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PC87334VLJ Datasheet(PDF) 32 Page - National Semiconductor (TI) |
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PC87334VLJ Datasheet(HTML) 32 Page - National Semiconductor (TI) |
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32 / 102 page  30 FDC Register Description (Continued) D4 5 Drive ID01 (For Enhanced mode) Bits 4 and 5 are read only bits which hold the val- ues of pins DRID01 D3 2 Bits 3 and 2 are readwrite bits that control logical drive exchange When working in four drive encoded mode (bit 4 of FER is 1) the logical drive exchange is not per- formed 00 No logical drive exchange 01 Logical drive exchange between drives 0 and 1 as selected by bit 4 of FCR 10 Logical drive exchange between drives 0 and 2 This bit allows software to exchange the physi- cal floppy disk control signals assigned to drive 0 and 2 Under these conditions the DR0 DR23 and MTR0 pin functions are as follows DR2 internal signal to DR0 pin MTR2 internal signal to MTR0 pin DR0 internal signal to DR23 pin Note Drive 3 is not exchanged at the same time as Drive 2 11 Reserved Unpredictable results when 11 is configured D1 0 Tape Select 10 These bits assign a logical drive number to a tape drive Drive 0 is not available as a tape drive and is reserved as the floppy disk boot drive See Table 3-4 for the tape drive assignment values TABLE 3-4 Media ID Bit Functions Bit 7 Bit 6 Bit 5 Media Type X X 1 Invalid Data 0 0 0 525 0 1 0 288M 1 0 0 144M 1 1 0 720k TABLE 3-5 Tape Drive Assignment Values TAPESEL1 TAPESEL0 Drive Selected 0 0 None 01 1 10 2 11 3 TABLE 3-3 TDR Operation Modes Mode FCR ASC TDR D7 D6 D5 D4 D3 D2 D1 D0 Bit 0 Bit 2 Bit Compatible AT TDR 10 DESC XX X X X X TAPE TAPE SEL 1 SEL 0 RESET NA NA NA NA NA NA 0 0 COND Automatic Media Sense 00 DESC ED HD VALID XX X TAPE TAPE DATA SEL 1 SEL 0 RESET NA NA NA NA NA NA 0 0 COND Enhanced or 1 0 1 DESC ED HD DRID1 DRID0 SWP1 SWP0 TAPE TAPE SEL 1 SEL 0 RESET NA NA NA NA 0 0 0 0 COND 32 |
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