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Plug the emulator into your target
Turn the target power off. Plug the supplied target interface cable into the target’s EPROM socket. Be
careful to align the PIN 1 end of the cable (designated with a stripe) with the PIN 1 end of the target’s
socket (usually designated with a notch, a dot or a ‘1’).
PLUGGING THE CABLE IN BACKWARDS WILL
DAMAGE Econo ROM II!
Smaller Econo ROM IIs ship with a 28 pin DIP cable. Larger Econo ROM IIs include both 28pin and 32pin
DIP cables. Use the 28pin cable if you are emulating a 28pin EPROM; the 32pin cable if emulating a 32pin
EPROM. 16 bit Econo ROM IIs include a 40 pin cable for 16 bit DIP devices. If you are emulating PLCC
type devices, you will need to purchase a DIP to PLCC adapter. These are available from TechTools as
well as all popular adapter manufacturers.
Connect RESET
The RESET line must be connected to enable proper target operation. The reset signal is automatically
asserted during each emulator access. This prevents the target from “running stupid” while we change its
code space. The reset signal is released at the completion of the transfer, allowing the target to restart with
the new code image.
Econo ROM II provides two reset outputs. RESET is an open emitter, ACTIVE HIGH output. /RESET is
an open collector ACTIVE LOW output. Connect the appropriate output to your target’s RESET circuitry.
Econo ROM’s reset signal should be connected to the target’s reset circuitry at the most “upstream” point
available. This is usually an RC combination that senses the target’s power up or a manual reset switch.
Sometimes this circuitry is connected directly to the CPU reset input. In other targets, it will be connected
to the input to a reset chip, power management chip, a watchdog timer chip or a Schmitt trigger gate.
DO NOT CONNECT Econo ROM II’s RESET
OUTPUT ACROSS A TOTEM-POLE OR BIPOLAR
GATE. THIS MAY RESULT IN DAMAGE TO
Econo ROM II OR THE TARGET.
Call our technical support if you are unsure about which output to use or where to connect to your target.
Econo ROM II User’s Manual
3
Copyright ? 1996, TechTools
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