Instruction manual

8.2.5 SCSI[x] DMA Unaligned Data[0] (DUDx0)—1.8004.1x08/1.C004.1x08
The DUDx0 is the buffer for the first 1-3 bytes of unaligned data for DMA writes
to memory. It must be read if the DMA address<1:0> does not contain 00. The
bytes appear in the correct byte locations. When set to 1, mask bits 0-3 indicate
that the corresponding byte contains valid data. The least significant bit is
always 0.
The register’s format and contents are:
07 0008151624 2331
MR−0101−93RAGS
BYTE[11] BYTE[10] BYTE[01] MASK
0304
0000
Bit Access Reset Description
0 R 0 Mask bit indicating Byte[01] valid
1 R 0 Mask bit indicating Byte[10] valid
2 R 0 Mask bit indicating Byte[11] valid
7:3 R 0 Reserved, read as zero
15:8 R 0 Byte[01]
23:16 R 0 Byte[10]
31:24 R 0 Byte[11]
8–10 TURBOchannel Dual SCSI ASIC