UM0851 datasheet(153/245 Pages) STMICROELECTRONICS

153 / 245 page

UM0851

Accelerator engine device drivers

Doc ID 16604 Rev 2

153/245

Figure 40.

JPGC block diagram

The main features of the JPGC are:

●

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

●

Single-clock per pixel encoding/decoding

●

Support for four channel interface: Pixel In, Compressed Out, Compressed In, Pixel

Out

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8-bit/channel pixel depths

●

Programmable quantization tables (up to four)

●

Programmable Huffman tables (two AC and two DC)

●

Programmable Minimum Coded Unit (MCU)

●

Configurable JPEG headers processing

●

Support for restart marker insertion

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Chunk by chunk processing of data at source and destination side

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Use of two DMA channels and two 8 x 32-bits FIFOs (local to the JPGC) for efficient

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

●

Output decoded data is in the MCU format. It is neither planar nor interleaved.

6.1.2

Software overview

The JPEG controller driver supports both JPEG encoding and decoding with/without header

processing enabled. It acts as an interface between user level applications and the JPEG

codec. JPEG driver provides a char device interface to the user application and can be used

from user level only. JPEG driver accepts (for encoding) and gives (for decoding) data in

MCU format.

The overall JPEG codec software system architecture is shown in Figure 41 below.

DM A C

CODE C

Co n tro lle r

FIFO

Ou t

CO D E C

Co re

In te rn a l me mo rie s

AH B M a s te r

AH B Sla v e

AH B Bu s

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