Rev. 3.0, 03/01, page 299 of 390
Serializer
The Serializer performs the parallel/serial conversion for both transmitting and receiving. The logic
consists of a packet control state machine, 8-bit parallel-load/serial-shift register, 8-bit data latch,
PID encoder/decoder, CRC generator/checker, bit stuff counter, NRZI encoder, and data receiver
circuit. Data paths of transmitted and received paths share logic since the bus only operates one
direction at a time and the path's logical organizations are simply reversed.
0
1
Packet Control
load
shift
dir
crc_sel
crc_en
0
1
Bit Stuff
Control
RxD
TxD
stuff
in_data[7:0]
Data
Latch
en
Data
Receiver
8-bit shift register
ld
en
out
in
CRC Generator
token_sel
crc_check
PID
Decoder
ack
stall
data0
nack
pid_check
data1
NRZI
Control
Figure 18.13 Serializer
Summary of Contents for HD64465
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