CN202818461U - Video character superimposition device capable of updating font - Google Patents
Video character superimposition device capable of updating font Download PDFInfo
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- CN202818461U CN202818461U CN 201220480342 CN201220480342U CN202818461U CN 202818461 U CN202818461 U CN 202818461U CN 201220480342 CN201220480342 CN 201220480342 CN 201220480342 U CN201220480342 U CN 201220480342U CN 202818461 U CN202818461 U CN 202818461U
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- video
- programmable logic
- logic device
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Abstract
The utility model relates to a video character superimposition device capable of updating a font, which comprises a single chip microcomputer, a character superimposition chip, a video amplification buffer circuit and a FLASH memory chip, wherein the single chip microcomputer is connected with the character superimposition chip; and the character superimposition chip is connected with the video amplification buffer circuit. The main technical characteristics are that the single chip microcomputer is connected with a programmable logic device, and the programmable logic device is respectively connected with the character superimposition chip and the FLASH memory chip. The video character superimposition device capable of updating the font is reasonable in design; and as a programmable logic device is arranged between the character superimposition chip and the FLASH memory chip and is then connected with the single chip microcomputer, the single chip microcomputer controls the programmable logic device to realize the display of character superimposition on the video and the function of FLASH data updating.
Description
Technical field
The utility model belongs to protection and monitor field, especially a kind of video character stacking apparatus of scalable character library.
Background technology
In protection and monitor field, use in large quantities such as headend equipments such as The Cloud Terraces, these headend equipments require to show The Cloud Terrace information or menu.Existing video character overlaying scheme, all adopt the MB90092 character overlap chip directly to be connected with the FLASH storage chip, finish writing before dispatching from the factory and the data in the FLASH storage chip also are manufacturers, and in use can't revise, be difficult to realize the upgrade function of character library.
Summary of the invention
The purpose of this utility model is to overcome the deficiencies in the prior art, provides a kind of reasonable in design and can conveniently revise the video character stacking apparatus of the scalable character library of FLASH data.
The utility model solves its technical problem and takes following technical scheme to realize:
A kind of video character stacking apparatus of scalable character library, comprise single-chip microcomputer, character overlap chip, video amplifier buffer circuit and FLASH storage chip, single-chip microcomputer is connected with character overlap chip, this character overlap chip is connected with the video amplifier buffer circuit, described single-chip microcomputer connects a programmable logic device, and this programmable logic device is connected with the FLASH storage chip with character overlap chip respectively.
And described programmable logic device is FPGA or CPLD.
And described character overlap chip is the MB90092 character overlap chip.
Advantage of the present utility model and good effect are:
The utility model is reasonable in design, between character overlap chip and FLASH storage chip a programmable logic device is set and is connected with single-chip microcomputer, the Single-chip Controlling programmable logic device is implemented on the video that overlaying character shows and to FLASH data upgrade function.
Description of drawings
Fig. 1 is circuit block diagram of the present utility model.
Embodiment
Below in conjunction with accompanying drawing the utility model is further described.
A kind of video character stacking apparatus of scalable character library, as shown in Figure 1, comprise single-chip microcomputer, character overlap chip MB90092, programmable logic device, video amplifier buffer circuit and FLASH storage chip, single-chip microcomputer is connected with programmable logic device with character overlap chip MB90092 respectively, this character overlap chip MB90092 is connected with the video amplifier buffer circuit, and programmable logic device is connected with character overlap chip MB90092 and FLASH storage chip respectively.When normally showing, single-chip microcomputer sends to programmable logic device orders the data and the control character chip superposed MB90092 that read among the FLASH to finish character Overlapping display function by the video amplifier buffer circuit; When needs were upgraded to the FLASH data, single-chip microcomputer sent upgrade command and upgrade data to programmable logic device, and programmable logic device writes upgrade data in the FLASH storage chip, finishes the upgrade function to the data among the FLASH.
In the present embodiment, single-chip microcomputer is selected STM32F103VCT6, programmable logic device can adopt the FPGA device, also can adopt the CPLD device, in the present embodiment, programmable logic device is selected the CPLD of Lattice, and the chip model is LCMX02-1200HC-41G100C, and the FLASH chip adopts A29160UV.ADR0 to the ADR20 pin of MB90092, DA0 to DA7 pin and READ pin link to each other with CPLD.The pin of CPLD links to each other with the pin of the address pins of FLASH, data pins and control read-write.Single-chip microcomputer also links to each other with MB90092 with three GPIO except other parts of control The Cloud Terrace, and simultaneously, single-chip microcomputer links to each other with CPLD with the SPI mouth, and the UART of single-chip microcomputer connects external control devices.
Operation principle of the present utility model is: carrying out when character shows, three GPIO that single-chip microcomputer links to each other by MB90092 show to the MB90092 control character that sends instructions.Need to be from the dot array data of outside FLASH reading character when MB90092 shows character, it can be by ADR0 to ADR20 pin, DA0 to DA7 pin, the pin reading out datas such as READ pin, these pins are connected to CPLD, and CPLD is transmitted to MB90092 after receiving instruction behind the FLASH reading out data.In the time need to upgrading to the character pattern data among the FLASH, external control devices sends upgrade command by UART to single-chip microcomputer, and single-chip microcomputer sends command request CPLD by SPI to CPLD and changes operating state.CPLD enters upgrade status after receiving instruction, does not respond the request of the reading out data of MB90092.The character pattern data send to single-chip microcomputer by peripheral control unit by UART, and single-chip microcomputer is transmitted to CPLD by SPI, the data pins of CPLD by being connected with FLASH, and address pins and control pin are wiped and programming operation FLASH.
It is emphasized that; embodiment described in the utility model is illustrative; rather than determinate; therefore the utility model comprises and is not limited to the embodiment described in the embodiment; every by those skilled in the art according to other execution modes that the technical solution of the utility model draws, belong to equally the scope of the utility model protection.
Claims (3)
1. the video character stacking apparatus of a scalable character library, comprise single-chip microcomputer, character overlap chip, video amplifier buffer circuit and FLASH storage chip, single-chip microcomputer is connected with character overlap chip, this character overlap chip is connected with the video amplifier buffer circuit, it is characterized in that: described single-chip microcomputer connects a programmable logic device, and this programmable logic device is connected with the FLASH storage chip with character overlap chip respectively.
2. the video character stacking apparatus of a kind of scalable character library according to claim 1, it is characterized in that: described programmable logic device is FPGA or CPLD.
3. the video character stacking apparatus of a kind of scalable character library according to claim 1, it is characterized in that: described character overlap chip is the MB90092 character overlap chip.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220480342 CN202818461U (en) | 2012-09-18 | 2012-09-18 | Video character superimposition device capable of updating font |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220480342 CN202818461U (en) | 2012-09-18 | 2012-09-18 | Video character superimposition device capable of updating font |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202818461U true CN202818461U (en) | 2013-03-20 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220480342 Expired - Fee Related CN202818461U (en) | 2012-09-18 | 2012-09-18 | Video character superimposition device capable of updating font |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202818461U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105072361A (en) * | 2015-08-20 | 2015-11-18 | 河北上元工控技术有限公司 | Video character superposition circuit and electronic device |
-
2012
- 2012-09-18 CN CN 201220480342 patent/CN202818461U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105072361A (en) * | 2015-08-20 | 2015-11-18 | 河北上元工控技术有限公司 | Video character superposition circuit and electronic device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130320 Termination date: 20150918 |
|
| EXPY | Termination of patent right or utility model |