Cirrus Logic EP7312

	v. 3.1
Architecture:	ARM
Processor group:	ARM720T
Markets:	wireless, Internet appliances, industrial
Many of our target-support guides for BlueCat Linux are available for download.
Please consult the board-support guide or contact us for specific platform features supported.

The Cirrus Logic® EP7312 is designed for ultra-low-power applications such as portable handheld devices that require digital audio decompression capability, Internet appliances, and low-power industrial controls.

The core-logic functionality of the device is built around an ARM720T processor running at clock speeds up to 90 MHz and 74 MHz with 8 KB of four-way, set-associative, unified cache and a write buffer. Incorporated into the ARM720T is an enhanced memory management unit (MMU), which allows for support of sophisticated operating systems like BlueCat® embedded Linux®.

The EP7312 is designed for ultra-low-power operation. Its core operates at only 2.5 V, while its input/output has an operational range of 2.5 V to 3.3 V. The device has three basic power states: operating, idle, and standby.

The EP7312 integrates a digital audio interface to enable a direct connection to many low-cost, high-quality, audio converters from Cirrus Logic.

Simply by adding the desired memory and peripherals to the highly integrated EP7312 completes a low-power system solution. All necessary interface logic is integrated on-chip.

• ARM7TDMI processor and MMU supporting Thumb mode:
  • 8 KB of four-way, set-associative cache
• Supports MP3, WMA, AAC, ADPCM, Audible, etc.
• 48 KB of on-chip SRAM
• 32-bit unique MaverickKey ID for digital rights management or design IP security
• Dynamic clock speeds of 90 MHz and 74 MHz
• LCD controller, interrupt controller, and boot ROM
• IrDA, PWM (2), and 16550 UART (2) interfaces
• Real-time clock and two general-purpose 16-bit timers
• Integrated peripheral interfaces:
  • 32-bit SDRAM interface up to 2 external banks
  • 8/32/16-bit SRAM/Flash/ROM
  • Glueless digital audio plus CODEC interface
  • Two synchronous serial interfaces (SSI1, SSI2)
  • 8x8 keypad scanner and dedicated LED flasher (via real-time clock)
  • 27 general-purpose I/O pins
• Ultra-low power
  • 90 mW at 74 MHz
  • 108 mW at 90 MHz (typical)
  • <0.03 mW in the standby state
• Package: 208-pin LQFP, 256-ball PBGA, 204-ball TFBGA: available in commercial and industrial temperatures

The Cirrus Logic EP7312 BSP includes support for the following board functionality:

General	Memory	Peripherals	Boot Support
On-chip timer On-chip real-time clock (RTC) On-chip interrupt controller On-chip cache Power management	NOR Flash (16MB on board JFFS) DRAM (16MB on board SDRAM) NAND Flash (16MB on board)	On-chip UART (2) On-chip modem control signals CS 8900 on-board Ethernet Audio (CS 434x on-board audio out and in FIQ supported) LCD on chip IDE Smart Media	NOR Flash (compressed kernel and root file system) Network (TFTP)

Visit Cirrus Logic for more information and documentation on the EP7312.