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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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STR720 датащи(PDF) 126 Page - STMicroelectronics |
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STR720 датащи(HTML) 126 Page - STMicroelectronics |
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126 / 401 page  STR720 - ATAPI-IDE INTERFACE 126/401 12 ATAPI-IDE INTERFACE 12.1 Introduction The ATAPI-IDE controller allows the STR720 to interface to up to 2 devices such as Hard Disk or CD-ROM drives. Communication over the IDE bus is performed in PIO mode only. IDE communication in DMA or UDMA modes is not supported. The STR720 initiates communication with the IDE device by writing IDE commands directly in the IDE registers. To save CPU time, the STR720 DMA controller may be used in “memory-to-memory” transfer mode to access the IDE registers. 12.2 Main Features The ATAPI-IDE controller supports the following features: • Primary-only channel, supporting up to two IDE devices • Support for CD-ROM and tape peripherals • Independently programmable timing for each device • Programmable posted writes and read-prefetch • Software selectable endianness for data read from CDROM / tape peripheral • Support for I/O Channel Ready • Support for PIO modes 0, 2, 3 and 4 • Variable IDE:AHB clock ratio 1 |
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