FDC37M81 SMSC [SMSC Corporation], FDC37M81 Datasheet - Page 67

no-image

FDC37M81

Manufacturer Part Number
FDC37M81
Description
PC98/99 Compliant Enhanced Super I/O Controller with Keyboard/Mouse Wake-Up
Manufacturer
SMSC [SMSC Corporation]
Datasheet

Available stocks

Company
Part Number
Manufacturer
Quantity
Price
Part Number:
FDC37M812
Manufacturer:
SMSC
Quantity:
1
Part Number:
FDC37M812
Manufacturer:
NEC
Quantity:
6 000
Part Number:
FDC37M812
Manufacturer:
SMSC
Quantity:
1 000
Part Number:
FDC37M812
Manufacturer:
SMSC
Quantity:
1 000
Part Number:
FDC37M812
Manufacturer:
SMSC
Quantity:
20 000
Part Number:
FDC37M813
Manufacturer:
FORTUNE
Quantity:
176
Part Number:
FDC37M813
Manufacturer:
SMSC
Quantity:
1 000
Part Number:
FDC37M817
Manufacturer:
SMSC
Quantity:
20 000
Part Number:
FDC37M817-MS
Manufacturer:
Microchip Technology
Quantity:
10 000
LOCK
In order to protect systems with long DMA
latencies against older application software that
can disable the FIFO the LOCK Command has
been added.
used by the FDC routines, and application
software should refrain from using it.
application calls for the FIFO to be disabled
then the CONFIGURE command should be
used.
The LOCK command defines whether the
EFIFO, FIFOTHR, and PRETRK parameters of
the CONFIGURE command can be RESET by
the DOR and DSR registers. When the LOCK
bit is set to logic "1" all subsequent "software
RESETS by the DOR and DSR registers will not
change the previously set parameters to their
default values. All "hardware" RESET from the
RESET_DRV pin will set the LOCK bit to logic
"0" and
PRETRK to their default values. A status byte is
returned immediately after issuing a LOCK
command. This byte reflects the value of the
LOCK bit set by the command byte.
return the EFIFO, FIFOTHR, and
WGATE
This command should only be
0
0
1
1
GAP
0
1
0
1
Table 28 - Effects of WGATE and GAP Bits
Conventional
Perpendicular
(500 Kbps)
Reserved
(Conventional)
Perpendicular
(1 Mbps)
MODE
If an
67
GAP2 FORMAT
LENGTH OF
ENHANCED DUMPREG
The DUMPREG command is designed to
support
application software development and debug.
To accommodate the LOCK command and the
enhanced PERPENDICULAR MODE command
the eighth byte of the DUMPREG command has
been modified to contain the additional data
from these two commands.
COMPATIBILITY
The FDC37M81x was designed with software
compatibility in mind. It is a fully backwards-
compatible solution with the older generation
765A/B
implements on-board registers for compatibility
with the PS/2, as well as PC/AT and PC/XT,
floppy disk controller subsystems. After a
hardware reset of the FDC, all registers,
functions and enhancements default to a PC/AT,
PS/2 or PS/2 Model 30 compatible operating
mode, depending on how the IDENT and MFM
bits are configured by the system BIOS.
22 Bytes
22 Bytes
22 Bytes
41 Bytes
FIELD
disk
system
controllers.
PORTION OF
WRITE DATA
WRITTEN BY
OPERATION
run-time
19 Bytes
38 Bytes
0 Bytes
0 Bytes
GAP 2
The
diagnostics
FDC
also
and

Related parts for FDC37M81