產品描述

N32926U1DN是為了加速影音流媒體播放效能而特別設計的，其內嵌的硬件H.264 和MJPEG編解碼器以及AAC加速器和聲音處理單元(SPU)特別適合以音視頻流媒體為主的雲端多媒體應用方案。而內置的視頻解碼器和音頻編解碼器也將在提升整體性能的同時減輕CPU的運算負擔並降低功耗。 N32926U1DN使用ARM926EJ-S內核，其內部集成的H.264 編解碼器、以太網接口、JPEG解編碼器、CMOS攝像頭接口、32 通道的聲音處理單元(SPU)、ADC、DAC和TV編碼器不僅可以滿足各種應用需求，還能減少生產方面物料成本。而 240MHz主頻的ARM926內核與DDR2內存、H.264編解碼器、AAC加速器、SDIO Host控制器和USB 2.0 Host/Device高速接口的結合，使得N32926U1DN成為流媒體方案 選擇。 N32926U1DN使用Linux操作系統以方便驅動程序更新或添加新的功能，例如WiFi、瀏覽器等。另一方面，開源代碼也使得產品開發更加靈活。新唐持續對Linux系統的優化，為提供客戶高性價比的音視頻流媒體方案。不僅如此，其合作廠商的USB、SDIO WiFi模組也被集成用於如智能手機、平板、筆記本電腦或智能電視中的WiFi流媒體應用中。 N32926U1DN支持 分辨率D1(720x480)的電視信號輸出或 1024x768 的TFT LCD輸出。隨着流媒體應用的分辨率需求越來越高，H.264 視頻壓縮標準的高壓縮比成為在帶寬有限情況下 選擇。N32926U1DN的芯片設計為大量使用WiFi、以太網以及非標準RF等方案的流媒體應用提供高性價比的市場定位。例如在2.4GHz應用方面，提供了硬件CRC生成器和校驗引擎，可以降低CPU的負載和功耗，此外，內部集成的硬件信道編碼引擎如scrambler、Inter-lever、Reed-Solomon和Convolutional等編解碼器，可以讓讓流媒體數據在2.4GHz頻帶上的傳輸更為穩定順暢。 為了降低系統設計的複雜度和降低製造成本，N32926U1DN採用了128-pin LQFP的多芯封裝，其內部堆疊了 32Mbx16 DDR2內存的多芯封裝在確保高效能的同時也減少了系統設計難度，比如EMI或噪音抑制。全部的物料成本通過PCB雙面板、較小的PCB空間、阻尼電阻及EMI防護元件等的減少而降低。 1 Feature - CPU *ARM926EJ-S 32-bit RISC CPU with 8KB I-Cache & 8KB D-Cache *Frequency up to 240MHz@1.2V for typical operation condition *JTAG interface supported for development and debugging -Internal ROM and Booting *16KB IBR internal booting ROM supported *IBR booting messages displayed by UART console for debugging supported *Different system booting modes supported: *Memory card SD card SD-to-NAND flash bridge *NAND Interface Raw NAND Flash OTP ROM (N23512T / N231GT, MXIC ExtraROM) *SPI Flash *USB Mass Storage -DRAM MCP *16Mx16 DDR2 MCP for N32925UxDN *32Mx16 DDR2 MCP for N32926UxDN -EDMA (Enhanced DMA) *Totally 11 DMA channels supported 8 peripheral DMA channels for transfer between memory and on-chip peripherals, such as ADC, UART and SPI *3 dedicated channel for memory-to-memory transfer * Byte, half-word and word data width types supported *Single and burst transfer modes supported *Block transfer supported in memory-to-memory transfer channel *Color format transformation supported in memory-to-memory transfer channel Source color format could be RGB555, RGB565 and YCbCr422 Destination color format could be RGB555, RGB565 and YCbCr422 *Auto reload supported for continuous data transfer * Interrupt generation supported in the half-of-transfer or end-of-transfer -Capture (CMOS Sensor I/F) *CCIR601 & CCIR656 interfaces supported for connection to CMOS image sensor *Resolution up to 3M pixel (Will use external USB Camera Module with ISP and MIPI ICs) * YUV422 and RGB565 color format supported for data-in from CMOS sensor * YUV422, RGB565, RGB555 and Y-only color format supported for data storing to system memory *Planar and packet data formats supported for data storing to system memory * Image cropping supported with the cropping window up to 4096x2048 *Image scaling-down supported Vertical and horizontal scaling-down for preview mode supported The scaling factor is N/M Two pairs of configurable 16-bit N and 16-bit M for vertical and horizontal scaling-down The value of N has to equal to or less than M * Frame rate control supported * Combines two interlace fields to a single frame supported for data in from TV-decoder *Supports 1280x1024@15fps CIS (PCLK up to 48MHz)

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