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FDC37B77X Datasheet(PDF) 14 Page - SMSC Corporation |
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FDC37B77X Datasheet(HTML) 14 Page - SMSC Corporation |
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14 / 196 page  14 STATUS REGISTER A (SRA) Address 3F0 READ ONLY This register is read-only and monitors the state of the FINTR pin and several disk interface pins in PS/2 and Model 30 modes. The SRA can be accessed at any time when in PS/2 mode. In the PC/AT mode the data bus pins D0 - D7 are held in a high impedance state for a read of address 3F0. PS/2 Mode BIT 0 DIRECTION Active high status indicating the direction of head movement. A logic "1" indicates inward direction; a logic "0" indicates outward direction. BIT 1 nWRITE PROTECT Active low status of the WRITE PROTECT disk interface input. A logic "0" indicates that the disk is write protected. BIT 2 nINDEX Active low status of the INDEX disk interface input. BIT 3 HEAD SELECT Active high status of the HDSEL disk interface input. A logic "1" selects side 1 and a logic "0" selects side 0. BIT 4 nTRACK 0 Active low status of the TRK0 disk interface input. BIT 5 STEP Active high status of the STEP output disk interface output pin. BIT 6 nDRV2 Active low status of the DRV2 disk interface input pin, indicating that a second drive has been installed. Note: This function is not supported in the FDC37B77x. BIT 7 INTERRUPT PENDING Active high bit indicating the state of the Floppy Disk Interrupt output. 7 6 5 4 3 2 1 0 INT PENDING nDRV2 STEP nTRK0 HDSEL nINDX nWP DIR RESET COND. 0 1 0 N/A 0 N/A N/A 0 |
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