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PC8477BVF-1 Datasheet(PDF) 4 Page - National Semiconductor (TI) |
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PC8477BVF-1 Datasheet(HTML) 4 Page - National Semiconductor (TI) |
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4 / 54 page  10 Introduction The PC8477B advanced floppy disk controller is suitable for all PC-AT EISA PS2 and general purpose applications The operational mode (PC-AT PS2 and Model 30) of the PC8477B is determined by hardware strapping of the IDENT and MFM pins DP8473 and Intel 82077AA software com- patibility is provided Key features include the 16 byte FIFO PS2 diagnostic register support the perpendicular record- ing mode CMOS disk interface and a high performance analog data separator The PC8477B supports the standard PC data rates of 250 300 500 kbs and 1 Mbs in MFM encoded data mode but is no longer guaranteed through functional testing to sup- port the older FM encoded data mode References to the older FM mode remain in this document to clarify the true functional operation of the device The 1 Mbs data rate is used by new high performance tape and floppy drives emerging in the PC market today The new floppy drives utilize high density media which requires the PC8477B supported perpendicular recording mode format When used with the 1 Mbs data rate this new format allows the use of 4 Mb floppy drives which format ED media to 288 MB data capacity The high performance internal analog data separator needs no external components It improves on the window margin performance standards of the DP8473 and is compatible with the strict data separator requirements of floppy and floppy-tape drives The PC8477B contains write precompensation and circuitry that will default to 125 ns for 250 300 and 500 kbs 4167 ns at 1 Mbs These values can be overridden through software to disable write precompensation or to provide levels of precompensation up to 250 ns The PC8477B has internal 12 mA data bus buffers which allow direct connection to the system bus The internal 48 mA totem-pole disk interface buffers are compatible with both CMOS drive inputs and 150X resistor terminated disk drive inputs The PC8477B is available in a 68 pin Plastic Leaded Chip Carrier (PLCC) package and in a 60 pin Plastic Quad Flat Package (PQFP) 4 |
Similar Part No. - PC8477BVF-1 |
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Similar Description - PC8477BVF-1 |
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