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FAQs
Can I use FlexROM III on a 3V target?
YES, but you will need an external power supply. Connect 5VDC at 300ma or greater to the emulator’s
external power connector. External power supplies are available form TechTools.
What is the lowest target voltage supported?
FlexROM III was designed to support 3.0V to 5.0V targets. However, it CAN support lower voltage targets
within limits. Three things set the lower limit; Logic INPUT thresholds, Vout HIGH from the emulator,
and the target isolation threshold.
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Logic INPUT Thresholds. FlexROM III will accept a Vin HIGH minimum of 1.5Volts. Your
target MUST produce at least 1.5V for logic HIGHs. Most logic down to about 2V can meet this
requirement.
Vout HIGH levels: Your target must tolerate logic HIGHs from the emulator data lines of
3.2Volts. This depends entirely on your target design.
Target Isolation Threshold: To allow safe target power cycling,, FlexROM III constantly monitors
the target’s voltage. When it detects that the target voltage has dropped below a fixed threshold, it
assumes the target is powering down so it turns off its output buffers to avoid leaking current into
the target. It also asserts reset and turns the STATUS LED RED. If the emulator did NOT
provide this safety feature, it could start reverse biasing devices on the target, potentially causing
damage. Even if the target were not damaged, the current leakage could prevent the target from
properly powering down. This could prevent the reset circuitry from operating. This cut-off
threshold is approximate 2.7 to 2.8V.
Bottom line: You CAN emulate lower voltage targets as long as you can tolerate 3.2V on your data bus,
your target provides logic highs of at least 1.5V and our low voltage cut-off circuit does not kick-in.
How accurate are FlexROM III’s voltage readings?
The readings are typically accurate to +- 250mv.
Can FlexROM III emulate FLASH devices?
The emulator supports FLASH pin-outs and accepts target writes. However, it does NOT emulate any of
the special FLASH algorithms. For example, it does not support the special sequences that lock/unlock
pages of memory or any kind of busy indicators. It operates at full speed and looks like SRAM to the
target.
FlexROM III User’s Manual
32
Copyright ? 2001, TechTools
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