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数据搜索系统，热门电子元器件搜索 |
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PC87373 数据表(PDF) 19 Page - National Semiconductor (TI) |
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PC87373 数据表(HTML) 19 Page - National Semiconductor (TI) |
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19 / 174 page  1.0 Signal/Pin Connection and Description (Continued) 19 www.national.com Revision 1.1 1.4.4 Floppy Disk Controller (FDC) Signal Pin(s) I/O Buffer Type Power Well Description DENSEL 22 O OD12 O6/12 VDD3 Density Select. Indicates that a high FDC density data rate (500 Kbps, 1 Mbps or 2 Mbps) or a low density data rate (250 or 300 Kbps) is selected. DIR 17 O OD12 O6/12 VDD3 Direction. Determines the direction of the Floppy Disk Drive (FDD) head movement (active = step in; inactive = step out) during a seek operation. DR0 18 O OD12 O6/12 VDD3 Drive Select. Active low signal controlled by bit 0 of the Digital Output Register (DOR). DRATE0 21 O OD12 O6/12 VDD3 Data Rate. Reflects the value of bit 0 of either Configuration Control Register (CCR) or Data Rate Select Register (DSR), whichever was written to last. DSKCHG 9 I INTS VDD3 Disk Change. Indicates that the drive door was opened. HDSEL 10 O OD12 O6/12 VDD3 Head Select. Selects which side of the FDD is accessed. Active (low) selects side 1; inactive selects side 0. INDEX 20 I INTS VDD3 Index. Indicates the beginning of an FDD track. MTR0 19 O OD12 O6/12 VDD3 Motor Select. Active low motor enable signal for drive 0, controlled by bit D4 of the Digital Output Register (DOR). RDATA11 I INTS VDD3 Read Data. Raw serial input data stream read from the FDD. STEP 16 O OD12 O6/12 VDD3 Step. Issues pulses to the disk drive at a software programmable rate to move the head during a seek operation. TRK0 13 I INTS VDD3 Track 0. Indicates to the controller that the head of the selected floppy disk drive is at track 0. WDATA15 O OD12 O6/12 VDD3 Write Data. Carries out the pre-compensated serial data that is written to the FDD. Pre-compensation is software selectable. WGATE 14 O OD12 O6/12 VDD3 Write Gate. Enables the write circuitry of the selected FDD. WGATE is designed to prevent glitches during power-up and power-down. This prevents writing to the disk when power is cycled. WP 12 I INTS VDD3 Write Protected. Indicates that the disk in the selected drive is write protected. |
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