Configure Spartan-3E w SD-Card?

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think you missed something.

FPGA's can get configured from DATAFLASH mounted in SDCARD plastic (atmel sells those!) and sure mmc-sd can be used in spi or sd mode, but there is extra circuitry required, either mcu or cpld

Antti

I think my point was to accomplish this without adding an extra chip.. Using a MCU/CPLD it would ofcourse work.

well dont think it can be done, would be too good to be true ;)

Antti

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SPI bus means to have one Master and one Slave.

SD card cannot be master, you need to have a Master to get the data from! FPGA CONFIG RAM cannot be master, you need to have a master to write the data to the FPGA RAM !

For programming FPGA, you need a master getting the data from SD and writing to FPGA RAM.

Larry,

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SD card doesnt need to be master, the issue is that it is not compatible to the FPGA command used in master serial mode, etc.

with MMC card (not SD!) a RECONFIGURATION from MMC card could be possible, if

1 S3E is configured from SPI flash 2 S3E puts SPI flash into DEEP powerdown or any other mode that prevents configuration in case of PROG toggle 3 S3E prepares MMC card to enter STREAMING READ (not available on SD cards) mode and pre shifts instruction and address 4 S3E pulses its own PROG pin 5 S3E would be configured from a file located on the MMC card

so while INITIAL load from card is no way possible a repeated secondary configuration can be possible

S3E should be connected properly SPI flash and MMC card pins in parallel, MMC card should be operating in non SPI mode

Antti

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Do you mean a SD Card could be Master ?????

- Larry

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no no, but when FPGA is configured as MASTER SERIAL then FPGA would generate CCLK if CCLK -> SD_CLK

and MMC preinited for streaming read then FPGA would clock out its bitstream from MMC card

Antti