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SN54ABT8996, SN74ABT8996
10-BIT ADDRESSABLE SCAN PORTS
MULTIDROP-ADDRESSABLE IEEE STD 1149.1 (JTAG) TAP TRANSCEIVERS
SCBS489C – AUGUST 1994 – REVISED APRIL 1999
3
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
FUNCTION TABLE
INPUTS
SHADOW-PROTOCOL
OUTPUTS
PRIMARY-TO-SECONDARY
BYP
PTRST
RESULT†
STRST
STCK
STMS
STDO
PTDO
CON
CONNECT STATUS
L
L
L
PTCK
H‡
PTDI
STDI
L
BYP/TRST‡
L
H—
H
PTCK
PTMS
PTDI
STDI
L
BYP
H
L—
L
PTCK
H
Z
Z
H
TRST
H
H
RESET
H
PTCK
H
Z
Z
H
RESET
H
H
MATCH
H
PTCK
PTMS
PTDI
STDI
L
ON
H
H
NO MATCH
H
PTCK
STMS0§
Z
Z
H
OFF
H
H
HARD ERROR¶
H
PTCK
STMS0§
Z
Z
H
OFF
H
H
DISCONNECT
H
PTCK
STMS0§
Z
Z
H
OFF
H
H
TEST SYNCHRONIZATION
H
PTCK
PTMS
PTDI
Z
L
MULTICAST
† Shadow protocols are received serially via PTCK and PTDI and acknowledged serially via PTCK and PTDO under certain conditions in which
PTMS is static low or static high (see shadow protocol). The result shown here follows any required acknowledgement.
‡ 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 5 PTCK cycles following assertion of PTRST, either by maintaining PTRST low or by setting PTMS high. This ensures
that ICs both with and without TRST inputs are moved to their Test-Logic-Reset TAP states. It is expected that in normal application, this condition
will only occur when BYP is fixed at the low state. In such case, upon release of PTRST, the ASP immediately resumes the BYP connect status.
§ STMS level before indicated steady-state conditions were established
¶ The shadow protocol is well defined. Some variations in the protocol are tolerated (see protocol errors). Those that are not tolerated are
considered hard errors and cause disconnect as indicated.
functional block diagram
CON
Shadow-Protocol
Receive
1D
PTCK
PTRST
VCC
STCK
STRST
STMS
PTMS
VCC
PTDI
VCC
STDO
STDI
VCC
PTDO
BYP
VCC
A9–A0
VCC
Connect Control
Shadow-Protocol
Transmit
C1
S
9
12
10
11
17
6
16
13
15
14
8
18
Pin numbers shown are for the DW, JT, and PW packages.
20–24,
1–5


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