Maxim-integrated MAXQ622 Bedienungsanleitung PDF herunterladen (Seite 173)

MAXQ612/MAXQ622 User’s Guide

Maxim Integrated 12-3

12.2 USB SIE Features

The hardware SIE does most of the signaling work required by the USB protocol, such as the following:

1) Timing recovery based on the incoming data stream (differential receiver output)

2) USB packet PID detection and checking

3) CRC check and generation

4) USB packet generation

5) NRZI data encoding and decoding

6) Bit stuffing and unstuffing

7) Various USB error condition detection

8) USB bus reset, suspend, and wake-up detection

9) USB resume signaling

The following sections list the control registers dedicated to the USB SIE. Note that all USB pins are dedicated, and so

none of them are multiplexed with GPIO port pins.

Figure 12-3. USB SIE Block Diagram

VPO

VMO

VPI

VMI

RCV

MODE

SUSPEND

BUSACT

SOF

VBUSDET

ENCODER

PROTOCOL LOGIC

DPLL

EOP

DECODER

ENDPOINT BUFFER LOGIC

TO DUAL PORT—SRAM

TIMER

SIE

1 2 ... 168 169 170 171 172 173 174 175 176 177 178 ... 254 255

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Maxim-integrated MAXQ622 Bedienungsanleitung Seite 173