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Printer port set to an incompatible mode
If your printer port is configurable through BIOS settings. Check that these are set to STANDARD, AT,
NIBBLE or COMPATIBLE mode. Avoid ECP, EPP, PS2, HIGH-SPEED or similar settings.
Failed to use a /W16 parameter to load to a 16 bit emulator.
The loader treats a 16 bit emulators like two daisy-chained 8 bit emulators. If you fail to specify the /W16
parameter, the loader will load the entire file into the upper 8 bits ONLY. If the file is greater than ? of the
emulator’s capacity, it will fail verify. Note that if the file is relatively small, it will pass verify, but still be
wrong.
Verifies, but target does not run
Target not being reset
If the wrong reset output is being used or it is connected to the wrong spot on the target, it may not be
resetting the target during the download. We would get a good download, but the target was fetching
garbage during the transfer. Some processors will HALT, others will simply execute the random garbage
they received. In either event, the processor will not “know” to start over and execute the new code.
Try removing the reset line, turning off the target power for 10 seconds and then turning the power back on.
If the target now comes up and runs, the reset signal connection was wrong. While you could do this after
each load, we highly recommend correcting the reset problem to make resets automatic and to prevent the
target from running garbage during the download.
Emulator device size set wrong.
The device SIZE configuration affects only the TARGET’S view of the emulator. The file will download
and verify correctly as long as the emulator is large enough to hold the file. If the size is set too small, the
target will not be able to access all of the file image. For example, if the file is 60,000 bytes long, it would
load into an ER2-512 and verify properly, regardless of the jumper settings. However if the emulator is
configured to emulate a 27256, the target would see only the first 32Kbytes mirrored into both halves of the
64KByte space. This is exactly what would happen if you burned the first 32Kbytes into a 27256 and
plugged it into the same socket.
File Too Large
If the file size exceeds the configured device size, the target will not be able to access the entire file. Note
that the file may still verify correctly, as long as it does not exceed the emulator’s maximum capacity. If the
emulator is configured correctly and the file is larger than the device setting, your code has just outgrown its
space. If you are emulating the maximum size device the target is wired to accept, you will have to reduce
the code size. If the target has some unused space contiguous to the current EPROM space, you may be
able to modify the target board to accept a larger EPROM. This would typically involve adding another
address line to the socket and possibly modifying the EPROM chip select decodes. Of course you would
need to re-configure the emulator for the larger device as well (if it has room to spare).
Wrong PLCC or other adapters used.
Any adapter used between the target cable and the target socket itself has the potential of introducing errors.
In particular, PLCC footprints vary by EPROM size, model and manufacturer. In general, small EPROMs
(<1Mbit) generally have one pin out and larger EPROMs have a different pin out. Most FLASH chips are
Econo ROM II User’s Manual
9
Copyright ? 1996, TechTools
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相关PDF资料
ER3-8M EMULATOR EPROM ECONOROM III 8MEG
ESF2424 FRAME SWING ECLIPSE 19.25X19"
ESF3024 FRAME SWING ECLIPSE 24.5X19"
ESF3624 FRAME SWING ECLIPSE 29.75X19"
ESP1212 PANEL STEEL SWING 12X12" WHT
ESP1612 PANEL STEEL SWING 16X12" WHT
ESP1616 PANEL STEEL SWING 16X16" WHT
ESP1620 PANEL STEEL SWING 16X20" WHT
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