1149.1 JTAG TAP TRANSCEIVERS
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SN74ABT8996DW Datasheet(HTML) 9 Page - Texas Instruments

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SN54ABT8996, SN74ABT8996
10-BIT ADDRESSABLE SCAN PORTS
MULTIDROP-ADDRESSABLE IEEE STD 1149.1 (JTAG) TAP TRANSCEIVERS
SCBS489C – AUGUST 1994 – REVISED APRIL 1999
9
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
connect control
The connect-control block monitors the primary TAP state to enable receipt/acknowledge of shadow protocols
in appropriate states (namely, the stable, non-Shift TAP states: Test-Logic-Reset, Run-Test/Idle, Pause-DR,
and Pause-IR). Upon receipt of a valid shadow protocol, this block performs the address matching required to
compute the shadow-protocol result.
TAP-state monitor
The TAP-state monitor is a synchronous finite-state machine that monitors the primary TAP state. The state
diagram is shown in Figure 5 and mirrors that specified by IEEE Standard 1149.1-1990. The TAP-state monitor
proceeds through its states based on the level of PTMS at the rising edge of PTCK. Each state is described both
in terms of its significance for ASP devices and for connected IEEE Std 1149.1-compliant devices (called
targets). However, the monitor state (primary TAP) can be different from that of disconnected scan chains
(secondary TAP).
Test-Logic-Reset
Run-Test /Idle
Select-DR-Scan
Capture-DR
Shift-DR
Exit1-DR
Pause-DR
Update-DR
PTMS = L
PTMS = L
PTMS = H
PTMS = L
PTMS = H
PTMS = H
PTMS = L
PTMS = H
PTMS = L
PTMS = L
PTMS = H
PTMS = L
Exit2-DR
Select-IR-Scan
Capture-IR
Shift-IR
Exit1-IR
Pause-IR
Update-IR
PTMS = L
PTMS = L
PTMS = H
PTMS = L
PTMS = H
PTMS = H
PTMS = L
PTMS = H
PTMS = L
Exit2-IR
PTMS = L
PTMS = H
PTMS = H
PTMS = H
PTMS = L
PTMS =H
PTMS = H
PTMS = H
PTMS = L
PTMS = H
PTMS = L
Figure 5. TAP-Monitor State Diagram


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