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EP7312-CB

High-performance, Low-power, System-on-chip with SDRAM & Enhanced Digital Audio Interface

Cirrus Logic 

Table of Contents

EP7312

High-Performance, Low-Power System on Chip

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 .......................................................................................................................................8

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

JTAG Interface .....................................................................................................................................................29

DS508F1

©Copyright Cirrus Logic, Inc. 2005

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