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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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PC87332 датащи(PDF) 81 Page - National Semiconductor (TI) |
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PC87332 датащи(HTML) 81 Page - National Semiconductor (TI) |
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81 / 98 page  80 Integrated Device Electronics Interface (IDE) (Continued) The two ’LS245 chips are used to enable or TRI-STATE the data bus signals In the PC-AT mode the PC87332 provides the two hard disk chip selects (HCS0 HCS1) for the IDE interface The HCS0 output is active low when the 1F0 – 1F7h IO address space is chosen and corresponds to the 1FX signal on the IDE header The HCS1 output is active low when the 3F6 or 3F7 IO addresses are chosen and corresponds to 3FX on the IDE header These are the two address blocks used in the PC-AT hard disk controller Table 8-1 summarizes the addresses used by the PC-AT hard disk controller The equations shown in Figure 8-1 define the signals of the PC87332 IDE pins TABLE 8-1 IDE Registers and Their ISA Addresses Address Read Function Write Function 1F0 Data Data 1F1 Error Features (Write Precomp) 1F2 Sector Count Sector Count 1F3 Sector Number Sector Number 1F4 Cylinder Low Cylinder Low 1F5 Cylinder High Cylinder High 1F6 DriveHead DriveHead 1F7 Status Command 3F6 Alternate Status Device Control 3F7 Drive Address Not Used (Note) Data Bus TRI-STATE Note Data bus bit D7 is dedicated to the floppy disk controller at this ad- dress When reading this address the floppy disk controller disk change status will be provided by bit D7 There is no write function at this address in the IDE associated with this bit Equations Comments HCS0 e A9 A8 A7 A6 A5 A4 A3 AEN Active at 1F0 – 1F7 HCS1 e A9 A8 A7 A6 A5 A4 A3 A2 A1 AEN Active at 3F6 3F7 IDELO e HCS0 (RD a WR) a HCS1 (WR A0) a RD Write 1F0 – 1F7 3F6 Read 1F0 – 1F7 3F6 3F7 IDEHI e IOCS16 HCS0 (RD a WR) Read or Write 1F0 – 1F7 in AT Mode IDED7 (read) e (HCS0 RD) a (HCS1 A0) RD Provides D7 during Read 1F0 – 1F7 and 3F6 IDED7 (write) e WR HCS0 a (HCS1 A0) Provides D7 during Write 1F0 – 1F7 and 3F6 FIGURE 8-1 IDE Interface Signal Equations (Non-DMA) 81 |
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