CX82100 Home Network Processor Data Sheet
8.1
UDC Data Path
The UDC data path supports USB transmit and receive data.
8.1.1
USB Transmit Data Path (Endpoint IN Channel)
The USB transmit data flow is illustrated in Figure 8-2.
Figure 8-2. USB Transmit Data Flow
data
payload
CRC16
complete
packet
from APB/
DMA I/F
Data
Buffer
Data +
CRC16
UBL
to USB
Differential
Transceiver
M
U
X
Token
Assembly
Bit
Stuffing
NRZ-to-NRZI
Conversion
HandShake
Generator
IN,
OUT,
SOF,
SETUP
ACK,
NAK,
STALL
bit
stuffing
0
1
1
0
1
0
1
1
1
1
1
1
0
1
1
NRZ
NRZ
to
NRZI
conversion
NRZI
+
-
0 = inverting the polarity of the output signal
1 = not inverting the output signal
101545_055
101306C
Conexant Proprietary and Confidential Information
8-3
CONEXANT [ CONEXANT SYSTEMS, INC ]
