w83c553f Winbond Electronics Corp America, w83c553f Datasheet - Page 133
w83c553f
Manufacturer Part Number
w83c553f
Description
System I/o Controller With Pci Arbiter
Manufacturer
Winbond Electronics Corp America
Datasheet
1.W83C553F.pdf
(159 pages)
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W83C553F
The Bus Master IDE Register set is defined by the PCI SIG. It is composed of 16 8-bit registers and is located at the I/O
address specified by Base Address Register 4. The registers can be accessed 8, 16, 24, or 32 bits at a time.
This register set is supplied to offer a higher performance lower overhead IDE disk protocol. With this protocol, the host
(PCI) transfers will be bus master cycles and the IDE device transfers will be DMA. The normal PIO protocol uses I/O
transfers on both the host and IDE interfaces. Primary and Secondary refer to the primary and secondary IDE ports. Both
register sets are identical.
Offset from
Base Address
03h - 00h
07h - 04h
0Bh - 08h
0Fh - 0Ch
Note: The registers shown in Table 4-5 cannot be accessed until after Base Address Register 4 is written (with any non zero
value).
WINBOND SYSTEMS LABORATORY
4.4
Bus Master IDE (Function 1) I/O Registers
31
Reserved
Reserved
Table 4-5. Bus Master IDE I/O Register Organization
24
23
Primary Status
Register
Secondary Status
Register
Primary PRD Table Address
Secondary PRD Table Address
Register Bits
16
15
Reserved
Reserved
8
Electrical Specifications
7
Primary Command
Register
Secondary Command
Register
0
130
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