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Chapter 7
Miscellaneous
Registers
This chapter contains descriptions of the SYM53C040 Miscellaneous
registers. The SCSI/DMA registers, SFF-8067 registers, Two-Wire Serial
registers, and System registers are described in
Chapter
7, and
Chapter
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 be changed 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 7.1
summarizes the entire SYM53C040 register set.
Figure 7.1
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 are
Chapter 4
through
7-1
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