The channel count is the amount of data waiting to be read (for read channels), or the amount of data which can still be written (for write channels).

信道数是等待被读取的数据量(对于读信道而言)或仍能被写入的数据量(对于写信道而言)。

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The SPU has a read channel for receiving a single data word from the mailbox and two write channels for sending data words (more on this below).

SPU有一个读通道来从邮箱接收单个数据字，有两个写通道来发送数据字(更详细的介绍请参看下文)。

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Each channel has a predefined function and is either a read channel or a write channel.

每个通道都是一个预定义的函数，它可能是一个读通道，也可能是一个写通道。

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