Wpa/WPAR01/Ad の履歴(No.2)

[ トップ ]   [ 新規 | 一覧 | 検索 | 最終更新 | ヘルプ ]

• 履歴一覧
• ソース を表示
• Wpa/WPAR01/Ad は削除されています。
  • 1 (2005-02-03 (木) 02:29:10)
  • 2 (2005-02-03 (木) 02:51:21)
  • 3 (2005-02-06 (日) 19:32:57)
  • 4 (2005-02-06 (日) 20:32:48)
  • 5 (2005-02-08 (火) 10:52:51)
  • 6 (2005-02-10 (木) 08:18:36)
  • 7 (2005-02-10 (木) 10:51:22)
  • 8 (2005-02-10 (木) 19:58:34)
  • 9 (2005-02-11 (金) 05:16:44)
  • 10 (2005-02-13 (日) 18:19:35)
  • 11 (2005-02-14 (月) 02:28:47)
  • 12 (2005-03-14 (月) 07:32:27)

---

#navi(contents-page-name): No such page: Wpa

Advertisement

---

• Status: alpha

Feb. 2, 2004
Wireless & Visual Communication Co., Ltd.

Overview†

WPAR is a reference board of wireless multimedia receiver, aiming to be an application development platform for wireless transmission of audio, image, and video contents.

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 conformed with IEEE 802.11b is connected to WPAR via PC card slot, allowing for keeping up with the latest wireless LAN standards such as IEEE 802.11a and IEEE 802.11g by upgrading the network card.

WPAR'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, AC3, and so forth. The decoded video is simultaneously outputted as VGA and NTSC 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 allow it to run interactive tasks during video playing.

Finally, all these features are implemented with selected components in terms of power consumption and thermal emission. As a result, WPAR does not require cooling fans, thus, is the best solution for embedded applications.

Features†

This device is formed by 4 functional blocks below:

1. MPU block: controls whole device
2. WLAN block: supports 802.11b external CardBus card
3. Video block: MPEG-1/2/4 data is converted to the output signal to the video terminal and VGA terminal
4. Image block: JPEG(software based design above the MMI and application software) data is Converted to the output signal to the RGB terminal These functional blocks should possess as follows. Functional constitution of the device is shown in Fig.2

1. MPU block (Based on Renesus SH7751R/240MHz with open Linux OS)
   • Operating condition's setup of WLAN block
   • Operating condition's setup of Video block
   • UDP TCP/IP protocol
   • Buffer control of Video data process
   • Application function is synchronized with transmission.
   • Driver function for the WLAN control
   • Driver function for the Video block control
   • Driver function for Image block control
   • JPEG Decompression function provide XGA image resolution
2. WLAN block
   • Compliant with 802.11b protocol
   • Specialized protocol for Audio and Video transmission procedure
3. Video/image block
   • MPEG-1/2/4 data's extension
   • Decoding process for a projector's output signal by going through video and RGB(BGA) terminal
   • JPEG Decompression function provide XGA image resolution for RGB(VGA) terminal
4. LED
   • Indication LED`s content is below (minimum)
     • Power source LED: shows the fact that power source is applied.
     • Status indication LED: shows a condition of the device
     • Link establishing
     • Data receiving
5. The operation button or SW
   • Consists of the below buttons (minimum)
     • Button: displays related information such as SSID, IP address, channel number, resolution. Being used as reset button as well (long 5 sec. or more pushing)
     • Button: power source
     • SW: auto scan
     • Button: resolution

System†

Fig.1 shows a connection constitution of the device.

#ref(): File not found: "wpa_system.gif" at page "Wpa/WPAR01/Ad"

As shown in the Fig.1, this device is used by direct connecting to the picture terminal of the projector. The picture is transmitted from PC through a wireless adapter, such as WLAN card. This device is possible to connect through the Infrastructure mode using Access Point (AP) as well as through the Ad hoc mode.

Specification†

Block Diagram†

     

Site admin: admin

PukiWiki 1.5.4 © 2001-2022 PukiWiki Development Team. Powered by PHP 8.1.27. HTML convert time: 0.005 sec.