DS508PP5

(All Rights Reserved)

3

EP7312

High-Performance, Low-Power System on Chip

Table of Contents

FEATURES ...........................................................................................................................................1

OVERVIEW ...........................................................................................................................................1

Description of the EP7312’s Components, Functionality, and Interfaces ....................................6

Processor Core - ARM720T ..................................................................................................................................6

Power Management ..............................................................................................................................................6

MaverickKey™ Unique ID ......................................................................................................................................6

Memory Interfaces .................................................................................................................................................6

Digital Audio Capability .........................................................................................................................................7

Universal Asynchronous Receiver/Transmitters (UARTs) .....................................................................................7

Digital Audio Interface (DAI) ..................................................................................................................................7

CODEC Interface ..................................................................................................................................................8

SSI2 Interface ........................................................................................................................................................8

Synchronous Serial Interface ................................................................................................................................8

LCD Controller .......................................................................................................................................................8

64-Key Keypad Interface .......................................................................................................................................9

Interrupt Controller ................................................................................................................................................9

Real-Time Clock ....................................................................................................................................................9

PLL and Clocking ..................................................................................................................................................9

DC-to-DC Converter Interface (PWM) ................................................................................................................. 10

Timers ................................................................................................................................................................. 10

General Purpose Input/Output (GPIO) ................................................................................................................ 10

Hardware Debug Interface .................................................................................................................................. 10

LED Flasher ........................................................................................................................................................ 10

Internal Boot ROM ...............................................................................................................................................10

Packaging ............................................................................................................................................................ 10

Pin Multiplexing ................................................................................................................................................... 11

System Design ....................................................................................................................................................12

ELECTRICAL SPECIFICATIONS ......................................................................................................13

Absolute Maximum Ratings .................................................................................................................................13

Recommended Operating Conditions ................................................................................................................. 13

DC Characteristics .............................................................................................................................................. 13

Timings ...............................................................................................................................................15

Timing Diagram Conventions .................................................................................................................... 15

Timing Conditions ...................................................................................................................................... 15

SDRAM Interface ................................................................................................................................................ 16

SDRAM Load Mode Register Cycle .......................................................................................................... 17

SDRAM Burst Read Cycle ......................................................................................................................... 18

SDRAM Burst Write Cycle ......................................................................................................................... 19

SDRAM Refresh Cycle .............................................................................................................................. 20

Static Memory ..................................................................................................................................................... 21

Static Memory Single Read Cycle ............................................................................................................. 22

Static Memory Single Write Cycle ............................................................................................................. 23

Static Memory Burst Read Cycle ............................................................................................................... 24

Static Memory Burst Write Cycle ............................................................................................................... 25

SSI1 Interface ...................................................................................................................................................... 26

SSI2 Interface ...................................................................................................................................................... 27

LCD Interface ...................................................................................................................................................... 28