Specifications

MOVE Coprocessor

6.1 About the MOVE Coprocessor

The MOVE coprocessor is a video encoding acceleration coprocessor designed to

accelerate Motion Estimation (ME) algorithms within block-based video encoding

schemes such as MPEG4 and H.263. This is done by providing support for the

execution of Sum of Absolute Differences (SAD) calculations, which account for most

of the processing activity within an ME algorithm. These algorithms require many

comparisons between 8x8 pixel blocks to be made between a current frame and a

reference frame.

The MOVE interprets a set of coprocessor instructions that are part of the ARM

instruction set. The ARM coprocessor instructions enable the ARM processor to:

• transfer data between the MOVE and memory, using Load Coprocessor

instructions (

LDC

)

• transfer data between the MOVE and ARM registers, using MOVE to coprocessor

instructions (

MCR

), and MOVE to ARM instructions (

MRC

The ARM processor acts as an address generator and data pump for the MOVE. The

MOVE consists of:

• a register bank

• a data path

• control logic.

Figure 6-1 on page 6-3 shows the major blocks of the MOVE.