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28 CY4672 Reference Design Guide, Document # 001-16968 Revision **
WirelessUSB™ Protocol 2.2
Figure 2-7. Reconnect Timing Diagram
2.5 Signature Byte
The PRoC LP RDK uses the Signature byte to determine if the HID has ever been bound to any
bridge before.
If the HID has never bound to a bridge, the non-volatile memory used to store the signature and the
bridge's MID data remains in its default value. Once the HID has bound to a bridge, the Signature
byte is set to 0x90 and the bridge's MID is also stored.
At power up, the HID reads the Signature and the MID bytes to determine its next action. If the Sig-
nature byte is 0x90, the HID uses the retrieved MID to calculate the networkID and moves to Re-
connect mode. If the Signature byte is not 0x90, the HID goes to sleep, waiting for the user to initiate
the bind process.
Reconnect
Mode
Reconnect
Mode
Reconnect
Mode
430 ms
Reconnect
Mode
Keyboard = 5 seconds; Mouse = 2 seconds
Inherence detected .
Move to a quieter
channel in the subset
Quiet channel found. Bridge will stay on this channel
Device lost connection .
Search for bridge in
the channel subset
Cycle 1 Cycle 2 Cycle 3 Cycle 19
22.88 ms
22.88 ms x 19 Cycles ~ 430 ms
1
st
Channel
in subset
2
nd
Channel
in subset
3
th
Channel
in subset
13
th
Channel
in subset
1.76 ms 1.76 ms 1.76 ms
1.76 ms x 13 Channels = 22.88 ms
Bridge
Device
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