Owner's manual

DS508F2 Copyright Cirrus Logic, Inc. 2011
(All Rights Reserved) 3
EP7312
High-Performance, Low-Power System on Chip
Table of Contents
FEATURES ...........................................................................................................................................1
OVERVIEW ...........................................................................................................................................1
FEATURES (cont) .......................................................................................................................................................2
OVERVIEW (cont.) ......................................................................................................................................................2
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