The **MC9328MXL** (often referred to as the **i.MXL**) is a low-power, high-performance microprocessor based on the ARM920T core. It was developed by Freescale (now NXP) specifically for the mobile and embedded markets, such as PDAs, smart phones, and industrial handhelds. --- ## 1. Core Architecture The heart of the MC9328MXL is the **ARM920T** core, which balances power efficiency with enough computational power for graphical user interfaces and multimedia. | Feature | Specification | | :--- | :--- | | **CPU Core** | ARM920T (32-bit RISC) | | **Clock Speed** | Up to 200 MHz | | **Instruction Cache** | 16 KB | | **Data Cache** | 16 KB | | **MMU** | Yes (Supports Linux, WinCE, RTOS) | --- ## 2. Key Integrated Peripherals One of the strengths of the i.MXL is its high level of integration, reducing the need for external chips (BOM cost reduction). ### Connectivity & I/O * **USB Device:** Integrated USB 1.1 function controller. * **UARTs:** Three Universal Asynchronous Receiver/Transmitters for serial communication. * **I2C & SPI:** Standard interfaces for connecting sensors and EEPROMs. * **SSI/I2S:** Synchronous Serial Interface for connecting to Audio Codecs. ### Display & Graphics * **LCD Controller:** Supports STN, Color STN, and TFT displays. * **Resolution:** Up to 800x600 (though typically used for VGA/QVGA). ### Storage & Memory Support * **SDRAM Controller:** Supports 16-bit or 32-bit wide memory. * **Flash Support:** Interface for NAND/NOR flash. * **MMC/SD Slot:** Integrated controller for Secure Digital and MultiMediaCards. --- ## 3. Power Management Features The "L" in MXL stands for Low Power. The chip employs several techniques to extend battery life: 1. **Dynamic Process Temperature Compensation (DPTC):** Adjusts voltage and frequency based on workload and heat. 2. **Wait and Doze Modes:** Shuts down unused portions of the CPU clock. 3. **Low Voltage Operation:** The core typically operates at 1.7V - 1.9V. --- ## 4. Technical Pinout & Packaging The device is usually found in a BGA (Ball Grid Array) package, which is ideal for compact mobile PCB designs. ```text Package Type: 256-pin MAPBGA (14mm x 14mm) Pitch: 0.8mm Operating Temp: -40°C to +85°C (Industrial Grade) ``` --- ## 5. Comparison: MC9328MXL vs. Modern i.MX While the MXL was a pioneer, it is important to note where it sits compared to modern hardware: | Feature | MC9328MXL (i.MXL) | Modern i.MX (e.g., i.MX8) | | :--- | :--- | :--- | | **Core** | ARM9 (Single) | ARM Cortex-A53/A72 (Multi) | | **Video** | Software Decoding | Hardware H.265/4K Support | | **USB** | 1.1 (12 Mbps) | 3.0 (5 Gbps) | | **Process** | 0.13 micron | 14nm / 7nm |