參數(shù)資料
型號(hào)： SN54ABT8996FK
廠商： Texas Instruments, Inc.
英文描述： 10-BIT ADDRESSABLE SCAN PORTS MULTIDROP-ADDRESSABLE IEEE STD 1149.1 JTAG TAP TRANSCEIVERS
中文描述： 10位可尋址掃描港口多點(diǎn)尋址IEEE標(biāo)準(zhǔn)1149.1的JTAG技術(shù)咨詢收發(fā)器
文件頁數(shù)： 9/40頁
文件大?。?/td> 564K
代理商： SN54ABT8996FK
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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