User Manual

1-2 EP7309/11/12 User’s Manual - DS508UM4

Introduction

• Two 16-bit g eneral purpose timer counters

• 32-bit RTC (Real-Time-Clock) timer and comparator

• Dedicated LED flasher pin driven from the RTC with programm able duty

ratio (Multiplexed with GPIO pin)

• Two synchronous s erial interfaces for Micro-wire or SPI interfaces such as

ADCs, one supporting both the master and slave and other supp orting

only master mode.

• Two programmable PWM (Pulse Width Modulation) i nterfaces

• SDRAM i nterface for direct interface to a m a ximu m of two external ba nks

of SDRAM memory. Each bank can be up to 256 Mbit i n size and

configurable for 32 or 16-bit wide accesses.

• PLL (Phase Lock Loop) oscillator f or generating core speeds of 18-90 MHz

from an external 3.6864 M Hz crystal.

• Low power 32.768 kHz RTC (Real Time Clock)

• MaverickKey - Uniqu e and Random ID s for SDMI compliance

Memory Map and Register List

The lower 2 GByte of th e address space is allocated to memory. The 64 MBy te of

address space from 0xC000.0000 to 0xCFFF.FFFF is allocated to SDRAM. About

1.5 GBytes of address space, less 8 Kbytes for internal r egisters, is not accessible in the

EP73xx. The MMU in the E P73xx should be programmed to generate an abort

exception for access to this area.

Internal peripherals are addressed through a set of internal memory locations from

hex address 0x8000.0000 to 0x8000.3FFF. Th ese are known as the internal registers in

the EP73xx. In Table 1-1 also shows how the 4-Gbyte address range of the A RM 720T

processor (as configured within this chip) is mapped in the EP73xx. The external boot

ROM is not f ully decoded (i .e., th e boot code will repeat within the 256-Mby te space

from 0x7000.0000 to 0x8000.0000). See Tab le 6-1 o n page 6-2 for the memory map

when booted from on-chip boot ROM . The SR A M is fully decoded up to a maximum

size of 48 Kbytes. Ac cess to any location above this ran ge will be wrapped to within

the range.

Global Memory Map

Table 1-1: EP73xx Memory Map in External Boot Mode

Address Contents Size

0xF000.0000 Reserved 256 Mbytes

0xE000.0000 Reserved 256 Mbytes

0xD000.0000 Reserved 256 Mbytes

0xC000.0000 SDRAM 64 Mbytes