How about using one of FTDI's USB interface chips? The FT232 provides a USB to serial port interface and the FT245 does a USB to parallel interface. Both have far size FIFO's built in. FTDI's web site http://www.ftdichip.com has a lot of support software for the OS side too. Either way, the control micro on the JTAG could easily stay an MSP430.
Anyway, just a thought. -Bill Knight R O SoftWare On Fri, 14 Mar 2003 16:58:22 +0100, Roland Zitzke wrote: >> Steve mentioned USB - I like it. I also thought about improvements on >>> FEET hardware that could implement USB connection to programmer board: >> 1. Can anyone give me some suggestions on a starting point to design >> Flash Emulation Tool for USB port to JTAG connector? I am interested >> in designing the hardware. I would like to know if the USB idea is >> worth-while. >I wonder if it realy is desirable to have a USB to jtag interface. >There'll always be the Windows USB stack (or linux) between our application >and the jtag pins which means that - according to my experience - it takes >about two miliseconds to get a message through. >I am not talking about speed but about the time from initiating a message to >when it reaches the USB controller. >The easiest way to get a USB compliant slave is probably to use a Cypress >EZUSB or a TI TUSB Micro - they come with a built-in USB stack. The TI's >documentation is awfull though. >> 2. About JTAG connector; I thought about switching from old fashion >> 0.1" pitch ribbon cable connectors to J45 10-pin or 8-pin network >> connector and fine pitch ribbon cable or oval cable. Is it worth to >> consider this? Would anyone be interested in such >> improvements/changes? >Keep in mind that there are a lot of devices compatible to the existing jtag >devices. Such approach would bare the risk of having to solve compatibility >issues in the end. >/Roland >------------------------------------------------------- >This SF.net email is sponsored by:Crypto Challenge is now open! >Get cracking and register here for some mind boggling fun and >the chance of winning an Apple iPod: >http://ads.sourceforge.net/cgi-bin/redirect.pl?thaw0031en >_______________________________________________ >Mspgcc-users mailing list >Mspgcc-users@lists.sourceforge.net >https://lists.sourceforge.net/lists/listinfo/mspgcc-users
