Datasheet

SN54LVT8996, SN74LVT8996
3.3-V 10-BIT ADDRESSABLE SCAN PORTS
MULTIDROP-ADDRESSABLE IEEE STD 1149.1 (JTAG) TAP TRANSCEIVERS
SCBS686A – APRIL 1997 – REVISED DECEMBER 1999
16
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
PTDI
PTDO
CON
STDO
STMS
A9–A0
Don’t Care
†
Don’t Care Don’t Care
A0
P
A9
P
A0
P
A9
P
STMS = STMS
0
PTCK
STCK
PTMS Don’t Care
STDI
STMS = PTMS
STDO = PTDI
PTDO = STDI
BYP
PTRST
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 another valid
select protocol or produce protocol result HARD ERROR.
Don’t Care
Idle
Select Select Idle
Idle Select Select Idle
Figure 7. Shadow-Protocol Timing, Protocol Result = MATCH, Prior Connect Status = OFF