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Chapter 6
Two-Wire Serial
Registers
This chapter contains descriptions of the SYM53C040 Two-Wire Serial
interface registers. The SCSI/DMA registers, SFF-8067 registers,
Miscellaneous registers, and System registers are described in
Chapter
5,
Chapter
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. 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 6.1
summarizes the entire SYM53C040 register set.
Figure 6.1
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
7, and
Chapter
8. The term "set" is used to refer to
Chapter
4,
6-1
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