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AFC=average fixed cost 平均不变成本 :是厂商在短期内平均每生产一单位产品所消耗的不变成本。
固定成本?
3.计算机嵌入式领域
编辑本义项
求助编辑
afc
AFC(Auto Flow Control):自动流控制。S3C44BoX中的UART用nRTS(发送请求信号)和nCTS(清除发送信号)来支持自动流控制,以此实现UART之间的互联。
The S3C2440A's UART 0 and UART 1 support auto flow control with nRTS and nCTS signals. In case, it can be
connected to external UARTs. If users want to connect a UART to a Modem, disable auto flow control bit in
UMCONn register and control the signal of nRTS by software.
In AFC, nRTS depends on the condition of the receiver and nCTS signals control the operation of the transmitter.
The UART's transmitter transfers the data in FIFO only when nCTS signals are activated (in AFC, nCTS means
that other UART's FIFO is ready to receive data). Before the UART receives data, nRTS has to be activated when
its receive FIFO has a spare more than 32-byte and has to be inactivated when its receive FIFO has a spare under
32-byte (in AFC, nRTS means that its own receive FIFO is ready to receive data). |
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