24 FAQ’s for Actel’s Antifuse FPGA Programming
62. Can I use the same programming file with devices of different
technologies?
Ans. If you generate a programming file with one technology, (for example, a1020A), but actually
program a different technology of the same device (for example, an RH1020), there are risks that this
operation will not be successful. Because of the differences in separate revisions of devices, there are
variations in programming. They include the programming voltage level and length of time allowed before
the device "times out," which might result in a programming failure. In addition, there are AC timing
differences from one technology to the next. If proper simulation is not performed, the new device
technology may not exhibit the same AC characteristics as the original. To avoid these issues, Actel
recommends using the *.afm files generated specifically for the device you want to program.
User Action
Required: Whenever you change to a new device, you must update the design files to the targeted
device type prior to programming the new device. This ensures that the device receives the proper
programming steps and settings.
Recommended: Actel recommends that you re-simulate your designs for the new device type to ensure
that all timing requirements are met.
Warranty: Actel does not provide any warranty for devices that are programmed with an incorrect device
type file. Programming failures resulting from the device being programmed with the incorrect file types
will not be accepted for replacement unless approved by Actel Technical Support.
63. Can I retarget to a compatible device with just an *.afm file?
Ans. No, the *.afm file for one technology cannot be used to program a device of another technology-
even if the parts are compatible. In general, there is no way to regenerate any design database
information from just the *.afm file.
64. Can I use ACT 2 *.afm files to program 1200XL devices?
Ans. While it is true that ACT 2 and 1200XL devices are pin-to-pin compatible, their *.afm files are not the
same. The primary difference between ACT 2 devices and 1200XL devices is the length of the register
used for programming; 1200XL devices have a much longer register chain.
To program a 1200XL device, you must regenerate the *.afm file. Actel also recommends that you rerun
timing and simulation since the 1200XL devices are faster.
Note: You may use ACT 2 *.afm files to program “A” rev ACT 2 devices (that is, 1280 *.afm file can
program 1280A device) since the register chains are of the same length.
(24 Seiten)
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