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Chapter 5
SFF-8067 Registers
This chapter contains descriptions of the SYM53C040 SFF-8067
registers. The SCSI/DMA registers, Two-Wire Serial registers,
Miscellaneous registers, and System registers are described in
Chapter 4
and
Chapter 6
refer to bits that 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 5.1
summarizes the entire SYM53C040 register set.
Figure 5.1
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
through
Chapter
8. The term "set" is used to
5-1
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