weber@brand.usc.edu (Allan G. Weber) (06/24/88)
Does anybody know how, in software, to get a DEC DRV11-W DMA interface to abort a transfer that it's trying to complete? I'm running some image processing peripherals off DRV11-Ws in a MicroVAX-II/Ultrix 2.2. Occasionally, some device gets locked up and doesn't transfer as much data as the DRV11-W is expecting. The DRV11-W then sits there with the READY bit in the CSR stuck low waiting for more data and won't accept any new transfers. If I pull the ATTN line high coming from the device, it aborts the transfer and everything is fine. However I would also like a way to let the software abort the transfer with an ioctl or something like that. Perhaps setting the word count register to zero, or doing something with the maintanence bit will do the trick. If anybody knows the preferred way to do this, I would appreciate hearing about it. Thanks. Allan Weber USC Signal and Image Processing Institute Arpa: weber%brand.usc.edu@oberon.usc.edu uucp: ...!sdcrdcf!usc-oberon!brand!weber