FDC37C669_07 SMSC [SMSC Corporation], FDC37C669_07 Datasheet - Page 114

• Manufacturer Part Number: FDC37C669_07
• Description: PC 98/99 Compliant Super I/O Floppy Disk Controller with Infrared Support
• Manufacturer: SMSC [SMSC Corporation]

The IDE interface enables hard disks with
embedded controllers (AT and XT) to be
interfaced to the host processor. The following
definitions are for reference only.
registers
FDC37C669.
controlled by the FDC37C669.
information, refer to the IDE pin descriptions
and the ATA specification.
HOST FILE REGISTERS
The HOST FILE REGISTERS are accessed by
the AT Host, rather than the Local Processor.
There are two groups of registers, the AT Task
File, and the Miscellaneous AT Registers.
TASK FILE REGISTERS
Task File Registers may be accessed by the
host AT when pin nHDCS0 is active (low). The
Data Register (1F0H) is 16 bits wide; the
remaining task file registers are 8 bits wide. The
task file registers are
are
FIGURE 2 - HOST PROCESSOR REGISTER ADDRESS MAP (AT MODE)
Access to these registers is
not
INTEGRATED DRIVE ELECTRONICS INTERFACE
implemented
REGISTER ADDRESS
(CR21) IDE BASE I/O
(CR22) BASE I/O
ADDRESS +[0:7]
ATA
ADDRESS +6
and
For more
in
These
EATA
the
114
TASK FILE REGISTERS
ADDRESS (CR21) Base +[0:7]
These AT registers contain the Task File
Registers. These registers communicate data,
command, and status information with the AT
host, and are addressed when nHDCS0 is low.
ADDRESS (CR22) Base +6
This AT register may be used by the BIOS for
drive control. It is accessed by the AT interface
when nHDSC1 is active.
Figure 2 shows the AT Host Register Map of
the FDC37C669.
compatible. Please refer to the ATA and EATA
specifications. These are available from:
MISC AT REGISTER
Global Engineering
2805 McGaw Street
Irvine, CA 92714
[phone]
[phone]