FDC87W21 Ver la hoja de datos (PDF) - SMSC -> Microchip
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FDC87W21 Datasheet PDF : 164 Pages
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SYMBOL
SLCT
nERR
nSLIN
PIN
I/O
FUNCTION
28
INt PRINTER MODE: SLCT
An active high input on this pin indicates that the printer is selected.
This pin is pulled high internally. Refer to the description of the
parallel port for the definition of this pin in ECP and EPP mode.
OD12 EXTENSION FDD MODE: WE2
This pin is for Extension FDD B; its functions are the same as
those of the nWE pin.
OUT12t EXTENSION ADAPTER MODE: XA1
This pin is system address A1 for the Extension Adapter.
OD12 EXTENSION 2FDD MODE: nWE2
This pin is for Extension FDD A and B; this function of this pin is
the same as that of the nWE pin.
-
JOYSTICK MODE: NC pin.
29
INt PRINTER MODE: nERR
An active low input on this pin indicates that the printer has
encountered an error condition. This pin is pulled high internally.
Refer to the description of the parallel port for the definition of this
pin in ECP and EPP mode.
OD12 EXTENSION FDD MODE: nHEAD2
This pin is for Extension FDD B; its function is the same as that of
the nHEAD pin.
OUT12t EXTENSION ADAPTER MODE: XA2
This pin is system address A2 for the Extension Adapter.
OD12 EXTENSION 2FDD MODE: nHEAD2
This pin is for Extension FDD A and B; its function is the same as
that of the nHEAD pin.
-
JOYSTICK MODE: NC pin.
22
OD12 PRINTER MODE: nSLIN
Output line for detection of printer selection. This pin is pulled high
internally. Refer to the description of the parallel port for the
definition of this pin in ECP and EPP mode.
OD12 EXTENSION FDD MODE: nSTEP2
This pin is for Extension FDD B; its function is the same as that of
the nSTEP pin.
OUT12t EXTENSION ADAPTER MODE: XTC
This pin is the DMA terminal count for the Extension Adapter. The
count is sent by TC directly.
OD12 EXTENSION 2FDD MODE: nSTEP2
This pin is for Extension FDD A and B; its function is the same as
that of the nSTEP pin.
OUT12t JOYSTICK MODE: VDD for joystick.
11
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