FDC37B787QF SMSC [SMSC Corporation], FDC37B787QF Datasheet - Page 109

• Manufacturer Part Number: FDC37B787QF
• Description: Super I/O Controller with ACPI Support, Real Time Clock and Consumer IR
• Manufacturer: SMSC [SMSC Corporation]

NOTE
Refer to Force Write Protect in the Floppy Disk Controller section for information on the Floppy disk
Controller Force Write Protect function.
Power management capabilities are provided for
the following logical devices: floppy disk, UART 1,
UART 2 and the parallel port. For each logical
device, two types of power management are
provided; direct powerdown and auto powerdown.
FDC Power Management
Direct power management is controlled by CR22.
Refer to CR22 for more information.
1
: The Parallel Port Control register reads as “Cable Not Connected” when the Parallel Port FDC
is enabled; i.e., STROBE = AUTOFD = SLC = 0 and nINIT = 1.
Note 1: These pins are outputs in mode PPFD2, inputs in mode PPFD1.
SPP MODE
nSTROBE
nERROR
nSLCTIN
BUSY
nACK
SLCT
nALF
nINIT
PD0
PD1
PD2
PD3
PD4
PD5
PD6
PD7
PE
TABLE 47 - FDC PARALLEL PORT PINS
PIN DIRECTION
POWER MANAGEMENT
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I
I
I
I
I
110
FDC MODE
nDSKCHG
DRVDEN0
Auto Power Management is enabled by CR23-B0.
When set, this bit allows FDC to enter powerdown
when all of the following conditions have been met:
1.
2.
3.
nWGATE
nWDATA
nRDATA
(nMTR0)
nHDSEL
nINDEX
nMTR1
(nDS0)
nSTEP
nTRK0
nDS1
nDIR
nWP
The motor enable pins of register 3F2H are
inactive (zero).
The part must be idle; MSR=80H and INT = 0
(INT may be high even if MSR = 80H due to
polling interrupts).
The head unload timer must have expired.
-
-
PIN DIRECTION
I/(O) Note1
I/(O) Note1
O
O
O
O
O
O
O
O
-
-
I
I
I
I
I