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On Mon, 9 Jun 1997, Tony Armitstead wrote: > > > > On Fri, 6 Jun 1997, Chris Johns wrote: > > > > > The driver for CPU32 and CPU32+ boils down to send the BDM commands over > > the BDM send/receive line. _If_ this is still a 10/8 pin connector with the > > same timing, you can use the many available PD parallel port BDM > > interfaces, and so probably the driver with only minor changes. But this > > needs very careful checking re. timing, etc. Especially the single > > stepping is very critical. However, it seems workable. > > > > Sorry chaps but the BDM interface on Coldfire is very different from > that on CPU32 - it also uses a 26 pin connector and not the CPU32 > 8 or 10 pins. However it is a much better BDM interface than CPU32 in > that it allows dynamic access to memory, on-chip breakpoints (better > than 68360) and nearly non-intrusive tracing of program execution. right, except that we don't need to be sorry > On the down side you cant do a simple BDM parallel cable interface > since the BDM serial transfer has to be synchronised to the CPU which > is just not possible without some extra hardware in the cable header. wrong, it can be done quite easily with less hardware than the PD-BDM interface for CPU32 You only need to synchronize the DSI, DSO, DSCLK, BKPT signals with the CPU_CLK which is kindly provided on the 26 pin BDM connector. So you can build a parallel port adapter just using one octal register or a GAL like P&E Microsystems do. This solution, however, does not allow tracing - it's just for BDM debugging. For tracing one would need an aditional logic analyzer due to the trace speed and the relative slowness of a PC. > I should point out that Noral who I work for makes BDM interfaces for > both CPU32 and Coldfire ... but I will say no more. and many others do > --------------------------------------------------- > Tony Armitstead tonya@noral.co.uk > Noral Micrologics Ltd. http://www.noral.com > Logic House, Gate St. ftp://ftp.noral.com > Blackburn, Lancs. Tel: 01254 682092 > England, UK. Fax: 01254 680847 > --------------------------------------------------- Kind regards, Rolf +-----------+----------------------------------------------------------+ | |||||| | Rolf Fiedler | | 6 6 \ | Electronic Design Engineer | | /_ ) | | Ferrari electronic GmbH | | > / | phone: +49 3328 4559 0 E-Mail: Rolf.Fiedler@Ferrari.DE | | | | | fax : +49 3328 4559 60 | +-----------+----------------------------------------------------------+