LPC47N237-MD datasheet(65/138 Pages) SMSC

tên linh kiện	LPC47N237-MD

Giải thích chi tiết về linh kiện	3.3V I/O CONTROLLER FOR PORT REPLICATORS AND DOCKING STATIONS

PDF	138 Pages

Scroll/Zoom	100%

nhà sản xuất	SMSC [SMSC Corporation]

Trang chủ	http://www.smsc.com

Logo

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.

LPC47N237-MD bảng dữ liệu(PDF) 65 Page - SMSC Corporation