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WPAR01 Wireless Multimedia Platform
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The WPAR01 is a reference board of wireless multimedia receiver, aiming to be an application development platform for wireless transmission of audio, image, and video contents.
Figure 1 shows the snapshot of the WPAR01. It is equipped with Renesas SH7751R that works at 240MHz, which allows developers to take full advantage of fast and stable SH-Linux technologies.
A wireless network interface that conforms to IEEE 802.11b is connected to the WPAR01 via PC card slot, allowing for keeping up with the latest KSC WLAN series that conform to IEEE 802.11a/b/g by upgrading the network card.
The WPAR01's outstanding graphics capability is realized with two controller chips: Silicon Motion's SM501 for 2D image rendering and Vweb's VW2010 for audio and video decoding. SM501 has several video layers including two graphics layers, two alpha layers, and a video layer, which are utilized for smooth display of image sequences with double buffering, and for building window GUIs. VW2010 supports a number of audio and video formats such as MPEG-1/2/4, their audio layers, and so forth. The decoded video is simultaneously outputted as VGA and TV formats. In addition, VW2010 also has multiple video layers, which enables overlaying of captions and images on moving pictures. This powerful combination of graphics chips releases the CPU from video processing loads and allows it to run interactive tasks during video playing.
Finally, all these features are realized with selected components in terms of power consumption and thermal emission. As a result, the WPAR01 does not require cooling fans, thus, is the best solution for embedded applications.
Figure 2 shows the block diagram of the WPAR01. The SH7751R (Renesas) is a 32 bit RISC microprocessor. It consists of the SH-4 CPU working at 240MHz, MMU, PCI bus controller, and BSC. Those built-in functions lead to lower system costs. A flash ROM for file system, SDRAM for main memory, graphic controller, and GPIO are connected to the local bus, while a video codec LSI and CardBus bridge are connected to the PCI bus. Finally, it is equipped with a USB-UART bridge for a serial console.
The SM501 (Silicon Motion Inc.) is a graphic controller chip with direct CPU bus interfaces. 16MB video RAM enables high resolutions up to 1280x1024, including a 1280x768 wide screen. It supports hardware video overlay, video scaling, and color space conversion from YUV to RGB.
The VW2010 (Vweb Corp.) is an audio and video codec chip that supports real time decoding of MPEG-1/2/4 and H.263 video stream as well as MPEG-1/2 audio layers and AC3 audio stream. With 8MB external SDRAM, it supports adaptive field/frame motion compensation and DCT types for high quality video decoding. It outputs ITU-R BT656 video signals through video DAC, CS4954 (Cirrus Logic), leading to S and composite video connecter as well as audio signals through audio DAC, CS4334 (Cirrus Logic), to RCA plug. The video signal is also transmitted into the graphic controller through ZV port, and it is displayed on the SM501 video layer. The VW2010 has multiple video planes: two graphic planes that support alpha blending and a hardware cursor plane.
The KS5930 (Key Stream) is a WLAN interface, which conforms to IEEE802.11a. It is connected to the WPAR01 via CardBus bridge. In addition to the KS5930, the KS2932 (Key Stream) WLAN interface, which conforms to IEEE802.11b, 100BaseTX wired LAN card and other CardBus devices are feasible depending on applications.
| CPU | Renesas SH7751R 240MHz |
|---|---|
| Main memory | 64MB SDRAM |
| Video RAM | 16MB (SM501), 8M (VW2010) |
| Flash ROM | 16MB |
| Graphic controller | Silicon Motion Inc. SM501 |
| Resolutions | 640x480 - 1280x1024, 16bit RGB/ARGB/YUV |
| Video codec | Vweb Corp. VW2010 |
| Wireless LAN | Key Stream IEEE802.11a/b |
| USB | USB 1.1 x1 |
| Video | Cirrus Logic CS4954 S/Composite |
| Audio | Cirrus Logic CS4334 Stereo RCA |
| VGA | 15-pin Dsub |
| Indicators | LED x3 |
| Switches | button x3, dip switch x3 |
| JTAG | 14-pin JTAG(H-UID) |
