PC87307VUL National Semiconductor, PC87307VUL Datasheet - Page 110

• Manufacturer Part Number: PC87307VUL
• Description: PC87307/PC97307 Plug and Play Compatible and PC97 Compliant SuperI/O
• Manufacturer: National Semiconductor

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5.8 EXAMPLE OF A FOUR-DRIVE CIRCUIT USING THE PC87307/PC97307
Figure 5-21 shows one implementation of a four-drive circuit. Refer to Table 5-2 on page 72 to see how to encode the drive
and motor bits for this configuration.
PC87307/
PC97307
MTR0
DR0
DR1
FIGURE 5-21. PC87307/PC97307 Four Floppy Disk Drive Circuit
G1
A1
B1
G2
A2
B2
74LS139
1Y0
1Y1
1Y2
1Y3
2Y0
2Y1
2Y2
2Y3
110
Hex Buffers
ICC = 40 mA
Open Collector
7407 (2)
Decoded Signal for Drive 0
Decoded Signal for Drive 1
Decoded Signal for Drive 2
Decoded Signal for Drive 3
Decoded Signal for Motor 0
Decoded Signal for Motor 1
Decoded Signal for Motor 2
Decoded Signal for Motor 3