Tektronix Socket 7 TMS109A, Instruction Manual

Page: 28 / 113

Getting Started
1–12
TMS 109A Socket 7 Microprocessor Support
J580, ITP
connector
J260, ITP
reset signal
Figure 1–6: ITP and system reset pin locations on the probe adapter
Optional System Reset. The ITP circuitry on the Interposer board does not allow
external ITP debugging hardware to induce a system reset through the
DBRESET# signal on the ITP connector. If you need to enable this feature, you
must provide the connection to your system under test. Table 1–3 lists the signals
on J260 and Figure 1–6 shows the location.
Table 1–3: J260 jumper pin assignments
Jumper pin number Socket 7 signal name
1 OC_DBRESET# (Open
Collector, active low version
of DBRESET)
2 NC
3 DBRESET
The probe adapter contains pins that allow you to connect the DBRESET (or the
active low, open collector version OC_DBRESET#) signal to your system under
test. Table 1–3 shows the pins and signals you can connect to on J260 on the
probe adapter.
When using these signals, you need to make sure that the system under test is not
driving the OC_DBRESET# or DBRESET signal.
Check that the R/S#, TDI, TMS, TCLK, and TRST# signals are not driven. If
this is not possible, you may clip these five pins on one of the sacrificial sockets