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Altera_Forum
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14 years ago

Transfer RAM content to computer

Hi, I use the Altera board DE2-115 with a cyclone iv chip to produce data. I can store this data onto the RAM of the board. The next step I can't handle is to transfer this data from the RAM ...
Altera_Forum's avatar
Altera_Forum
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14 years ago

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Still it will take the whole night to read out the RAM. Therefore something faster would be better.

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Your options on the DE115 are;

1) JTAG USB; max speed is about 6MHz/10 per byte, i.e., 0.6MB/s

2) USB; the ISP1362 is a full-speed device, so 12Mbps/8 = 1.5MB/s at 100% USB bus bandwidth (unlikely you'd ever get that).

3) GbE; 1000Mbps/8 = 125MB/s at 100% utilitization ... I think 80MB/s is probably about the max you'd get.

4) Use an FTDI FT2232H on the GPIO connector; 25MB/s (according to their data sheet).

Use (3) and you can transfer your RAM contents in a few seconds.

Cheers,

Dave