CN2862537Y - Download and upload combined interface circuit in set-top box - Google Patents
Download and upload combined interface circuit in set-top box Download PDFInfo
- Publication number
- CN2862537Y CN2862537Y CNU2005201181104U CN200520118110U CN2862537Y CN 2862537 Y CN2862537 Y CN 2862537Y CN U2005201181104 U CNU2005201181104 U CN U2005201181104U CN 200520118110 U CN200520118110 U CN 200520118110U CN 2862537 Y CN2862537 Y CN 2862537Y
- Authority
- CN
- China
- Prior art keywords
- pin
- chip
- max202
- circuit
- interface
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Images
Landscapes
- Test And Diagnosis Of Digital Computers (AREA)
Abstract
The utility model discloses a symmetric dual-circuit Mini RS232 safety interface and electric level exchanging circuit, i.e. an interface circuit design to realize downloading and uploading through a single-chip MAX202, relating the built-in system developing technology. The utility model advantages in that saving hardware resources, sampling and unifying the interface circuit to ensure the system's safety realizing the electric level exchanges of the up/down signals.
Description
Technical field
The utility model is applicable in the exploitation based on the set-top box scenario of Fujitsu SmartMPEG chip and similar embedded system scheme, is the communication interface technology of development board and PC.
Background technology
Set-top box is to realize a conversion of signals control device of television digitization, is the multimedia digital treatment system of a complexity.In the development process of set-top box, need the debugging work of a large amount of software, hardware, one of them necessary tool is exactly the debugging interface between set-top box and the computer.
In set-top box scenario solution development process based on Fujitsu SmartMPEG chip, on the one hand need download in the development board by serial ports, need on the other hand to receive the development board feedack from serial ports.Present solution is to use 2 MAX202 serial port drive chips to drive the receipts of each signal respectively and sends out; The weak point of this scheme is: the one, do not make full use of the twin-channel characteristics of MAX202, and cause the wasting of resources; The 2nd, on set-top box, need 2 serial line interface sockets, cause the waste in development board space; The 3rd, these two interface appearances roughly the same, very easy wrong under development causes circuit to damage.
Summary of the invention
In view of the foregoing, the design utilizes Mini RS232 symmetry two-way safe interface characteristics (see figure 2), adopt 2 DB9 port P1, P2, a serial port drive chip U1 and a double contact pin JP1 (SIP10), to download and upload function two-in-one, realized 2 road Mini RS232 communications with a slice MAX202 chip, saved hardware resource, simplify and unified Interface design, guaranteed the safety of set-top-box system circuit.
The operation principle of circuit (Fig. 1) is: 2 road signals that development board is sent are delivered to pin 10, the pin 11 of MAX202, through level conversion, send the serial ports that arrives PC from pin 14, pin 7; 2 road signals that send from PC enter pin 13, the pin 8 of MAX202, through after the MAX202 level conversion from pin 12, pin 9 outputs of IC, again through bleeder circuit R2, R3 and R5, R6, realize the conversion of 5V to 3.3V, arrive development board at last.
This circuit has following advantage:
1, interface is simplified.Use single interface and single cable to draw 2 road signals, realize that by public IC and peripheral component signal drives;
2, interface is unified.Because interface adopts symmetric design,, avoided because the anti-inserted fault that burns out development board that causes of interface takes place even interface is still worked under the anti-inserted situation of physics.
Description of drawings
Fig. 1 is circuit theory diagrams of the present utility model;
Fig. 2 is symmetrical two-way Mini RS232 safe interface;
Fig. 3 for this reason circuit at the position view of system.
Embodiment
With reference to Fig. 3, Fig. 2 according to the following steps connecting circuit:
1, on development board according to Fig. 2 " symmetrical two-way Mini RS232 safe interface ", the position of design contact pin is communicated with signal, power supply and ground by flat cable with Fig. 1 " level shifting circuit ".
2,2 tunnel serial download/debug signal lines of master chip (Smart MPEG) are connected to pin 10, the pin 11 of MAX202,, send the serial ports that arrival is connected with PC from pin 14, pin 7 through level conversion; 2 road signals that send from the PC serial ports enter pin 13, the pin 8 of MAX202, export through pin 12, the pin 9 from IC after the MAX202 level conversion, realize the conversion of 5V through bleeder circuit R2, R3 and R5, R6 again, be connected to the serial ports of master chip (SmartMPEG) at last to 3.3V.
3, pass through serial port DB9 terminals P 1, the P2 of 2 standards, and be connected with PC by two standard 9 core serial interface cables, wherein one is the debugging line, and one is to download line.
