Re: [Xylo-SDR] RFC - Motherboard

["Leon Heller" <leon.heller@bulldoghome.com>]

----- Original Message ----- 
From: "Lyle Johnson" <kk7p@wavecable.com>
To: "Xylo-SDR Discussion" <xylo-sdr@lists.ae5k.us>
Sent: Wednesday, January 25, 2006 5:02 PM
Subject: Re: [Xylo-SDR] RFC - Motherboard


> > 1) Each board must be addressable from the Janus board via I2C or maybe
> > JTAG in order for the Janus to do the firmware download to each FPGA.
>
> I think the motherboard/bus should directly and distinctly support JTAG,
> in which some signals are in parallel, some are daisy-chained.  There
> may well be a mix of JTAG devices, not only FPGAs, on the various boards
> -- including daughter boards.

I feel it is best to have individual JTAG connectors on the boards, JTAG 
doesn't usually work with a mix of devices on the chain.

Leon