A jtag driver for mesaflash would be a nice way
to program the 7i90hd, since setting up an epp
machine just for loading the bitstream is a real pain.
The RPi gpio should be able to do jtag without
trouble, even if it is a little slow.
-- Ralph
________________________________________
From: Peter C. Wallace [p...@mesanet.com]
Sent: Thursday, January 7, 2021 3:47 PM
To: Enhanced Machine Controller (EMC)
Subject: Re: [Emc-users] Rpi 3b+ to 7i90hd
Yep, you need to have SPI firmware loaded in the 7I90HD
default 7I90HD firmware is EPP, so a device with a EPP
interface is needed to load the SPI configuration
I would suggest loading the SPI interface into the
secondary flash leaving the primary as EPP for a fallback
That is, power the 7I90 with the flash jumper in the "P" position
them move the jumper to "S" before loadin the SPI firmware
>
> "Linux and Windows utility programs mesaflash and mesaflash.exe are provided
> to
> write configuration files to the 7I90HD EEPROM via the RS-422 interface and
> LBP16. The
> linux utility can also write configuration files via the EPP interface. These
> files depend on
> a simple SPI interface built into both the standard user FPGA bitfiles and
> the fallback
> bitfile."
Well there are 2 SPI interfaces, the HM2 compatible host interface (which needs
specific SPI firmware) and the SPI Flash memory interface (which is in HM2
memory space and allows access to the SPI flash chip)
>
> I can tack on a pullup to SDO. I have put four
> scope probes on the four signals, and see data
> when interrogating the 7c81, but not the 7i90hd.
> The clock from the pi is correct.
>
> Thanks again.
> -- Ralph
> ________________________________________
> From: Peter C. Wallace [p...@mesanet.com]
> Sent: Thursday, January 7, 2021 3:18 PM
> To: Enhanced Machine Controller (EMC)
> Subject: Re: [Emc-users] Rpi 3b+ to 7i90hd
>
>
> Looks right
>
> 2 layer should be fine as long as the ground is solid (wide)
> between the 7I90 and the RPI (and lo longer than a couple of
> inches
>
> You might try adding a pullup to SDO (7I90 15) to see if you read
> 0xFFFFFFFF which would indicate the the 7I90 is not driving SDO
>
> Sure you have a SPI config in the 7I90?
>
>
> Peter Wallace
> Mesa Electronics
>
> (\__/)
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Mesa Electronics
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