AT89C5132-ROTIL datasheet(69/182 Pages) ATMEL

69 / 182 page

4173E–USB–09/07

AT89C5132

generator and its calculation formula. The USB controller clock frequency must always be 48

MHz.

Figure 15-3. USB Clock Generator and Symbol

15.1.2

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 15-4. SIE Block Diagram

USBCD1:0

USBCLK

48 MHz USB Clock

USBclk

PLLclk

U SBCD

--------------------------------

USB

CLOCK

USB Clock Symbol

PLL

CLOCK

Start of Packet

Detector

Clock

Recover

SYNC Detector

PID Decoder

Address Decoder

Serial to Parallel

Converter

CRC5 & CRC16

Generator/Check

USB Pattern Generator

Parallel to Serial Converter

Bit Stuffing

NRZI Converter

CRC16 Generator

NRZI ‘ NRZ

Bit Unstuffing

Packet Bit Counter

End of Packet

Detector

USB

CLOCK

48 MHz

SysClk

Data In

D+

D-

(12 MHz)

Data Out

AT89C5132-ROTIL Datasheet(PDF) 69 Page - ATMEL Corporation

AT89C5132-ROTIL Datasheet(HTML) 69 Page - ATMEL Corporation

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