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SN74LVT8986 Datasheet(PDF) 8 Page - Texas Instruments |
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SN74LVT8986 Datasheet(HTML) 8 Page - Texas Instruments |
8 / 54 page www.ti.com SN54LVT8986 ,, SN74LVT8986 3.3-V LINKING ADDRESSABLE SCAN PORTS MULTIDROP-ADDRESSABLE IEEE STD 1149.1 (JTAG) TAP TRANSCEIVERS SCBS759E – OCTOBER 2002 – REVISED MAY 2007 FUNCTION TABLE 2 (Secondary TAP Configuration Using Bypass Inputs)(Continued) INPUTS OUTPUTS LINKING SHADOW STRST STCK PROTOCOL RESULT BYP5–0 PTRST STMS2 STMS1 STMS0 STDO2 STDO1 STDO0 PTDO CTDO 20 2–0 L L L L H H H H(1) PTCK PTMS STMS1(2) STMS0(2) PTDI Z Z STDI2 STDI2 L L L L H L H H PTCK PTMS STMS1(2) PTMS STDI0 Z PTDI STDI2 STDI2 L L L L L H H H PTCK PTMS PTMS STMS0(2) STDI1 PTDI Z STDI2 STDI2 L L L L L L H H PTCK PTMS PTMS PTMS STDI1 STDI0 PTDI STDI2 STDI2 xxx L L H H H H H H PTCK STMS2(3) STMS1(3) STMS0(3) Z Z Z Z CTDI L L H H H L H H PTCK STMS2(3) STMS1(3) PTMS Z Z PTDI Z STDI0 L L H H L H H H PTCK STMS2(3) PTMS STMS0(3) Z PTDI Z Z STDI1 L L H H L L H H PTCK STMS2(3) PTMS PTMS Z STDI0 PTDI Z STDI1 L L H L H H H H PTCK PTMS STMS1(3) STMS0(3) PTDI Z Z Z STDI2 L L H L H L H H PTCK PTMS STMS1(3) PTMS STDI0 Z PTDI Z STDI2 L L H L L H H H PTCK PTMS PTMS STMS0(3) STDI1 PTDI Z Z STDI2 L L H L L L H H PTCK PTMS PTMS PTMS STDI1 STDI0 PTDI Z STDI2 xxx L H L H H H H H PTCK STMS2(3) STMS1(3) STMS0(3) Z Z Z Z CTDI L H L H H L H H PTCK STMS2(3) STMS1(3) PTMS Z Z CTDI STDI0 STDI0 L H L H L H H H PTCK STMS2(3) PTMS STMS0(3) Z CTDI Z STDI1 STDI1 L H L H L L H H PTCK STMS2(3) PTMS PTMS Z STDI0 CTDI STDI1 STDI1 L H L L H H H H PTCK PTMS STMS1(3) STMS0(3) CTDI Z Z STDI2 STDI2 L H L L H L H H PTCK PTMS STMS1(3) PTMS STDI0 Z CTDI STDI2 STDI2 L H L L L H H H PTCK PTMS PTMS STMS0(3) STDI1 CTDI Z STDI2 STDI2 L H L L L L H H PTCK PTMS PTMS PTMS STDI1 STDI0 CTDI STDI2 STDI2 xxx L H H H H H H H PTCK STMS2(3) STMS1(3) STMS0(3) Z Z Z Z CTDI L H H H H L H H PTCK STMS2(3) STMS1(3) PTMS Z Z CTDI Z STDI0 L H H H L H H H PTCK STMS2(3) PTMS STMS0(3) Z CTDI Z Z STDI1 L H H H L L H H PTCK STMS2(3) PTMS PTMS Z STDI0 CTDI Z STDI1 L H H L H H H H PTCK PTMS STMS1(3) STMS0(3) CTDI Z Z Z STDI2 L H H L H L H H PTCK PTMS STMS1(3) PTMS STDI0 Z CTDI Z STDI2 L H H L L H H H PTCK PTMS PTMS STMS0(3) STDI1 CTDI Z Z STDI2 L H H L L L H H PTCK PTMS PTMS PTMS STDI1 STDI0 CTDI Z STDI2 xxx H X X X X X L L PTCK H H H Z Z Z Z H H X X X X X H RESET H PTCK H H H Z Z Z Z CTDI H X X X X X H MATCH H PTCK See Function Table 3 H X X X X X H NO MATCH H PTCK STMS2(3) STMS1(3) STMS0(3) Z Z Z Z CTDI H X X X X X H HARD ERROR(4) H PTCK STMS2(3) STMS1(3) STMS0(3) Z Z Z Z CTDI H X X X X X H DISCONNECT H PTCK STMS2(3) STMS1(3) STMS0(3) Z Z Z Z CTDI TEST H X X X X X H H PTCK PTMS(5) PTMS(5) PTMS(5) PTDI(5) PTDI(5) PTDI(5) Z CTDI SYNCHRONIZATION (1) In normal operation of IEEE Std 1149.1-compliant architectures, it is recommended that TMS be high prior to release of TRST. The BYP/TRST connect status ensures that this condition is met at STMS, regardless of the applied PTMS. Also, it is recommended that STMS be kept high for a minimum duration of five PTCK cycles following assertion of PTRST, either by maintaining PTRST low or by setting PTMS high. This ensures that devices with and without TRST inputs are moved to their Test-Logic-Reset TAP states. It is expected that, in normal application, this condition occurs only when BYP5 is fixed at the low state. In such a case, upon release of PTRST, the LASP immediately resumes the BYP connect status. (2) STMS level before steady-state conditions were established (3) STMS level before steady-state conditions were established (4) The linking shadow protocol is well defined. Some variations in the protocol are tolerated (see protocol errors). Those that are not tolerated produce the result HARD ERROR and cause disconnect, as indicated. (5) PTDI and PTMS are connected to STDO and STMS, respectively, only on those secondary TAPs whose TAP state is Pause-DR or Pause-IR while PTDO is high impedance. The result of linking shadow protocol on a secondary TAP whose state is Test-Logic-Reset or Run-Test-Idle is DISCONNECT. 8 Submit Documentation Feedback |
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