Instruction manual

8.5 DMA buffers
The DMA buffers are 32 longwords in size for each SCSI. Access to these buffers
is for diagnostic purposes; otherwise, driver software need not access them.
Write operations to these longwords ignore the byte mask: the entire longword is
written. These buffers are cleared when the DMA engine is reset.
The buffers’ location, format, and contents are:
Start
Address End Address Size Register R/W
400/500/600/700/800/900 Models
1.C00C.0000 1.C004.007F 128 B SCSI[0] DMA buffer R/W
1.C00C.0100 1.C004.017F 128 B SCSI[1] DMA buffer R/W
300 Models
1.800C.0000 1.8004.007F 128 B SCSI[0] DMA buffer R/W
1.800C.0100 1.8004.017F 128 B SCSI[1] DMA buffer R/W
8–14 TURBOchannel Dual SCSI ASIC