VXI Technology, Inc.
FLASH Memory Programming Commands
The following commands can be used to change the content of the FLASH memory. The FLASH memory stores the board’s software (executed by the microprocessor) and firmware (what programs the two FPGAs on the board). To prevent accidental writings of the FLASH, a sequence of three commands is necessary to perform a write to it.
To change the microprocessor software, the new file that needs to be programmed into FLASH is uploaded at offset address 0x000000. Then, to change the software, the following three commands must be issued in this particular order. Issuing them in a different order will not produce any results:
0x5501, 0xAA01, 0x5501
After issuing each of the above commands, the user must wait until the command is executed before issuing the next one. When the second 0x5501 command is done, it means the new data has been moved into FLASH memory.
To change the firmware for the first FPGA (U1), the new file that needs to be programmed into FLASH is uploaded at offset address 0x000000. Then, the following three commands must be issued in this particular order. Issuing them in a different order will not produce any results:
0x5502, 0xAA02, 0x5502
After issuing each of the above commands, the user must wait until the command is executed before issuing the next one. When the second 0x5502 command is done, it means the new data has been moved into FLASH memory.
To change the firmware for the second FPGA (U20), the new file that needs to be programmed into FLASH is uploaded at offset address 0x000000. Then the following three commands must be issued in this particular order. Issuing them in a different order will not produce any results:
0x5503, 0xAA03, 0x5503
After issuing each of the above commands, the user must wait until the command is executed before issuing the next one. When the second 0x5503 command is done, it means the new data has been moved into FLASH memory.
To change the firmware for the third FPGA (U37), the new file that needs to be programmed into FLASH is uploaded at offset address 0x000000. Then the following three commands must be issued in this particular order. Issuing them in a different order will not produce any results:
0x5504, 0xAA04, 0x5504
After issuing each of the above commands, the user must wait until the command is executed before issuing the next one. When the second 0x5503 command is done, it means the new data has been moved into FLASH memory.
Changes become effective the next time the module powers up.
WARNING: ANY COMMANDS NOT LISTED HERE ARE RESERVED FOR FACTORY USE AND SHOULD NOT BE USED UNDER ANY CIRCUMSTANCES.
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