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Table 2-10
NS87336VLJ Pin Descriptions (continued)
Pin
No.
/MSEN0
52, 51
/MSEN1
(Normal Mode)
/MSEN0
88, 86
/MSEN1
(PPM Mode)
/MTR0
46, 43
/MTR1
(Normal Mode)
/MTR1
84
(PMM Mode)
PD
45
PD0-7
94-91,
89-86
PE
83
PNF
49
/RD
19
/RDATA
35
(Normal Mode)
/RDATA
91
(PPM Mode)
I/O
Description
I
Media Sense. These pins are Media Sense input pins when bit 0 of
FCR is 0. Each pin has a 10 KΩ internal pull-up resistor. When bit 0
of FCR is 1, these pins are Data Rate output pins and the pull-up
resistors are disabled.
I
Media Sense. These pins gives additional Media Sense signals for
PPM Mode and PNF = 0.
O
FDC Motor Select 0, 1. These are the motor enable lines for drives
0 and 1, and are controlled by bits D7-D4 of the Digital Output
register.
They are active low outputs.
information to control four FDDs when bit 4 of the Function Enable
Register (FER) is set. MTR0 exchanges logical motor values with
MTR1 when bit 4 of FCR is set.
O
FDC Motor Select 1. This pin offers an additional Motor Select 1
signal in PPM mode when PNF = 0. This pin is the motor enable line
for drive 1 when bit 4 of FCR is 0. It is the motor enable line for drive
0 when bit 4 of FCR 1. This signal is active low
O
FDC Power Down. This pin is PD output when bit 4 of PMC is 1. It
is /DR1 when bit 4 of PMC is 0. PD is active high whenever the FDC
is in power-down state, either via bit 6 of the DSR (or bit 3 of FER, or
bit 0 of PTR), or via the mode command.
I/O
Parallel Port Data. These bidirectional pins transfer data to and
from the peripheral data bus and the parallel port Data Register.
These pins have high current drive capability.
I
Parallel Port Paper End. This input is set high by the printer when it
is out of paper. This pin has a nominal 25 KΩ pull-down resistor
attached to it.
I
Printer Not Floppy. PNF is the Printer Not Floppy pin when bit 2 of
FCR is 1. It selects the device which is connected to the PPM pins.
A parallel printer is connected when PNF = 1 and a floppy disk drive
is connected when PNF = 0. This pin is the DRV2 input pin when bit
2 of FCR is 0.
I
Read. Active low input to signal a data read by the microprocessor.
I
FDD Read Data. This input is the raw serial data read from the
floppy disk drive.
I
FDD Read Data. This pin supports an additional Read Data signal in
PPM Mode when PNF = 0.
They are encoded with
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