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CY4672 Reference Design Guide, Document # 001-16968 Revision ** 21
WirelessUSB™ Protocol 2.2
Figure 2-5. Back Channel Transaction Sequence
Bridge
Device 1
Device 2
BCD=1
Auto ACK
Data
CRC Seed = A,A
CRC Seed = !A,A
CRC Seed = A,A
CRC Seed = !A,A
BCD=1
CRC Seed = A,A
CRC Seed = A,A
CRC Seed = !A,A
CRC Seed = A,A
Device 1 and
bridge do not
respond to device
2 due to seed
missmatch
Data
CRC Seed = !A,A
BCD=1
D
e
l
a
y
R
X
Data
CRC Seed = A,A
CRC Seed = !A,A
CRC Seed = A,A
CRC Seed = !A,A
Data
CRC Seed = !A,A
CRC Seed = !A,A
BCD=1
Device 1 checks
for back channel
data
Device 2 transmits
when device 1 is
looking for back
channel data
Dongle indicates
that it has more
data to send
Auto ACK
Auto ACK
Auto ACK
Auto ACK
Auto ACK
Auto ACK
R
X
R
X
R
X
D
e
l
a
y
D
e
l
a
y
D
e
l
a
y
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