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参数资料
型号： PC87393F-VJG
厂商： NATIONAL SEMICONDUCTOR CORP
元件分类： 外设及接口
英文描述： 100-Pin LPC SuperI/O Devices for Portable Applications
中文描述： MULTIFUNCTION PERIPHERAL, PQFP100
封装： TQFP-100
文件页数： 60/148页
文件大小： 1733K
代理商： PC87393F-VJG
1.0 Signal/Pin Connection and Description (Continued)
19
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1.5.4
Floppy Disk Controller (FDC)
Signal
Pin(s)
I/O Buffer Type Power Well
Description
DENSEL
33, 53
O
O2/12
VDD
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.
DIR
29, 49
O
OD12,O2/12
VDD
Direction. Determines the direction of the Floppy Disk Drive
(FDD) head movement (active = step in, inactive = step out)
during a seek operation.
DR1
DR0
41, 71,
72
30
OOD12,O2/12
VDD
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).
DRATE0
34, 73
O
O3/6
VDD
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.
DRATE1
53
O
O3/6
VDD
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.
DSKCHG
21, 45
I
INT
VDD
Disk Change. Indicates if the drive door has been opened.
HDSEL
22, 51
O
OD12,O2/12
VDD
Head Select. Determines which side of the FDD is accessed.
Active low selects side 1, inactive selects side 0.
INDEX
32, 52
I
INT
VDD
Index. Indicates the beginning of an FDD track.
MSEN1, 0
42, 44
I
INT
VDD
Automatic Media Sense. Identies the media type of the oppy
disk in drive 1 and 0, if the drive supports this protocol.
MTR1
MTR0
84, 73,
40
31
OOD12,O2/12
VDD
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.
RDATA
23, 46
I
INT
VDD
Read Data. Raw serial input data stream read from the FDD.
STEP
28, 47
O
OD12,O2/12
VDD
Step. Issues pulses to the FDD at a software programmable rate
to move the head during a seek operation.
TRK0
25, 50
I
INT
VDD
Track 0. Indicates to the controller that the head of the selected
FDD is at track 0.
WDATA
27, 37
O
OD12,O2/12
VDD
Write Data. Carries out the pre-compensated serial data that is
written to the FDD. Pre-compensation is software selectable.
WGATE
26, 36
O
OD12,O2/12
VDD
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.
WP
24, 48
I
INT
VDD
Write Protected. Indicates that the disk in the selected drive is
write protected.
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