Tbc Emulation Connections For N Jtag Scan Paths - Texas Instruments TMS320C6000 Reference Manual

Figure 13.

TBC Emulation Connections for n JTAG Scan Paths

TBC
TMS2/EVNT0
TMS3/EVNT1
TMS4/EVNT2
TMS5/EVNT3
† Voltage translators should be used between the TBC (5V) and the C6000 DSP (3V).
In the system design shown in Figure 13, the TBC emulation signals TCKI,
TDO, TMS0, TMS2/EVNT0, TMS3/EVNT1, TMS5/EVNT3, TCKO, and TDI0
are used, and TMS1, TMS4/EVNT2, and TDI1 are not connected. The target
devices' EMU0 and EMU1 signals are connected to V
tors and tied to the TBC's TMS2/EVNT0 and TMS3/EVNT1 pins, respectively.
The TBC's TCKI pin is connected to a clock generator. The TCK signal for the
main JTAG scan path is driven by the TBC's TCKO pin.
On the TBC, the TMS0 pin drives the TMS pins on each device on the main
JTAG scan path. TDO on the TBC connects to TDI on the first device on the
main JTAG scan path. TDI0 on the TBC is connected to the TDO signal of the
last device on the main JTAG scan path. Within the main JTAG scan path, the
TDI signal of a device is connected to the TDO signal of the device before it.
TRST for the devices can be generated either by inverting the TBC's
TMS5/EVNT3 signal for software control or by logic on the board itself.
SPRU641
V CC
Clock
TCKI
TDO
TMS0
TMS1
TCKO
TDI0
TDI1
Emulation Design Considerations
†
JTAG0
TDI
TMS
EMU0
EMU1
TRST
TCK
TDO
JTAGn
TDI
TMS
EMU0
EMU1
TRST
TCK
TDO
through pullup resis-
CC
Designing for JTAG Emulation 25