AT83SND2CMP3_0605 Datasheet, PDF (46/97 Pages) ATMEL Corporation – Single-Chip MP3 Decoder with Full Audio Interface

Serial Interface Engine (SIE)
The SIE performs the following functions:
• NRZI data encoding and decoding.
• Bit stuffing and unstuffing.
• CRC generation and checking.
• ACKs and NACKs automatic generation.
• TOKEN type identifying.
• Address checking.
• Clock recovery (using DPLL).
Figure 31. SIE Block Diagram
End of Packet
Detector
Start of Packet
Detector
SYNC Detector
NRZI ‘ NRZ
Bit Unstuffing
Packet Bit Counter
PID Decoder
D+
Address Decoder
Serial to Parallel
8
D-
Converter
USB 48 MHz
CLOCK
Clock
Recover
SysClk
(12 MHz)
CRC5 & CRC16
Generator/Check
USB Pattern Generator
Parallel to Serial Converter
Bit Stuffing
8
NRZI Converter
CRC16 Generator
Data In
Data Out
46 AT83SND2CMP3
7524B–MP3–05/06