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PC87306 Datasheet(PDF) 74 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Part # PC87306
Description  PC87306 SuperI/OTM Enhanced Sidewinder Lite Floppy Disk Controller, Keyboard Controller, Real-Time Clock, Dual UARTs, Infrared Interface, IEEE 1284 Pa
PDF  110 Pages
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Manufacturer  NSC [National Semiconductor (TI)]
Direct Link  http://www.national.com
Logo NSC - National Semiconductor (TI)

PC87306 Datasheet(HTML) 74 Page - National Semiconductor (TI)

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80 Parallel Port (Continued)
TLC12379 – 45
FIGURE 8-4 EPP 19 Address Write
EPP 19 Address Read
The following procedure reads from the address register
See also
Figure 8-5
1 The host reads a byte from the EPP address register
When RD goes low the EPP pulls IOCHRDY low and
waits for WAIT to go low
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 – 7 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 8-5
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 8-6 shows the standard 25-pin D-type connector defi-
nition for various parallel port operations
TLC12379 – 46
FIGURE 8-5 EPP 19 Address Read
TABLE 8-6 Parallel Port Pin Out
Connector
Chip
SPP ECP
Pin
EPP Mode
Pin
Pin No
Pin No
Mode
Direction
Direction
1
137
STB
IO
WRITE
IO
2
136
PD0
IO
PD0
IO
3
135
PD1
IO
PD1
IO
4
134
PD2
IO
PD2
IO
5
133
PD3
IO
PD3
IO
6
131
PD4
IO
PD4
IO
7
130
PD5
IO
PD5
IO
8
129
PD6
IO
PD6
IO
9
128
PD7
IO
PD7
IO
10
127
ACK
I
ACK
I
11
126
BUSY
I
WAIT
I
12
125
PE
I
PE
I
13
124
SLCT
I
SLCT
I
14
119
AFD
IO
DSTRB
IO
15
120
ERR
I
ERR
I
16
122
INIT
IO
INIT
IO
17
123
SLIN
IO
ASTRB
IO
74



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