User`s guide

Aironet Wireless Communications, Inc. 7-14 Confidential and Proprietary
The event descriptions related to the register bits are:
Event Associated
Registers
Description
Awake None – PSP
mode
This bit is used only in power save mode.
Awake event is issued in response to an EvAck.Awaken.
To allow for maximal power saving, the host must inform the PC4500/4800
that the host will no longer access the PC4500/4800. To leave this mode, the
host must issue an EvAck.Awaken and then wait for EvStat.Awake. After
EvStat.Awake, the PC4500/4800 is normally accessible.
Link LinkStatus Indicates that a LinkStatus word is available.
Acknowledge allows the PC4500/4800 to issue the next link status.
Read LinkStatus before acknowledging.
Cmd Status
Resp0
Resp1
Resp2
Indicates that a command has completed and that its completion response is
available .
Acknowledge allows PC4500/4800 to issue next response.
For transmit, this only indicates that the transmission has been queued, a
subsequent EvStat.Tx or EvStat.TxExc will indicate the success or failure.
Alloc TxAllocFid Indicates that a TxAllocFID is available (Alloc command completed).
Acknowledge allows PC4500/4800 to issue next Alloc command;
Read TxAllocFID before acknowledging.
TxExc TxComplFid Indicates that a TxComplFID is available and that the transmission was
unsuccessful.
Read the FID and access the status (cause of failure) before acknowledging.
Acknowledging allows the PC4500/4800 to issue the next
TxComplFid. Acknowledging will release the TxComplFid to the free pool or
return the FID to host control (if TxControl.NoRelease was set).
TX TxComplFid Indicates that a TxComplFID is available and that the transmission was
successful.
Read the FID and access the status (cause of failure) before acknowledging.
Acknowledging allows the PC4500/4800 to issue the next
TxComplFid. Acknowledging will release the TxComplFid to the free pool or
return the FID to host control (if TxControl.NoRelease was set).
RX RxFid Indicates that a RxFID is available
Acknowledge releases the RxFID to the free pool. Read the FID before
acknowledging.
Additional information:
Link – occurs when the connection control status has changed and the LinkStat register contains related
status qualification information. This event occurs again if subsequent connection control status
information is already available when the current event occurrence is acknowledged.
Each event may occur again after being acknowledged if another occurrence of the event is pending.
An event should only be acknowledged after the relevant information has been processed.
Acknowledging the event first may result in the associated information being purged before the host is
able to access it.
The EvAck.ClearCommandBusy provides a mechanism for clearing a stuck command busy bit. A
hardware errata will result in the Command.Busy bit not being cleared if the PC4500/4800 attempts to
clear the Command.Busy at the same time as the host reads the Command register. The result is that no
further commands can ever be issued. A work-around is available by setting the
EvAck.ClearCommandBusy. After receiving this, the PC4500/4800 firmware will again attempt to clear
the Command.Busy bit
(provided that it isn't actually processing a command).