Xilinx XAPP169 System Implementation

12 www.xilinx.com XAPP169 (v1.0) November 24, 1999

1-800-255-7778

MP3 NG: A Next Generation Consumer Platform R

System

Implementation This section describes how all of these pieces are integrated into a com plete system. First

described is the software architecture and the functionality of the key module s. Next is the

architecture and implementation of the logic contained in the Spartan-II FPG A.

The system software required to implement this device is shown in F igure 14. The software

components fall into four categories:

•RTOS. A Real Time Operating System is included in the software architecture in order to

simplify the management of resources and concurrent activities.

•BIOS. The Basic Input Output System functions provide low level device managemen t

functions and hardware abstraction.

•Protocol Stacks. These modules implement the network protocol layer s for the

communications interfaces.

•Management Processes. These modules implement the application levels functions, and

these run as processes under the RTOS.

ALE

AD[7:0] DATA

RD or WR

ADDR

Figure 13: USBN9602 Read / Write Cycle Timing

(Courtesy National Semiconductor)