On 6/24/2014 5:47 AM, 吳政昌 wrote: > I'm designing a board for CNC based on Beaglebone Black. > > Spec: like BeagleBone Black but > * 2 RJ45 > * 1 FPGA for stepper > * Boot into EtherCAT master mode but can changed to EtherCAT slave mode > * 2 Connectors, 1 of them is compatible to Raspberry Pi's P1 connector
It sounds like a great board! A few comments: * I recommend making the hardware encoder pins available if at all possible, since you seem to be targeting industrial control. * The PRU is required to run EtherCAT slave mode (along with the libraries from TI), which means the PRU likely will not be able to do step/dir generation in EtherCAT mode. You have an FPGA, but I don't think the ICE40 will have enough logic to run the standard hostmot2 VHDL code. * I see mention of a PC104 bus, which would be great, but this would have to tie to the GPMC controller, which conflicts with the eMMC controller pins. -- Charles Steinkuehler [email protected]
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