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PC87303 Datasheet(PDF) 78 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Part # PC87303
Description  PC87303VUL SuperI/OTM Sidewinder Lite Floppy Disk Controller, Keyboard Controller, Real-Time Clock, Dual UARTs, IEEE 1284 Parallel Port, and IDE Inter
PDF  114 Pages
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Manufacturer  NSC [National Semiconductor (TI)]
Direct Link  http://www.national.com
Logo NSC - National Semiconductor (TI)

PC87303 Datasheet(HTML) 78 Page - National Semiconductor (TI)

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70 Parallel Port (Continued)
2 When WAIT goes low the EPP pulls ASTRB low and
waits for WAIT to go high
If wait was already low steps 2 and 3 occur concurrently
3 When WAIT goes high the EPP stops pulling IOCHRDY
low latches PD0 – PD7 and pulls ASTRB high
4 When RD goes high the EPP puts D0 – 7 in TRI-STATE
EPP 19 Data Write and (Backward) Data Read
This procedure writes to the selected peripheral drive or
register See
Figure 7-5
EPP 19 data read and write operations are similar to EPP
19 address read and write operations respectively except
that the data strobe (DSTRB signal) and a data register re-
place the address strobe (ASTRB signal) and the address
register
Table 7-6 shows the standard 25-pin D-type connector defi-
nition for various parallel port operations
TLC12074 – 35
FIGURE 7-5 EPP 19 Address Read
TABLE 7-6 Parallel Port Pin Out
Connector
Chip
SPP ECP
Pin
EPP Mode
Pin
Pin No
Pin No
Mode
Direction
Direction
1
135
STB
IO
WRITE
IO
2
134
PD0
IO
PD0
IO
3
133
PD1
IO
PD1
IO
4
132
PD2
IO
PD2
IO
5
131
PD3
IO
PD3
IO
6
129
PD4
IO
PD4
IO
7
128
PD5
IO
PD5
IO
8
127
PD6
IO
PD6
IO
9
126
PD7
IO
PD7
IO
10
125
ACK
I
ACK
I
11
124
BUSY
I
WAIT
I
12
123
PE
I
PE
I
13
122
SLCT
I
SLCT
I
14
116
AFD
IO
DSTRB
IO
15
117
ERR
I
ERR
I
16
118
INIT
IO
INIT
IO
17
119
SLIN
IO
ASTRB
IO
78



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