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Apparatus and method in a network interface device for asynchronously generating SRAM full and empty flags using coded read and write pointer values
Apparatus and method in a network interface device for asynchronously generating SRAM full and empty flags using coded read and write pointer values
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机译:网络接口设备中的设备和方法,用于使用编码的读写指针值异步生成SRAM满标志和空标志
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摘要
A network interface device includes a random access memory used as a transmit and receive buffer for transmission and reception of data frames between a host computer bus and a packet switched network. The network interface device includes read and write controllers for each of the transmit and receive buffers, where each write controller operates in a clock domain separate from the corresponding read controller. Read and write counters are each implemented as gray code counters that increment a corresponding pointer value by changing a single bit. A synchronization circuit selectively sets a full or empty flag based on an asynchronous comparison of the read and write pointer values. Use of gray code counters for the read pointer value and write pointer value ensures accurate comparisons in a multi-clock environment.
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