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Table 5-2. IEEE 1149.7 Feature Subset (continued)
Device Support Through
IEEE 1149.7 Feature Comment
cJTAG
JScan0 Yes Parallel mode
JScan1 Yes Parallel with firewall
JScan2 Yes Parallel with superbypass select
JScan3 Yes Parallel with register select
MScan No Multidevice mode, supports stalls
OScan0 Yes Supports stalls
OScan1 Yes Nonstall mode
OScan2 Yes Bidirectional transfers, pipelined
Scan formats OScan3 Yes Host to target only, pipelined
OScan4 Yes Supports stalls
OScan5 Yes Pipelined
OScan6 Yes Bidirectional transfers, pipelined
OScan7 Yes Host to target only, pipelined
SScan0 No Segmented scan
SScan1 No Segmented scan, supports stalls
SScan2 No Segmented scan
SScan3 No Segmented scan, supports stalls
Table 5-3. OScan Scan Packet Contents
Scan Format Non-Shift States Shift States
OScan0 nTDI TMS RDY TDO nTDI TMS RDY TDO
OScan1 nTDI TMS TDO nTDI TMS TDO
OScan2 TMS nTDI TMS TDO
OScan3 TMS nTDI TMS
OScan4 nTDI TMS RDY TDO nTDI RDY TDO
OScan5 nTDI TMS TDO nTDI TDO
OScan6 TMS nTDI TMS
(1)
TDO
OScan7 TMS nTDI
(1)
TMS is present for the first packet of the shift.
393
SWCU117A–February 2015–Revised March 2015 JTAG Interface
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