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PC87427 Datasheet(PDF) 14 Page - National Semiconductor (TI) |
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PC87427 Datasheet(HTML) 14 Page - National Semiconductor (TI) |
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14 / 46 page  1.0 Signal/Pin Connection and Description (Continued) www.national.com 14 Revision 1.0 1.4.9 Floppy Disk Controller (FDC) GPO60-63 54,48, 45,55 O O3/6 VSB General-Purpose Output Ports. GPEXD 79 I/O INTS/O14/14 VSB General-Purpose I/O Extension Data. GPEXC 80 O O14/14 VSB General-Purpose I/O Extension Clock. GPEXC2 81 O O14/14 VSB General-Purpose I/O Extension Clock 2. Signal Pin(s) I/O Buffer Type Power Well Description DENSEL 74 O OD12,O6/12 VDD Density Select. Indicates that either 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 65 O OD12,O6/12 VDD Direction. Determines the direction of the Floppy Disk Drive (FDD) head movement (active = step in; inactive = step out) during a seek operation. DR0 67 O OD12,O6/12 VDD Drive Select. Controlled by bit 0 of the Digital Output Register (DOR). DRATE0 73 O OD12,O6/12 VDD Data Rate. Reflects the value of bit 0 of the Configuration Control Register (CCR) or the Data Rate Select Register (DSR), whichever was written to last. DSKCHG 57 I INTS VDD Disk Change. Indicates if the drive door was opened. HDSEL 58 O OD12,O6/12 VDD Head Select. Determines which side of the FDD is accessed. Active low selects side 1; inactive selects side 0. INDEX 72 I INTS VDD Index. Indicates the beginning of an FDD track. MSEN0 45 I INTS VDD Automatic Media Sense. Identifies the media type of the floppy disk in drives 1 and 0 (if the drives support this protocol). MTR0 71 O OD12,O6/12 VDD Motor Select. Motor enable lines for drives 0. RDATA59 I INTS VDD Read Data. Raw serial input data stream read from the FDD. STEP 64 O OD12,O6/12 VDD Step. Sends pulses to the disk drive at a software programmable rate to move the head during a seek operation. TRK0 61 I INTS VDD Track 0. Indicates to the controller that the head of the selected floppy disk drive is at track 0. WDATA63 O OD12,O6/12 VDD Write Data. Carries out the pre-compensated serial data that is written to the FDD. Pre-compensation is software selectable. WGATE 62 O OD12,O6/12 VDD Write Gate. Enables the write circuitry of the selected FDD. WP 60 I INTS VDD Write Protected. Indicates that the disk in the selected drive is write protected. Signal Pin(s) I/O Buffer Type Power Well Description |
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