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LPC47N237-MD Datasheet(PDF) 65 Page - SMSC Corporation |
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LPC47N237-MD Datasheet(HTML) 65 Page - SMSC Corporation |
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65 / 138 page  3.3v I/O Controller for Port Replicators and Docking Stations SMSC DS – LPC47N237 Page 65 Revision 0.3 (10-26-04) DATASHEET Programmed I/O - Transfers from the Host to the FIFO In the forward direction an interrupt occurs when serviceIntr is 0 and there are writeIntrThreshold or more bytes free in the FIFO. At this time if the FIFO is empty it can be filled with a single burst before the empty bit needs to be re-read. Otherwise it may be filled with writeIntrThreshold bytes. writeIntrThreshold = (16-<threshold>) free bytes in FIFO An interrupt is generated when serviceIntr is 0 and the number of bytes in the FIFO is less than or equal to <threshold>. (If the threshold = 12, then the interrupt is set whenever there are 12 or less bytes of data in the FIFO.) The host must respond to the request by writing data to the FIFO. If at this time the FIFO is empty, it can be completely filled in a single burst, otherwise a minimum of (16-<threshold>) bytes may be written to the FIFO in a single burst. This process is repeated until the last byte is transferred into the FIFO. |
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