wishbone bus on netduino plus
Posted 16 March 2012 - 02:25 PM
Posted 18 March 2012 - 01:47 AM
i would like to implement a wishbone bus interface between my netduino plus and an FPGA.
I can't speak to your CLR question, but isn't Wishbone intended to be used between components on the FPGA? When it comes to bridging the gap between the FPGA and the Netduino, wouldn't you use i2c or SPI? There is a Wishbone compliant implementation of i2c (and probably an SPI one too) at www.OpenCores.org.
Sorry if this reply isn't a direct response to your question, but I'm wondering if you could comment.
Posted 19 March 2012 - 01:37 PM
Posted 19 March 2012 - 02:53 PM
There are two things worth considering: 1) according to the datasheet the maximum GPIO frequency is 25 MHz (resp. 30 MHz) for 40pF (resp. 20 pF) load and 2) there are only 4 consecutive bits of a port broken out on the Netduino (PB19 - PB22, the other four PB27 - PB30 have max frequency 12.5 MHz). You'd need to recompile the whole firmware to add Wishbone support.
BUT I2C and SPI are "relatively" slow serial bus as Wishbone is a parallel bus, so maybe it can be fast.
Posted 19 March 2012 - 04:16 PM
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