MN85571AC

2

SDD00023AEM

s Block Diagram

The MN85571AC consists of the 5 blocks listed below.

1. Video encoder block. This block is based on the MN85560 MPEG2 video encoder, but provides additional

functionality as well.

2. Audio encoder block. This block is based on the MN67735JA Dolby Digital encoder core.

3. Multiplexer block. This block multiplexes the encoded video and audio data.

4. SDRAM interface block (MIF). This block handles data exchange with external SDRAM.

5. Host interface block (HIF). This block handles data exchange with and accepts control commands from an exter-

nal host.

Note) The MN85571AC includes two RISC microcontrollers (for video encoding and data multiplexing) and one DSP for audio

encoding. The microcode for these two RISC microcontrollers must be downloaded to the on-chip instruction memory before

the MN85571AC is used. The DSP microcode is stored in on-chip ROM, and does not need to be downloaded.

4. MIF

2. Audio encoder

block

3. Multiplexer

block

ADIN

DSP

ASF

CBUS

Startup

ABUS

CIF

5. HIF

PCKI

1. Video encoder block

VIN

VCLK

(27 MHz)

PCKO

LRCKIO

BCKIO

AMAS

SCLK

(27 MHz)

PLL

108 MHz

36 MHz

ERISC

SYSENC

SRISC

DIF

32

14

CDO

8

RMRS

HCIFZ

RCLKO

RCLKI

CDACK

CDREADY

IPIC

VOB

16

8

Startup