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| PC87360 Datasheet, PDF (20/168 Pages) National Semiconductor (TI) – 128-Pin LPC SuperI/O with Protection and Extensive GPIO Support | |||
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1.0 Signal/Pin Connection and Description (Continued)
1.4.5 Floppy Disk Controller (FDC)
Signal
DENSEL
DIR
DR0
DR1
DRATE0
DSKCHG
HDSEL
INDEX
MTR0
MTR1
RDATA
STEP
TRK0
WDATA
WGATE
WP
Pin(s) I/O Buffer Type Power Well
Description
75
O
O2/12
Density Select. Indicates that a high FDC density data rate (500
Kbps or 1 Mbps) or a low density data rate (250 or 300 Kbps) is
VDD selected.
DENSEL polarity is controlled by bit 5 of the FDC Configuration
Register.
Direction. Determines the direction of the Floppy Disk Drive
68
O OD12, O2/12 VDD (FDD) head movement (active = step in, inactive = step out)
during a seek operation. During reads or writes, DIR is inactive.
70
O OD12, O2/12
VDD
Drive Select 0. Decoded drive select output signal. DR0 is
controlled by bit 0 of the Digital Output Register (DOR).
71
O OD12, O2/12
VDD
Drive Select 1. Decoded drive select output signal. DR0 is
controlled by bit 1 of the Digital Output Register (DOR).
74
O
O3/6
Data Rate 0. Reflects the value of bit 0 of the Configuration Control
VDD Register (CCR) or the Data Rate Select Register (DSR), whichever
was written to last. Output from the pin is push-pull buffered.
60
I
INT
Disk Change. Indicates if the drive door has been opened. The
VDD
state of this pin is stored in the Digital Input Register (DIR). This pin
can also be configured as the RGATE data separator diagnostic input
signal via the MODE command.
61
O OD12, O2/12
VDD
Head Select. Determines which side of the FDD is accessed.
Active low selects side 1, inactive selects side 0.
73
I
INT
VDD Index. Indicates the beginning of an FDD track.
72
O OD12, O2/12
VDD
Motor Select 0. Active low, motor enable line for drives 0, controlled
by bits D7-4 of the Digital Output Register (DOR).
69
O OD12, O2/12
VDD
Motor Select 1. Active low, motor enable lines for drives 1,
controlled by bits D7-4 of the Digital Output Register (DOR).
62
I
INT
VDD Read Data. Raw serial input data stream read from the FDD.
67
O OD12, O2/12
VDD
Step. Issues pulses to the disk drive at a software programmable
rate to move the head during a seek operation.
64
I
INT
VDD
Track 0. Indicates to the controller that the head of the selected
floppy disk drive is at track 0.
Write Data. Carries out the pre-compensated serial data that is
66
O OD12, O2/12 VDD written to the floppy disk drive. Pre-compensation is software
selectable.
Write Gate. Enables the write circuitry of the selected disk drive.
65
O OD12, O2/12
VDD
WGATE is designed to prevent glitches during power up and
power down. This prevents writing to the disk when power is
cycled.
63
I
INT
Write Protected. Indicates that the disk in the selected drive is
write protected. A software programmable conï¬guration bit (FDC
VDD conï¬guration at Index F0h, Logical Device 0) can force an active
write-protect indication to the FDC, regardless of the status of this
pin.
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