PC87393VJG National Semiconductor, PC87393VJG Datasheet - Page 19

• 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

1.0 Signal/Pin Connection and Description
1.5.4
DENSEL
DIR
DR1
DR0
DRATE0
DRATE1
DSKCHG
HDSEL
INDEX
MSEN1, 0
MTR1
MTR0
RDATA
STEP
TRK0
WDATA
WGATE
WP
Signal
Floppy Disk Controller (FDC)
33, 53
29, 49
41, 71,
72
30
34, 73
53
21, 45
22, 51
32, 52
42, 44
84, 73,
40
31
23, 46
28, 47
25, 50
27, 37
26, 36
24, 48
Pin(s)
I/O Buffer Type Power Well
O
O
O
O
O
O
O
O
O
O
I
I
I
I
I
I
OD
OD
OD
OD
OD
OD
OD
O
12
12
12
12
12
12
12
O
O
IN
IN
IN
IN
IN
IN
2/12
, O
, O
, O
, O
, O
, O
, O
3/6
3/6
T
T
T
T
T
T
2/12
2/12
2/12
2/12
2/12
2/12
2/12
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
DD
DD
DD
DD
DD
DD
DD
DD
DD
DD
DD
DD
DD
DD
DD
DD
Density Select. Indicates that a high FDC density data rate (500
Kbps, 1 Mbps or 2 Mbps) or a low density data rate (250 or 300
Kbps) is selected.
Direction. Determines the direction of the Floppy Disk Drive
(FDD) head movement (active = step in, inactive = step out)
during a seek operation.
Drive Select. Decoded output signals in 2-drive mode, or
encoded signals in 4-drive mode. Controlled by bits 1 and 0 of the
Digital Output register (DOR).
Data Rate 0. Reflects the value of bit 0 of the Configuration Control
register (CCR) or the Data Rate Select register (DSR), whichever
was written to last.
Data Rate 1. Reflects the value of bit 1 of the Configuration Control
register (CCR) or the Data Rate Select register (DSR), whichever
was written to last. Available on the PPM pins only.
Disk Change. Indicates if the drive door has been opened.
Head Select. Determines which side of the FDD is accessed.
Active low selects side 1, inactive selects side 0.
Index. Indicates the beginning of an FDD track.
Automatic Media Sense. Identifies the media type of the floppy
disk in drive 1 and 0, if the drive supports this protocol.
Motor Select. Active low, motor enable lines for drive 1 and 0,
controlled by bits D7-4 of the Digital Output register (DOR). MTR0 is
used to decode DR1 and DR0 in 4-drive mode.
Read Data. Raw serial input data stream read from the FDD.
Step. Issues pulses to the FDD at a software programmable rate
to move the head during a seek operation.
Track 0. Indicates to the controller that the head of the selected
FDD is at track 0.
Write Data. Carries out the pre-compensated serial data that is
written to the FDD. Pre-compensation is software selectable.
Write Gate. Enables the write circuitry of the selected FDD.
WGATE is designed to prevent glitches during power-up and
power-down. This prevents writing to the disk when power is
cycled.
Write Protected. Indicates that the disk in the selected drive is
write protected.
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Description
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