[FRAM71] Pre-Production Batch

[Dave Frederickson]

(02-10-2015 05:44 PM)Hans Brueggemann Wrote:  c. FRAM71 does not use the internal FPGA-RAM for a simple reason: that RAM is volatile and hence would screw FRAM71's memory configuration as soon as your HP-71B loses power

According to the IGLOO nano data sheet, all versions of the FPGA contain 1kbit of FlashROM User Nonvolatile Memory. It should be possible to map the few registers in the 0x20000 segment into the FPGA. That would give us another 32k block.

Regarding the 0x00000-0x1FFFF reserved block. Presently, those nibbles in the configuration string are set to zero, but why couldn't they be configured the same way as the Chips? If the config nibbles are zero then the memory get treated as SYSRAM and if non-zero then it gets treated as Chips.

Edit: Okay, I see that the FlashROM is only programmable via JTAG.

Dave