CN104658588A - PMP system - Google Patents
PMP system Download PDFInfo
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- CN104658588A CN104658588A CN201310588066.2A CN201310588066A CN104658588A CN 104658588 A CN104658588 A CN 104658588A CN 201310588066 A CN201310588066 A CN 201310588066A CN 104658588 A CN104658588 A CN 104658588A
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- chip
- pmp
- imx21
- flash
- usb interface
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Abstract
A PMP system belongs to the technical filed of PMP systems. The invention especially relates to a PMP system being low in cost and power consumption. The PMP system includes an IMX21 chip, a video interface, a USB interface, FLASH, a keyboard, an LCD screen, a power supply and an SD card. The PMP system is characterized in that in the structure, the IMX21 chip is respectively connected to the video interface, the USB interface, the FLASH, the keyboard, the LCD screen, the power supply and the SD card. The video interface is connected to a high-power loudspeaker. The USB interface is connected to a satellite receiver. The IMX21c chip is connected to an alarm driving circuit.
Description
Technical field
the invention belongs to PMP systems technology field, particularly relate to a kind of PMP system.
Background technology
along with masses are to the lifting of entertainment requirements, omnibearing audiovisual enjoys the expectation becoming people.Portable electronic device (Portable Media Player, PMP) be a kind of be the amusing products of its Core Feature with play multimedia file, under industrial environment and the market opportunity drive, " portable media player; the namely usual said MP4 of people has become a new focus of consumer product after the MP3 that continues to become study hotspot.The major advantage of PMP is: easy to carry, can play-over high-quality audio/video file; Also can browsing pictures, and use as portable hard drive, digital bank; In addition, the function such as FM, game is also had.PMP player not only needs to limit to some extent body size, the more important thing is and needs the video compression technology that a kind of compression efficiency is higher, image quality is higher, and relevant codec chip [1].Because consider the factors such as product development process and market, the author selects the MX21 of Freescale company to be master chip.Describe the soft and hardware design of this PMP system herein, emphasis is at Software for Design, and this PMP system schema is just in the development phase.
Summary of the invention
the present invention is exactly for the problems referred to above, provides the PMP system that a kind of cost is low, power consumption is little.
to achieve these goals, the present invention adopts following technical scheme, the present invention includes IMX21 chip, audio interface, Usb interface, flash, keyboard, LCD screen, power supply, SD card, its structural feature IMX21 chip is connected with audio interface, Usb interface, flash, keyboard, LCD screen, power supply, SD card respectively, audio interface is connected with high power acoustics, case, Usb interface is connected with satellite receiver, and IMX21 chip is connected with alarm drive circuit.
as a kind of preferred version, the present invention also comprises Sd ram, Sd ram and IMX21 chip.
as another kind of preferred version, flash of the present invention adopts Nand flash.
beneficial effect of the present invention.
the PMP that the present invention is based on Mx21 has lower cost and less power consumption, integrated hardware demoder, thus simplifies System Programming; Higher CPU dominant frequency, coordinate DDR internal memory, system is made to obtain data processing power at a high speed, simultaneously, software simulating adopts the linux kernel through cutting, whole code is realization of debugging under linux all. and due to the open source code of linux, so many codes are all with reference and transplanting, this just decreases cost of development undoubtedly.This PMP can support to comprise MPEG-1, MPEG-2, MPEG-4, WMV9, H.263, the multiple audio frequency and video form of DivX, XVID, MP3, WMA and WAV etc.
Accompanying drawing explanation
in order to make technical matters solved by the invention, technical scheme and beneficial effect clearly understand, below in conjunction with the drawings and the specific embodiments, the present invention is further elaborated.Should be appreciated that embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
fig. 1 is player module block diagram of the present invention.
Embodiment
the present invention includes IMX21 chip, audio interface, Usb interface, flash, keyboard, LCD screen, power supply, SD card, its structural feature IMX21 chip is connected with audio interface, Usb interface, flash, keyboard, LCD screen, power supply, SD card respectively, audio interface is connected with high power acoustics, case, Usb interface is connected with satellite receiver, and IMX21 chip is connected with alarm drive circuit.
as a kind of preferred version, the present invention also comprises Sd ram, Sd ram and IMX21 chip.
as another kind of preferred version, flash of the present invention adopts Nand flash.
iMX21 of the present invention is the multimedia processor dominant frequency 266MHz ~ 532MHz of Freescale based on the super low-power consumption of ARM926EJ-S, 16KB I-Cache, 16KB D-Cache, there is Java function, built-in MPEG-4 and H.263 Encode/Decode hardware function, directly can utilize hardware handles video image figure (Video and Graphics), save the software module to video image Processing Algorithm, processing speed in greatly improving, and CPU is built-in comprises visual accelerating module.The program is made up of parts such as primary processor, internal memory, booting ROM, SD card, LCD screen, peripheral expansion interface and keyboards.PMP adopts the using forestland of user-driven, has the user interface of high quality audio/video and response fast.During Mx21 data streams, first by USB interface, content of multimedia is downloaded to the IDE driver of PMP, DDMA controller reads content of multimedia from IDE driver, and compressed video data is written in DDR storer, Mx21 kernel reads the video of compression from DDR storer, and macro block data is write back to DDR storer, then the decoding of video is carried out, form RGB and show data, be written to DDR storer, last LCD controller fetches data to show from impact damper.This design proposal is a low-power consumption, high performance system scheme, be intended to make consumer enjoy high-quality video entertainment incessantly in road, primary processor Mx21 has carried out special optimization for application, thus make the design can provide the function of multiple a new generation, namely can support the media formats of multiple standards.
above content is the further description done the present invention in conjunction with concrete preferred implementation; can not assert that specific embodiment of the invention is confined to these explanations; for general technical staff of the technical field of the invention; without departing from the inventive concept of the premise; some simple deduction or replace can also be made, all should be considered as belonging to the protection domain that claims that the present invention submits to are determined.
Claims (3)
1.
a kind of PMP system, comprise IMX21 chip, audio interface, Usb interface, flash, keyboard, LCD screen, power supply, SD card, it is characterized in that IMX21 chip is connected with audio interface, Usb interface, flash, keyboard, LCD screen, power supply, SD card respectively, audio interface is connected with high power acoustics, case, Usb interface is connected with satellite receiver, and IMX21 chip is connected with alarm drive circuit.
2.
according to claim 1, a PMP system, characterized by further comprising Sd ram, Sd ram and IMX21 chip.
3.
according to claim 1, a PMP system, is characterized in that described flash adopts Nand flash.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310588066.2A CN104658588A (en) | 2013-11-21 | 2013-11-21 | PMP system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310588066.2A CN104658588A (en) | 2013-11-21 | 2013-11-21 | PMP system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104658588A true CN104658588A (en) | 2015-05-27 |
Family
ID=53249617
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310588066.2A Pending CN104658588A (en) | 2013-11-21 | 2013-11-21 | PMP system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104658588A (en) |
-
2013
- 2013-11-21 CN CN201310588066.2A patent/CN104658588A/en active Pending
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| WD01 | Invention patent application deemed withdrawn after publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20150527 |