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120 www.xilinx.com PowerPC™ 405 Processor Block Reference Guide
1-800-255-7778 UG018 (v2.0) August 20, 2004
Chapter 2: Input/Output Interfaces
R
When the PPC405 JTAG logic is connected in series with the dedicated device JTAG logic,
only one JTAG chain is required on the printed circuit board. All JTAG logic is accessed
through the dedicated JTAG pins with this connection style.
Figure 2-45: PPC405 Core JTAG Logic Connected in Series with FPGA JTAG Logic Using the JTAGPPC
Primitive
PPC405 Core
FPGA
JTGC405TDI
C405JTGTDO
JTGC405TMS
JTGC405TCK
C405JTGTDOEN
JTGC405TRSTNEG
PPC405 Core
JTGC405TDI
C405JTGTDO
JTGC405TMS
JTGC405TCK
C405JTGTDOEN
JTGC405TRSTNEG
TDO 200Ω
v
cco
TDO
TCK
TMS
TDI
TDI
TMS
TCK
JTAGPPC Primitive
TDOPPC
TDIPPC
TMS
TCK
TDOTSPPC
TMS
TCK
UG018_74_040604