fdc37m707 Standard Microsystems Corp., fdc37m707 Datasheet - Page 102

• Manufacturer Part Number: fdc37m707
• Description: Fdc37m707 Enhanced Super I/o Controller With Wake-up Features
• Manufacturer: Standard Microsystems Corp.

The Floppy Disk Control signals are available
optionally on the parallel port pins. When this
mode is selected, the parallel port is not
available. There are two modes of operation,
PPFD1 and PPFD2.
selected in the Parallel Port Mode Register, as
defined in the Parallel Port Mode Register,
Logical Device 3, at 0xF1.
drive 1 on the parallel port pins; PPFD2 has
drive 0 and 1 on the parallel port pins.
When the PPFDC is selected the following pins
are set as follows:
1.
2.
3.
Note: nPDACK, PDRQ and PINTR refer to the
nDACK, DRQ and IRQ chosen for the parallel
port.
The following parallel port pins are read as
follows by a read of the parallel port register:
1.
NOTE
PORT POWER
nPDACK: high-Z
PDRQ: not ECP = high-Z, ECP & dmaEn =
0, ECP & not dmaEn = high-Z
PINTR: not active, this is hi-Z or Low
depending on settings.
Data Register (read) = last Data Register
(write)
PARALLEL
1
: The Parallel Port Control register reads as “Cable Not Connected” when the Parallel Port
CR22.3
FDC is enabled; i.e., STROBE = AUTOFD = SLC = 0 and nINIT = 1.
X
1
0
TABLE 41 - MODIFIED PARALLEL PORT FDD CONTROL
LD3:CRF1.1
PARALLEL PORT FLOPPY DISK CONTROLLER
These modes can be
PARALLEL PORT FDC
X
0
0
1
PPFD1 has only
CONTROL
LD3:CRF1.0
X
0
0
1
102
2.
3.
The following FDC pins are all in the high
impedence state when the PPFDC is actually
selected by the drive select register:
1.
2.
The FDC signals are muxed onto the Parallel
Port pins as shown in Table 42.
For ACPI compliance the FDD pins that are
multiplexed onto the Parallel Port must function
independently of the state of the Parallel Port
controller. For example, if the FDC is enabled
onto the Parallel Port the multiplexed FDD
interface should function normally regardless of
the Parallel Port Power control, CR22.3. Table
41 illustrates this functionality.
PARALLEL PORT
Control
connected" STROBE, AUTOFD and SLC =
0 and nINIT =1
Status Register reads: nBUSY = 0, PE = 0,
SLCT = 0, nACK = 1, nERR = 1
nWDATA, DENSEL, nHDSEL, nWGATE,
nDIR,
nMTR1.
If PPFDx is selected, then the parallel port
can not be used as a parallel port until
"Normal" mode is selected.
FDC STATE
OFF
OFF
ON
nSTEP,
Register
nDS1,
read
PARALLEL PORT
(NOTE
STATE
nDS0,
as
OFF
OFF
ON
"cable
1
)
nMTR0,
not