SN54ABT8996_15 Datasheet, PDF (15/46 Pages) Texas Instruments – 10-BIT ADDRESSABLE SCAN PORTS MULTIDROP-ADDRESSABLE IEEE STD 1149.1 (JTAG) TAP TRANSCEIVERS

SN54ABT8996, SN74ABT8996
10-BIT ADDRESSABLE SCAN PORTS
MULTIDROP-ADDRESSABLE IEEE STD 1149.1 (JTAG) TAP TRANSCEIVERS
SCBS489C – AUGUST 1994 – REVISED APRIL 1999
PTCK
A9–A0
Don’t Care
Don’t Care
BYP
PTDI idle
select ^{A0P A9P} select
idle
Don’t Care†
PTMS
Don’t Care
PTRST
STDI
Don’t Care
CON
PTDO
idle
select ^{A0P A9P} select
idle
PTDO = STDI
STCK
STDO
STDO = PTDI
STMS
STMS = STMS0
STMS = PTMS
STRST
Select Protocol
Acknowledge Protocol
ON
† _{The instantaneous value of PTDI during protocol acknowledge is “don’t care” as long as the cumulative effect does not represent a protocol}
hard-error or another valid select protocol.
Figure 7. Shadow-Protocol Timing, Protocol Result = MATCH, Prior Connect Status = OFF
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