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CY4672 Reference Design Guide, Document # 001-16968 Revision ** 27
WirelessUSB™ Protocol 2.2
Figure 2-6. Bind Timing Diagram
The bridge uses the RSSI to determine the noise level on the channel. If the channel has become
noisy, the bridge moves to ping mode to find a quieter channel in its channel subset.
When the HID loses connection with the bridge, it moves to reconnect mode to find the bridge. The
HID sends a connect request packet and listens for an AutoACK packet. If the HID receives the
AutoACK, it immediately enables its receiver and listens for the connect response packet from the
bridge. If the HID does not receive the AutoACK it selects the next channel using the channel selec-
tion algorithm and repeats this procedure. As shown in the reconnect timing diagram below, the
reconnect attempt takes approximately 1.76 ms/channel. The HID moves through its channel subset
up to 19 times before it times out and exits reconnect mode. The keyboard tries to send the data for
up to five seconds, and the mouse tries for two seconds, causing the HID to re-enter reconnect
mode multiple times if necessary.
Cycle 1 Cycle 2 Cycle 3
23.4 ms
Cycle 1000
23.4 ms x 1000 Cyles = 23.4 seconds
Bridge
Device
Channel 0 Channel 6 Channel 12 Channel 78
1.8 ms 1.8 ms 1.8 ms
1.80 ms x 13 Channels = 23.4 ms
Cycle 1 Cycle 2 Cycle 3 Cycle 4 Cycle 5
4.16 s
4.16s x 5 Cycles ~ 21 seconds
Channel 0 Channel 6 Channel 12 Channel 72
320 ms 320 ms 320 ms
320 ms x 13 Channels ~ 4.16 seconds
Channel 78
Cycle 999
Channel 72
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