FDC37C665GT-MS Standard Microsystems (SMSC), FDC37C665GT-MS Datasheet - Page 22

• Manufacturer Part Number: FDC37C665GT-MS
• Manufacturer: Standard Microsystems (SMSC)

Specifications of FDC37C665GT-MS

• Pin Count: 100
• Lead Free Status / RoHS Status: Compliant

SUPER I/O REGISTERS
The address map, shown below in Table 1,
shows the addresses of the different blocks of
the Super I/O immediately after power up. The
base addresses of the FDC, IDE, serial and
parallel
configuration registers.
used to access more than one register.
Note 1: Configuration registers can only be modified in configuration mode, entered only by writing a
Note 2: Address at power up; These addresses can be changed in the configuration setup.
Note 3: Addresses 320H-323H and 3F5-3F7H for XT Mode. Selectable in configuration setup.
security code sequence to 3F0. The configuration registers can only be read in configuration
mode by accessing 3F1. Access to status registers A and B of the floppy disk is disabled in
configuration mode. Outside of configuration mode, a read of 3F0 accesses status register A
and a read of 3F1 accesses status register B of the floppy disk.
3F0, 3F1
3F0, 3F1
3F2, 3F3, 3F4, 3F5, 3F7
3F8-3FF
2F8-2FF
278-27A
1F0-1F7, 3F6, 3F7
ports
can
ADDRESS
be
Table 1 - FDC37C665GT/666GT Block Addresses
Some addresses are
moved
FUNCTIONAL DESCRIPTION
via
Configuration
Floppy Disk
Floppy Disk
Serial Port Com 1
Serial Port Com 2
Parallel Port
IDE
BLOCK NAME
the
22
HOST PROCESSOR INTERFACE
The host processor communicates with the
FDC37C665GT/666GT through a series of
read/write registers.
these registers are shown in Table 1. Register
access is accomplished through programmed
I/O or DMA transfers. All registers are 8 bits
wide except the IDE data register at port 1F0H
which is 16 bits wide. All host interface output
buffers are capable of sinking a minimum of 24
mA.
Write only; Note 1, 2
Read only; Address at power
up; Note 2
Address at power up; Note 2
Address at power up; Note 2
Address at power up; Note 2
Address at power up; Note 2
AT Mode; Note 2, 3
NOTES
The port addresses for