F81866A Datasheet, PDF (19/210 Pages) Feature Integration Technology Inc. – 6 UARTs Super IO With 128 Bytes FIFO and Power

F81866A
the modem or data set has detected a data carrier.
GPIO54
I/OOD_{14st, 5v}
General Purpose IO.
Direction of the head step motor. An open drain
output.
DIR#
OD_14,5v
Logic 1 = outward motion
13
3VCC
Logic 0 = inward motion
Ring Indicator. An active low signal indicates that a
RI6#
IN_st,5v
ring signal is being received from the modem or data
set.
GPIO55
I/OOD_{14st, 5v}
General Purpose IO.
Step output pulses. This active low open drain output
14
STEP#
OD_14,5v
3VCC _{produces a pulse to move the head to another track.}
CTS6#
IN_st,5v
Clear To Send is the modem control input.
GPIO56
I/OOD_{14st, 5v}
General Purpose IO.
Head select. This open drain output determines
which disk drive head is active.
15
HDSEL#
OD_14,5v
3VCC ^{Logic 1 = side 0}
Logic 0 = side 1
UART Data Terminal Ready. An active low signal
DTR6#
O₁₄
informs the modem or data set that controller is
ready to communicate.
GPIO57
I/OOD_{14st, 5v}
General Purpose IO.
WGATE#
OD_14,5v
Write enable. An open drain output.
16
3VCC _{Data Set Ready. An active low signal indicates the}
DSR6#
IN_st,5v
modem or data set is ready to establish a
communication link and transfer data to the UART.
GPIO60
I/OOD_{12st, 5v}
General Purpose IO.
RDATA#
17
DCD5#
IN_st,5v
IN_st,5v
3VCC
The read data input signal from the FDD.
Data Carrier Detect. An active low signal indicates
the modem or data set has detected a data carrier.
GPIO61
I/OOD_{12st, 5v}
General Purpose IO.
Track 0. This Schmitt-triggered input from the disk
TRK0#
18
IN_st,5v
3VCC
drive is active low when the head is positioned over
the outermost track.
Ring Indicator. An active low signal indicates that a
RI5#
IN_st,5v
ring signal is being received from the modem or data
set.
GPIO62
I/OOD_{12st, 5v}
General Purpose IO.
This Schmitt-triggered input from the disk drive is
19
INDEX#
IN_st,5v
3VCC
active low when the head is positioned over the
beginning of a track marked by an index hole.
CTS5#
IN_st,5v
Clear To Send is the modem control input.
GPIO63
I/OOD_{12st, 5v}
General Purpose IO.
20
WPT#
IN_st,5v
3VCC
Write protected. This active low Schmitt input from
the disk drive indicates that the diskette is
write-protected.
19
Jan, 2012
V0. 12P