AT90SCR100 datasheet(158/433 Pages) ATMEL

158 / 433 page

158

TPR0327AY–SMS–30Jan09

AT90SCR100

Figure 14-1.

USB Module Diagram

The USB module of the AT90SCR100 is made up of the following elements:

• The USB Transceiver: it is the electrical and physical interface between the USB Bus and

the internal logic of the AT90SCR100.

• The USB Serial Interface Engine: this logical part manages the NRZI coding/decoding, the

bit stuffing/unstuffing, the CRC generation/checking and the serial-parallel data conversion

as requested by the USB specifications.

• The Universal Function Interface: this block is the interface between the data flow and the

internal Dual Port RAM of the USB module that contains the endpoints.

• The DPRAM block: the Dual Port RAM is an internal block of the USB module. It contains

the seven available endpoints and can be accessed either by the SIE or the UFI. It is

intended to be used as a buffer between the USB bus and the internal data bus of the

AT90SCR100.

• The USBDMA Controller: the Direct Memory Access logical module allows fast data

transfers from the DPRAM to the RAM of the AT90SCR100. See “USBDMA Controller” on

page 172.

USB MODULE

USB

Transceiver

USBDM

(D-)

USBDP

(D+)

USB SIE

(Serial Interface

Engine)

Clock

and

Suspend

Resume

Manager

XIN

XOUT

USB UFI

(Universal

Function

Interface)

USBDMA

Controller

Data

Exchanges

USB Control

and Status,

USB Interrupt,

...

DPRAM

Endpoint 0

Endpoint 3

Endpoint 2

Endpoint 1

64 Bytes

2x64 Bytes

Endpoint 4

8 Bytes

Endpoint 5

8 Bytes

Endpoint 6

Endpoint 7

8 Bytes

AT90SCR100 Datasheet(PDF) 158 Page - ATMEL Corporation

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