CY4636 WirelessUSB™ LP Keyboard Mouse Reference Design Kit User Guide, Doc. # 001-70355 Rev. *A
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4.
Hardware
4.1
Bridge
The WirelessUSB LP HID bridge is provided with the CY4636 WirelessUSB™ LP Keyboard-Mouse
Reference Design Kit. This bridge may be plugged into the USB port on a PC to provide Wireless
USB bridge functionality. The CY4636 RDK uses an enCoRe II controller for the LP RDK bridge. The
architecture is designed to be modular for extendability and maintainability. It can also be easily
ported from one hardware platform to another assuming the use of an enCoRe II microprocessor
with USB hardware support. Porting to another microprocessor requires more work to account for
the USB hardware support and other hardware specific changes.
Design efforts have been made to reduce the ‘ON’ time of the microprocessor and radio to conserve
battery life of attached devices. This includes protocol optimizations along with using sleep features
of the radio and enCoRe II microprocessor.
The bridge connects the remote WirelessUSB LP HIDs to a low-speed USB host. This firmware sup-
ports 2-way communication with the bridge and HID devices configured as transceivers. Packets
similar to standard USB HID packets are encapsulated inside WirelessUSB LP packets, which also
contain a packet header and CRC to help the bridge correctly process the USB HID data packets.
Valid packets are then sent through USB to the USB host.
Figure 4-1. Bridge Block Diagram
Chip
CY7C63803
Chip CYRF6936
Bind Button
USB A
Connector
12 MHz
Oscillator
LEDs
Antenna