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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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DP83916 датащи(PDF) 51 Page - National Semiconductor (TI) |
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DP83916 датащи(HTML) 51 Page - National Semiconductor (TI) |
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51 / 96 page  50 Bus Interface (Continued) 53 SYSTEM CONFIGURATION Any device that meets the SONIC-16 interface protocol and electrical requirements (timing threshold and loading) can be interfaced to SONIC-16 Since two bus protocols are pro- vided via the BMODE pin the SONIC-16 can interface di- rectly to most microprocessors Figure 5-3 shows a typical interface to the NationalIntel style bus (BMODEe0) and Figure 5-4 shows a typical interface to the Motorola style bus (BMODEe1) The BMODE pin also controls byte ordering When BMODEe1 big endian byte ordering is selected and when BMODEe0 little endian byte ordering is selected 54 BUS OPERATIONS There are two types of system bus operations 1) SONIC-16 as a slave and 2) SONIC-16 as a bus master When SONIC-16 is a slave (eg a CPU accessing SONIC-16 reg- isters) all transfers are non-DMA When SONIC-16 is a bus master (eg SONIC-16 accessing receive or transmit buff- erdescriptor areas) all transfers are block transfers using SONIC-16’s on-chip DMA This section describes the SONIC-16 bus operations Pay special attention to all sec- tions labeled as ‘‘Note’’ These conditions must be met for proper bus operation TLF11722 – 25 FIGURE 5-3 SONIC-16 to NS32532 Interface Example 51 |
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