Nec Network Controller uPD98502 Manual do Utilizador descarregar pdf (Página 28)

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CHAPTER 1 INTRODUCTION

Preliminary User’s Manual S15543EJ1V0UM

1.5.3 System controller

System Controller is

PD98502’s internal system controller. System Controller provides bridging function among

the VR

4120A System Bus “SysAD”, NEC original high-speed on-chip bus “IBUS” and memory bus for

SDRAM/PROM/Flash.

Features of System Controller are as follows;

• Implements 4-word prefetch FIFO buffer between SysAD and Memory

• Implements 32-bit×64-word FIFO buffer for each Tx and Rx to IBUS

• Implements 32-bit× 4-word FIFO buffer for each Tx and Rx to HBUS

• Provides bus bridging function among SysAD bus and IBUS (internal bus) and Memory

• Supports Endian Converting function on SysAD bus

• Can directly connect SDRAM (MAX. 32 MBytes) and PROM/Flash (MAX. 8 MBytes) memory

• Supports all V

4120A bus cycles at 66 MHz or 100 MHz

• PROM/Flash data signals multiplexed on SDRAM data signals

• Supports 266-MB/sec (32 bits @66 MHz) bursts on IBUS

• Generates NMI and INT

• Supports NS16550 compatible Universal Asynchronous Receiver/Transmitter (UART)

• Supports separated 2-ch Timer

• Supports Deadman’s Switch Unit (Watch Dog Timer)

• Supports Micro Wire interface

Figure 1-5. Block Diagram of System Controller

System Controller

IBUS

SysAD BUS

PHB

PBUS-HBUS Bridge

PFUR

FAST-UART

HARB

HBUS Arbiter

IHB

IBUS-HBUS Bridge

Flash

PROM

SDRAM

RS-232C/Micro Wire

HBUS

PBUS

ROM-IF

SDRAM-IF

System

Bridge

Memory

Arbitor

HBUS

MIF HIF

VRIF

DSU

TIMER

1 2 ... 23 24 25 26 27 28 29 30 31 32 33 ... 594 595

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