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| SCANSTA112_14 Datasheet, PDF (3/23 Pages) Texas Instruments – 7-Port Multidrop IEEE 1149.1 (JTAG) Multiplexer | |||
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SCANSTA112
www.ti.com
SNLS161I â DECEMBER 2002 â REVISED APRIL 2013
The 'STA112 selection controller provides the functionality that allows the 1149.1 protocol to be used in a multi-
drop environment. It primarily compares the address input to the slot identification and enables the 'STA112 for
subsequent scan operations.
The Local Scan Port Network (LSPN) contains multiplexing logic used to select different port configurations. The
LSPN control block contains the Local Scan Port Controllers (LSPC) for each Local Scan Port (LSP0, LSP1 ...
LSPn). This control block receives input from the 'STA112 instruction register, mode registers, and the TAP
controller. Each local port contains all four boundary scan signals needed to interface with the local TAPs plus
the optional Test Reset signal (TRST).
The TDI/TDO Crossover Master/Slave logic is used to define the bidirectional B0 and B1 ports in a Master/Slave
configuration.
Block Diagram
OE
A0B0, A1B0
Y0B0, Y1B0
TDOB0
TCKB0
TMSB0
TRSTB0
S0-7
ADDMASK
TDIB0
TRISTB0
RESET
LSPSel0-6
MPSelB1/B0
SB/S
TRANS
TLR_TRST
TLR_TRST6
TDI/TDO
Crossover
Master/
Slave
Logic
Selection
Control
Instruction
MstrPortSel
Boundary
SGPIO
32-bit Counter
MultiCast
LFSR
ByPass
ID
Control
Mode0-3
PortEnable
TAP
Controller
TDI/TDO
Crossover
Master/
Slave
Logic
Local
Scan
Port
Network
Mode0-3
LSP
Controller
/2
Figure 3. SCANSTA112 Block Diagram
TDIB1, A0B1 A1B1
TMSB1 TCKB1 TRSTB1
TDOB1 TRISTB1Y0B1 Y1B1
TDO01 TCK01 TMS01
TRST01 Y001 Y101 TRIST01
TDI01 A001 A101
TDO02-03 TCK02_03 TMS02-03
TRST02-03 TRIST02-03
TDI02-03
TDO04-06 TCK04-06
TMS04-06 TRST04-06
TDI04-06
Copyright © 2002â2013, Texas Instruments Incorporated
Product Folder Links: SCANSTA112
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