Maintaining dynamic count of FIFO contents in mult

专利名称：Maintaining dynamic count of FIFO contents

in multiple clock domains

发明人：John Udell,Richard Solomon,Eugene

Saghi,Jeffrey K. Whitt

申请号：US12058964申请日：20080331公开号：US07646668B2公开日：20100112

专利附图：

摘要：Disclosed is a system that generates a write count value for indicating whetherdata can be read from a FIFO and a system that generates a read count value for

indicating whether data can be written to a FIFO. Each of these systems operates in twoseparate clock domains. In the system that generates a write count value, write strobesare stored in parallel in a register in a first clock domain. The plurality of synchronizerstrigger on a rising edge of the write strobe that is stored in the parallel register andgenerate an increment pulse in a second clock domain. An up/down counter reads theincrement pulse in parallel and increments the up/down counter in parallel. A decrementsignal from a read strobe decrements the up/down counter. The output of the counter isfed to a register that provides a write counter value to handshake logic that indicateswhether data can be read from a FIFO without underflowing the FIFO.

申请人：John Udell,Richard Solomon,Eugene Saghi,Jeffrey K. Whitt

地址：Colorado Springs CO US,Colorado Springs CO US,Colorado Springs COUS,Colorado Springs CO US

国籍：US,US,US,US

代理机构：Cochran Freund & Young LLC

代理人：William W. Cochran

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