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SN74ABT8996DW Datasheet(PDF) 9 Page - Texas Instruments |
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SN74ABT8996DW Datasheet(HTML) 9 Page - Texas Instruments |
9 / 40 page 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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