LPC47M112-MW Standard Microsystems (SMSC), LPC47M112-MW Datasheet - Page 98
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LPC47M112-MW
Manufacturer Part Number
LPC47M112-MW
Description
Manufacturer
Standard Microsystems (SMSC)
Datasheet
1.LPC47M112-MW.pdf
(204 pages)
Specifications of LPC47M112-MW
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Enhanced Super I/O Controller with LPC Interface
Datasheet
Programmed I/O - Transfers from the FIFO to the Host
In the reverse direction an interrupt occurs when serviceIntr is 0 and readIntrThreshold bytes are available in the FIFO.
If at this time the FIFO is full it can be emptied completely in a single burst, otherwise readIntrThreshold bytes may be
read from the FIFO in a single burst.
ReadIntrThreshold =
An interrupt is generated when serviceIntr is 0 and the number of bytes in the FIFO is greater than or equal to (16-
<threshold>). (If the threshold = 12, then the interrupt is set whenever there are 4-16 bytes in the FIFO). The host must
respond to the request by reading data from the FIFO. This process is repeated until the last byte is transferred out of
the FIFO. If at this time the FIFO is full, it can be completely emptied in a single burst, otherwise a minimum of (16-
<threshold>) bytes may be read from the FIFO in a single burst.
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 =
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.
SMSC DS – LPC47M112
(16-<threshold>) data bytes in FIFO
(16-<threshold>) free bytes in FIFO
DATASHEET
Page 98
Rev. 02-16-07
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