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Snap-Shot
Flex ROM III incorporates a feature called Address Capture (or SNAP-SHOT). Flex ROM III hardware
captures the value of the address lines during each valid target access. This data can be viewed with
Quickloader, RTSNAP16 or RTSNAP32. The capture register can be interrogated without using any
arbitration or worrying about interfering with the target.
While it does not maintain a history of every target cycle (like a logic analyzer or TRACE), it can provide
considerable insight into your target’s activities, once you understand exactly what it is giving to you. It is
NOT a simple polled view of the current state of the address lines. It holds the address of the last VALID
access to the emulator from the target. A quick glance at the current capture value can tell you if the
program has “left the road”, or has gotten stuck in a tight loop somewhere. If you have a map file handy,
you can even tell where it is stuck!
Have you ever forgotten to clear an interrupt flag and found yourself being endlessly interrupted? This
would be easy to spot with the capture register. Of course if you see addresses in the 0xC000 range and you
know your code stops at 0x8000, you instantly know that all is not well.
Some customers are using this feature to help reverse-engineer the data table formats of automotive
EPROMs, video game graphics, etc..
Control Lines
Flex ROM III provides 4 user control lines. These are TTL outputs on the feature connector that can be
individually set high or low. You can control these with RTCNTL16, RTCNTL32 or from within
Quickloader. The control lines are tri-stated whenever the target is powered down and will never drive
higher than the target power supply.
Status Lines
Flex ROM III provides 4 user input pins. These pins are sampled at the beginning of each valid target
access to the emulator. In addition, whenever a target access generates a trigger, the status pin levels at that
instant are held until the status register is read. The status register can be read through RTSNAP16,
RTSNAP32 or Quickloader.
FlexROM III User’s Manual
17
Copyright ? 2001, TechTools
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