TMS320F datasheet(359/389 Pages) TI

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Emulation Design Considerations

C-24

You do not need to have devices on one target board stop devices on another

target board using the EMU0/1 signals (see the circuit in Figure C–14). In this

configuration, the global-stop capability is lost. It is important not to overload

EMU0/1 with more than 16 devices.

Figure C–14. EMU0/1 Configuration Without Global Stop

EMU0/1

To emulator

. . .

EMU0/1

. . .

Device

EMU0/1

. . .

Device

Target board m

Target board 1

Pullup

resistor

Pullup

resistor

Pullup

resistor

Note:

The open-collector driver and pullup resistor on EMU1 must be able to provide rise/fall times of less than 25 ns. Rise times

of more than 25 ns can cause the emulator to detect false edges during the RUNB command or when the external counter

selected from the debugger analysis menu is used. If this condition cannot be met, then the EMU0/1 signals from the

individual boards must be ANDed together (as shown in Figure C–14) to produce an EMU0/1 signal for the emulator.

C.8.4 Performing Diagnostic Applications

For systems that require built-in diagnostics, it is possible to connect the

emulation scan path directly to a TI ACT8990 test bus controller (TBC) instead

of the emulation header. The TBC is described in the Texas Instruments

Advanced Logic and Bus Interface Logic Data Book. Figure C–15 shows the

scan path connections of

n devices to the TBC.

TMS320F Datasheet(PDF) 359 Page - Texas Instruments