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数据搜索系统，热门电子元器件搜索 |
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数据搜索系统，热门电子元器件搜索 |
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PC87366 数据表(PDF) 211 Page - National Semiconductor (TI) |
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PC87366 数据表(HTML) 211 Page - National Semiconductor (TI) |
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211 / 240 page  13.0 Legacy Functional Blocks (Continued) 211 www.national.com 13.2 FLOPPY DISK CONTROLLER (FDC) 13.2.1 General Description The generic FDC is a standard FDC with a digital data separator, and is DP8473 and N82077 software compatible. The FDC is implemented in this device as follows: q FM and MFM modes are supported. To select either mode, set bit 6 of the first command byte when writing to/read- ing from a diskette, where: 0 = FM mode 1 = MFM mode q Automatic media sense is not supported (MSEN0-1 pins are not implemented). q DRATE1 is not supported. q A logic 1 is returned for all floating (TRI-STATE) FDC register bits upon LPC I/O read cycles. 13.2.2 FDC Register Map Offset Mnemonic Register Name Type 00h SRA Status A RO 01h SRB Status B RO 02h DOR Digital Output R/W 03h TDR Tape Drive R/W 04h MSR Main Status R DSR Data Rate Select W 05h FIFO Data (FIFO) R/W 06h Reserved 07h DIR Digital Input R CCR Configuration Control W |
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