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Table 8: Parallel Interface States
Signal Name
D0 - D7
/STROBE
BUSY
ERROR
/SOP
R/W
/RESET
Line Descriptions
Data Lines (D0...D7)
Byte data is composed of a binary eight-bit pattern presented on the /D0 to /D7 data lines. Input
and output byte data are presented the same way.
Data line formats are outlined in Table 9.
Table 9: Data Line Formats
/SOP
D7
0
0
0
0
0
0
0
'
0
1
The value 0 indicates that the input needs to be set low (for example, <0.8 V DC).
The value 1 indicates that the input needs to be set high (for example, ≥2 V DC).
/SOP Input Line
The /SOP line provides a data packet start/stop mechanism. Transition of the /SOP line from a
high-to-low state indicates the beginning of a data packet, and all subsequent bytes placed on the
data lines are considered packet data bytes. Transition of the /SOP line back from a low-to-high
state indicates the end of a data packet. The master is responsible for controlling the /SOP line.
/STROBE Input Line
The /STROBE line is used to signal the SKB switch to read data from or write data to the data
lines. A change on the data lines has no effect until there is a high-to-low transition on the
Active State
Inactive State
high
low
high
high
low
high = read
low = write
low
D6
D5
D4
0
0
0
0
0
0
0
0
0
'
'
'
1
1
1
low
high
low
low
high
N/A
high
D3
D2
D1
D0
0
0
0
0
0
0
0
0
1
'
'
'
1
1
1
Operating and Maintenance Instructions – 23
Channel
Number
0
0
1
1
0
2
'
'
1
255
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