PC87393VJG National Semiconductor, PC87393VJG Datasheet - Page 42

• Manufacturer Part Number: PC87393VJG
• Description: IC, SUPER I/O DEVICE, TQFP-100
• Manufacturer: National Semiconductor

Specifications of PC87393VJG

• Data Rate: 2Mbps
• Supply Voltage Range: 3V to 3.6V
• Logic Case Style: TQFP
• No. Of Pins: 100
• Operating Temperature Range: 0°C to +70°C
• Termination Type: SMD
• Transceiver Type: Interface
• Rohs Compliant: No

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2.0 Device Architecture and Configuration
2.10.6 SuperI/O Configuration 5 Register (SIOCF5)
Location:
Type:
Bit
Name
Reset
6-5
1-0
Bit
7
4
3
2
1.
PNF Status. This bit describes the status of the PNF signal, which determines if Parallel Port of external FDD sig-
nals are selected by PPM mode. This is a RO bit.
0: Floppy Disk
1: Parallel Port (default)
Pin 35 Function Select. These are R/W bits.
Bits
6 5
0 0
0 1
1 0
1 1
SMI to IRQ2 Enable. This is a R/W bit.
0: Disabled (default)
1: Enabled
Pin 34 Function Select. This is a R/W bit.
0: DRATE0 (default)
1: IRSL2
PPM Power Save Enable
0: Disabled (default).
1: When PPM is active and PNF is 0 (bit 7 of this register), the FDC output pins and the Parallel Port output
Pin 71 Function Select.
1 0
1 1
Bits
1 0
0 0
0 1
In the PC87391, this pin is pulled up after reset by an internal pull-up resistor. Software should set this field as
appropriate to enable the required Legacy function.
pins are masked when the corresponding drive is not used.
Index 25h
Varies per bit
PNF Status
Function
PPM disabled (default)
PNF signal selected as active low (high selects printer, low selects floppy)
PNF signal selected as active high (low selects printer, high selects floppy)
XRDY signal selected
Function
GPIO37 (default)
DR1
IRSL2
XIORD
7
1
6
0
1
This is a R/W bit.
Function
Pin 35
Select
5
0
SMI to IRQ2
Enable
Description
42
4
0
(Continued)
Function
Pin 34
Select
3
0
Save Enable
PPM Power
2
0
1
0
Function
Pin 71
Select
0
0