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All host transactions are of the following form:
1.
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Read mailbox control word from DSP;
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2.
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Read any parameters from the parameter area;
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3.
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Perform required actions;
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4.
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Write any results to the parameter area;
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5.
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Write mailbox reply control word to DSP.
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All DSP transactions are of the following form:
1.
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Write any parameters or data to the parameter area or PCI buffer;
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2.
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Send mailbox control word to host;
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3.
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Read mailbox reply control word;
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4.
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Transfer any data out of PCI buffer or parameter area.
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