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Chapter 4
SCSI and DMA
Registers
This chapter contains descriptions of the SYM53C040 SCSI and DMA
registers. The SFF-8067 registers, Two-Wire Serial registers,
Miscellaneous registers, and System registers are described in
Chapter 5
through
Chapter
are programmed to a binary one, while the terms "reset" or "clear" are
used to refer to bits that are programmed to binary zero. Any bits marked
as reserved should always be written to zero; mask all information read
from them. Reserved bit functions may change at any time. Unless
otherwise indicated, all bits in registers are active high; that is, the feature
is enabled by setting the bit. The bottom row of every register diagram
shows the default bit values, which are enabled after the chip is powered
on or reset.
Figure 4.1
summarizes the entire SYM53C040 register set.
Figure 4.1
Register Set Overview
0xFC00
SCSI Core and DMA Registers
0xFC1F
0xFC20
SFF-8067 Registers
0xFCFF
0xFD00
Two-Wire Serial Interface Registers
0xFDFF
0xFE00
Miscellaneous Registers
0xFEFF
0xFF00
System Registers
0xFFFF
Symbios SYM53C040 Enclosure Services Processor Technical Manual
8. The term "set" is used to refer to bits that
4-1
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