SPEAR300 datasheet(26/83 Pages) STMICROELECTRONICS

26 / 83 page

Architecture overview

SPEAr300

26/83

Doc ID 16324 Rev 2

2.26

USB2 device controller

Main features:

●

Supports the 480 Mbps high-speed mode (HS) for USB 2.0, as well as the 12 Mbps

full-speed (FS) and the 1.5 Mbps low-speed (LS modes) for USB 1.1

●

Supports 16 physical endpoints, which can be assigned to different interfaces and

configurations to implement logical endpoints

●

Integrated USB transceiver (PHY)

●

Local 4 Kbyte FIFO shared by all endpoints

●

DMA mode and slave-only mode are supported

●

In DMA mode, the UDC supports descriptor-based memory structures in application

memory

●

In both modes, an AHB slave is provided by UDC-AHB, acting as programming

interface to access to memory-mapped control and status registers (CSRs)

●

An AHB master for data transfer to system memory is provided, supporting 8, 16, and

32-bit wide data transactions on the AHB bus

●

A USB plug detect (UPD) which detects the connection of a cable.

2.27

JPEG (CODEC)

SPEAr300 provides a JPEG CODEC with header processing (JPGC), able to decode (or

encode) image data contained in the RAM memory, from the JPEG (or MCU) format to the

MCU (or JPEG) format.

Main features:

●

Compliance with the baseline JPEG standard (ISO/IEC 10918-1)

●

Single-clock per pixel encoding/decoding

●

Support for up to four channels of component color

●

8-bit/channel pixel depths

●

Programmable quantization tables (up to four)

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Programmable Huffman tables (two AC and two DC)

●

Programmable minimum coded unit (MCU)

●

Configurable JPEG headers processing

●

Support for restart marker insertion

●

Use of two DMA channels and of two 8 x 32-bits FIFO’s (local to the JPEG) for efficient

transferring and buffering of encoded/decoded data from/to the CODEC core.

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