TechTools
ACM-2X8
Active Cable Module - Dual 8 bit Target Interface
ACM-2X8 Application Note
The ACM-2X8 module allows the FlexROM III to emulate 2 memory devices simultaneously (with some limits.) In some
cases, this allows you to avoid buying a second emulator.
Capabilities:
–supports byte accesses (read or write to a each device individually)
–supports word accesses (read or write to BOTH devices simultaneously)
–supports single device emulation (up to ? the emulator’s memory capacity)
–supports individual control lines (CS,OE and WT) from each device.
–Suitable for ODD/EVEN 8bit devices on a 16bit bus
–Can be used for STACKED devices (eg: 2 – 32K devices in a 64K address space) on an 8 bit bus
–Allows emulation of CODE and DATA spaces in an 8051 without needing to over-lay them.
–Each interface can be configured for EPROM or FLASH pin-outs as well as for 28 or 32 pin cables.
Limitations:
–Does NOT support reading from one device while writing to the other (writes to BOTH)
–Requires common address lines, therefore:
– Can NOT support 2 devices in 2 separate targets
– Can NOT support 2 devices on separate buses (full Harvard architecture)
–Must use LOWER interface when emulating a SINGLE device
–If emulating devices of differing sizes, the LARGER device must be attached to the LOWER interface.
Summary:
The ACM-2X8 can support 2 devices as long as they share the same address lines and you do not enable one device for READING
while WRITING to the other. This covers most 16bit targets and many applications involving 2 devices in an 8 bit target.
If you need separate address lines or need to read from one device while writing to the other device, then you need 2 completely
independent emulators. Two FlexROM III’s can be daisy-chained together allowing you to connect both of them to a single printer
port. Further, you can control, status and download to each emulator individually or collectively with a single command line program
or our GUI software (QuickLoader.)
If you have any questions, we can be reached at:
support@tech-tools.com
FAX: 972-494-5814
Voice: 972-272-9392
(972) 272-9392, FAX: (972) 494-5814, sales@tech-tools.com, http://www.tech-tools.com
Copyright ? 2001 TechTools, P.O. Box 462101 Garland, Texas 75046-2101. FlexROM and Active Cable Module are trademarks of TechTools.
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