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FDC37C78-HT Datasheet(PDF) 68 Page - Microchip Technology |
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FDC37C78-HT Datasheet(HTML) 68 Page - Microchip Technology |
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68 / 82 page  68 Table 40 - CR07 BIT NO. BIT NAME DESCRIPTION 0,1 Floppy Boot This bit is used to define the boot floppy. 0 = Drive A (default) 1 = Drive B 2 Media ID0 Polarity 0 = Non-invert 1 = Invert 3 Media ID1 Polarity 0 = Non-invert 1 = Invert 4:6 Reserved Read as 0. 7 Floppy Disk Enable This bit controls the AUTOPOWER DOWN feature of the Floppy Disk. The function is: 0 = Auto powerdown disabled (default) 1 = Auto powerdown enabled This bit is reset to the default state by POR or a hardware reset. CR08 This register can only be accessed in the Configuration Mode and after the CSR has been initialized to 08H. The default value of this register after power up is 00H. This register is read only. CR09 This register can only be accessed in the Configuration Mode and after the CSR has been initialized to 09H. The default value of this register after power up is 00H. This register is read only. CR0A This register can only be accessed in the Configuration Mode and after the CSR has been initialized to 0AH. The default value of this register after power up is 00H. This register is read only. CR0B This register can only be ac1cessed in the Configuration Mode and after the CSR has been initialized to 0BH. The default value of this register after power up is 00H. This register indicates the data rate table used for each drive. Refer to CR1F for Drive Type register. Table 41 - CR0B FDD3 FDD2 FDD1 FDD0 D7 D6 D5 D4 D3 D2 D1 D0 DRT1 DRT0 DRT1 DRT0 DRT1 DRT0 DRT1 DRT0 CR0C This register can only be accessed in the Configuration Mode and after the CSR has been initialized to 0CH. The default value of this register after power up is 00H. This register is reserved. |
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