EP7312 Data Sheet
ARM 720T Processor
ARM7TDMI CPU Operating at Speeds of 74 and
with SDRAM & Enhanced
Digital Audio Interface
8 kBytes of Four-way Set-associative Cache
MMU with 64-entry TLB
Thumb Code Support Enabled OVERVIEWOVERVIEW
Ultra low power
The Cirrus Logic EP7312 is designed for ultra-low-power
90 mW at 74 MHz Typical
portable and line-powered applications such as portable
108 mW at 90 MHz Typical
consumer entertainment devices, home and car audio juke box
systems, and general purpose industrial control applications, or
<.03 mW in the Standby State
any device that features the added capability of digital audio
Advanced Audio Decoder/decompression Capability
compression & decompression. The core-logic functionality of
Supports bit streams with adaptive bit rates.
the device is built around an ARM720T processor with
Allows for support of multiple audio decompression
8 kBytes of four-way set-associative unified cache and a write
algorithms (MP3, WMA, AAC, Audible, etc.).
buffer. Incorporated into the ARM720T is an enhanced
memory management unit (MMU) which allows for support of
sophisticated operating systems like Microsoft Windows
CE and Linux .
Interface PWM & GPIO
ARM7TDMI CPU Core
8 KB Write
Internal Data Bus
On-chip SRAM LCD
48 KB Controller
SRAM I/F SDRAM I/F
MEMORY and STORAGE
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High-Performance, Low-Power System on Chip
48 KBytes of On-chip SRAM Dedicated LED Flasher Pin from the RTC
Two 16550-compatible UARTs
32-bit unique ID can be used for DRM-compliant 128-
bit random ID.
Available in 74 and 90 MHz clock speeds.
Two PWM Interfaces
Interfaces directly to a single-scan panel monochrome
Two General-purpose 16-bit Timers
Interfaces to a single-scan panel color STN LCD with
minimal external glue logic.
Full JTAG Boundary Scan and Embedded ICE Support
Integrated Peripheral Interfaces
32-bit SDRAM Interface, Up to 2 External Banks
The fully static EP7312 is optimized for low power
8/32/16-bit SRAM/FLASH/ROM Interface
dissipation and is fabricated using a 0.25 micron CMOS
Digital Audio Interface provides glueless interface to
low-power DACs, ADCs, and CODECs.
Two Synchronous Serial Interfaces (SSI1, SSI2)
CODEC Sound Interface
88 Keypad Scanner
27 General-purpose Input/Output Pins
The EP7312 is designed for ultra-low-power operation. Its core The EP7312 integrates an interface to enable a direct
operates at only 2.5 V, while its I/O has an operation range of connection to many low cost, low power, high quality audio
2.5V3.3V. The device has three basic power states: converters. In particular, high quality ADCs, DACs, or
operating, idle and standby. CODECs such as the Cirrus Logic CS53L32A, CS43L42, and
CS42L50 are easily added to an EP73xx design via the DAI.
MaverickKey unique hardware programmed IDs are a solution
Some of these devices feature digital bass and treble boost,
to the growing concern over secure web content and
digital volume control and compressor-limiter functions.
commerce. With Internet security playing an important role in
the delivery of digital media such as books or music, Simply by adding desired memory and peripherals to the
traditional software methods are quickly becoming unreliable. highly integrated EP7312 completes a low-power system
The MaverickKey unique IDs provide OEMs with a method of solution. All necessary interface logic is integrated on-chip.
utilizing specific hardware IDs such as those assigned for
SDMI (Secure Digital Music Initiative) or any other
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