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3.6.5
Write/Read Data, Write/PLO Clock
The method for sending WRITE/READ DATA and WRITE/PLO CLOCK signals
onto the A cable of the interface is shown in Table 3.5 and Fig. 3.12
Table 3.5 W/R DATA and W/P CLOCK
Signal Name
Assigned
Switch
SW4
±WRITE DATA
Key 7, Key 8 ON
±READ DATA
Key 1, Key 2 ON
±WRITE CLOCK
Key 5, Key 6 ON
±PLO CLOCK
Key 3, Key 4 ON
SW4 (Mounting Location B5)
OFF
ON
Key 1
2
Key 2
3
Key 3
4
Key 4
The figure at left shows the switch
selection procedures when all
5
Key 5
the signals are to be sent on the A cable.
6
Key 6
7
Key 7
8
Key 8
Fig. 3.12 W/R DATA and W/P CLOCK
3.6.6
Assigning the Number of Sectors
The number of sectors can be assigned by using a combination of the
SWl
and
SW2
switch keys. Each key of the respective switch corresponds to binary powers of the
byte count (2° to 211 bytes). See Table 3.6.
Table 3.6 Sector Counter Byte Table
SW1
No. of Bytes
SW2
No. of Bytes
Key 8
1
Key 8
256
Key 7
2
Key 7
512
Key 6
4
Key 6
1024
Key 5
8
Key 5
2048
Key 4
16
Key 3
32
Key 2
64
Key 1
128
The method of assigning the number of sectors is shown in Table 3.7 and Fig. 3.13,
where the LAST SECTOR indicates the number of excess bytes. This also indicates
that only the last sector becomes longer because of excess bytes.
B03P-4605-0003A .... B
3-11
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