Lock and release mechanism for out-of-order frame prevention and support of native command queueing in FC-SATA
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United States of America Patent
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Nov 25, 2008
Grant Date -
Jan 24, 2008
app pub date -
Jul 21, 2006
filing date -
Jul 21, 2006
priority date (Note) -
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status (Latency Note)
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Abstract
A switch connection lock and release mechanism is disclosed to prevent out-of-order frames from being received by FC and/or SATA devices. The mechanism includes a set of previous AL_PA registers, alpa_reg[N:0], one for each port, and a bit vector, prev_conn[M:0], one bit for each Buffer Bank (BB). If a connection is closed prematurely, the valid AL_PA of the destination device and the source port number are stored in the previous AL_PA register associated with the destination port, and the bit in the bit vector associated with the source BB is asserted. Together, the valid AL_PA, the source port and the asserted bit form a connection lock on the destination port that effectively will deny access to the destination port to all BBs with the same destination AL_PA and source port number except the source BB.
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