Re: gEDA-user: FPGA, uC, and JTAG
True, but the xsvf file is much bigger than a simple serial bitstream, and the xsvf player is bigger than a raw spi dump... ___ geda-user mailing list geda-user@moria.seul.org http://www.seul.org/cgi-bin/mailman/listinfo/geda-user
Re: gEDA-user: FPGA, uC, and JTAG
On Mon, Nov 08, 2010 at 05:24:21PM -0500, DJ Delorie wrote: True, but the xsvf file is much bigger than a simple serial bitstream, and the xsvf player is bigger than a raw spi dump... A JTAG bit-banger is not hard to write (I've written at least two of them), and a lot smaller than an xsvf file player. The one I use routinely now takes a small fraction of the 8K program space of an 8051 derivative (CY7C68013). The input file is the straight bitfile. Granted it will run a little slower than SPI, because unless you're exceptionally lucky it won't be hardware accelerated. It would be fun to take a crack at the bit speed limit on that 96 MHz processor, though. - Larry ___ geda-user mailing list geda-user@moria.seul.org http://www.seul.org/cgi-bin/mailman/listinfo/geda-user
Re: gEDA-user: FPGA, uC, and JTAG
A JTAG bit-banger is not hard to write (I've written at least two of them), and a lot smaller than an xsvf file player. Can you bit-bang a spartan 3 that way? ___ geda-user mailing list geda-user@moria.seul.org http://www.seul.org/cgi-bin/mailman/listinfo/geda-user
Re: gEDA-user: FPGA, uC, and JTAG
DJ - On Mon, Nov 08, 2010 at 05:55:04PM -0500, DJ Delorie wrote: A JTAG bit-banger is not hard to write (I've written at least two of them), and a lot smaller than an xsvf file player. Can you bit-bang a spartan 3 that way? Yes. Shameless plug (and almost back OT, since the board was laid out with pcb): http://recycle.lbl.gov/llrf4/ - Larry ___ geda-user mailing list geda-user@moria.seul.org http://www.seul.org/cgi-bin/mailman/listinfo/geda-user
Re: gEDA-user: FPGA, uC, and JTAG
Yes. Shameless plug (and almost back OT, since the board was laid out with pcb): http://recycle.lbl.gov/llrf4/ Specs for 3AN jtag-based bitstream loader? The 3AN xsvf is funny - it programs an SPI device into the 3AN fabric, then uses it to program the on-chip flash, then resets the chip! ___ geda-user mailing list geda-user@moria.seul.org http://www.seul.org/cgi-bin/mailman/listinfo/geda-user
