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DIMM.AM335x (Rev3) 6/24

3 Functional Description

3.1 Processor AM335x

The DIMM-AM335x module is either based on the CPU AM3352 or AM3354from Texas Instruments.

It utilizes an ARM® Cortex-A8 core running at up to 720 MHz. Compared to the AM3352 the CPU

AM3354 includes an additional SGX530 3D graphics accelerator function block.

In addition to the CPU core with MMU, FPU and Cache, the processor provides the following

memory interfaces and peripheral function blocks:

 LCD interface up to 1280 x 768 pixels with up to 24 bpp colour depth

 DDR2/3 SDRAM controller

 Memory card interfaces, 2 x SDC/SDIO

 2 x USB 2.0 OTG

 Serial interfaces including 4 x UART, I²C, SPI, IIS

 DMA controller

 Interrupt controller

 15 channel interval timer

 Various GPIOs

 Power management

 Internal memories: 128 kB SRAM and 64 kB ROM containing bootloader

 JTAG debug interface

Watch:

 The processor bus interface is not available since the pins are multiplexed with pins of the

LCD and MMC interfaces

Further details of the processor can be found in the AM335x documents from Texas Instruments

[1].

3.1.1 Processor Clocks

All clocks needed for the different peripheral functions of the processor are derived from a 24 MHz

crystal which used as master clock input. The processor is normally operated in Turbo mode. This

means:

 CPU clock 720 MHz

 DDR3 clock 303 MHz

 L3 clock 200 MHz

 L4 clock 100 MHz (

* L3 clock)

Additionally a 32.768 kHz clock is supplied for the integrated RTC and power down operating

modes of the CPU.

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