The utility model not only is applicable to the exploitation of Smart MPEG, also is applicable to the exploitation of the embedded system with similar interface.The above only is preferred embodiment, and protection range of the present utility model is not limited thereto.Anyly all belong within the protection range of the present utility model based on the equivalent transformation on the present design.
Claims (2)
1, a kind of set-top box that is used for supports to download two-in-one interfaces circuit with upload function simultaneously, it is characterized in that: this interface arrangement is applied between PC and the embedded system (d), realize 2 road two-way simultaneous communications, MAX202 (U1) and peripheral circuit are public, serial D B9 port P1, P2 are independent the use, as downloading and upload interface, R1 and D1 form power indicating circuit respectively; The pin 1,3 of chip U1, pin 4,5, pin 6, pin 2, pin 16 meet capacitor C 2, C3, C5, C4, C1 respectively, and the serial port of development board master chip is connected to the pin 10,11 of MAX202, finishes level conversion, receives serial ports P1, P2 from pin 14,7 again; Be connected to the pin 13,8 of U1 from 2 road descending signals of PC, finish level conversion, again from pin 12,9 outputs of U1, the bleeder circuit via R2, R3 and R5, R6 resistance are formed becomes the master chip that 3.3V receives development board.
2, serial line interface according to claim 1 road, it is characterized in that: it comprises 2 DB9 port P1, P2, a serial port drive chip U1 and a double contact pin JP1 (SIP10), will download and upload function two-in-one, realized 2 road Mini RS232 communications with a slice MAX202 chip.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2005201181104U CN2862537Y (en) | 2005-08-31 | 2005-08-31 | Download and upload combined interface circuit in set-top box |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2005201181104U CN2862537Y (en) | 2005-08-31 | 2005-08-31 | Download and upload combined interface circuit in set-top box |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2862537Y true CN2862537Y (en) | 2007-01-24 |
Family
ID=37660167
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2005201181104U Expired - Lifetime CN2862537Y (en) | 2005-08-31 | 2005-08-31 | Download and upload combined interface circuit in set-top box |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2862537Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101790029A (en) * | 2010-03-03 | 2010-07-28 | 福建新大陆通信科技有限公司 | Method for performing read-write operation on set top box |
-
2005
- 2005-08-31 CN CNU2005201181104U patent/CN2862537Y/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101790029A (en) * | 2010-03-03 | 2010-07-28 | 福建新大陆通信科技有限公司 | Method for performing read-write operation on set top box |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103678212B (en) | Based on the general-purpose interface detection device of VPX framework | |
| CN104698923B (en) | EMUs supplementary controlled system | |
| CN108984354A (en) | A kind of server chips debug circuit, adjustment method and server | |
| CN102637453A (en) | Phase change memory including serial input/output interface | |
| CN200980110Y (en) | RS232 and RS485 mixed interface circuit | |
| CN2862537Y (en) | Download and upload combined interface circuit in set-top box | |
| CN205016791U (en) | USBType -C connector module | |
| CN201698418U (en) | Can bus conversion card | |
| CN203689514U (en) | Master-slave coordinated work Godson server PCI-E device | |
| CN207473602U (en) | A kind of USB interface-based CAN bus control device | |
| CN213122967U (en) | RS485 signal sharing device | |
| CN201623726U (en) | Communication device based on avionic bus ARINC429 protocol | |
| CN201113097Y (en) | Power supply line/net twine two-in-one device for notebook computer | |
| CN211087371U (en) | Sorting machine control system based on wireless WI-FI technology | |
| CN203480505U (en) | Networked programmer system | |
| CN205983121U (en) | Switching station is synthesized intelligent terminal and is observed and controled board | |
| CN201397505Y (en) | Serial port insulating circuit | |
| CN201663611U (en) | Modem | |
| CN202889378U (en) | Industrial-grade communication-information processing platform | |
| CN205563551U (en) | A auto -change over device able to programme for RS232 and RS485 | |
| CN104915313A (en) | FMC board card for realizing level transformation by using FPGA (field programmable gate array) | |
| CN205451747U (en) | LED display screen system based on power line carrier | |
| CN202797546U (en) | Standard interface of radio module | |
| CN216016890U (en) | Dual-core 4U data communication gateway | |
| CN202976319U (en) | Central processing unit (CPU) card and embedded secure access module (ESAM) communication multiplex circuit of three-phase fee control intelligent ammeter |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee |
Owner name: CEC HUADA ELECTRONIC DESIGN CO., LTD. Free format text: NEW ADDRESS: 5/F, TOWER A, WANGJING HIGH-TECH VENTURE PARK, NO.2, LIZE MIDDLE 2ND ROAD, CHAOYANG DISTRICT, BEIJING CITY, ZIP CODE:100102 |
|
| CP02 | Change in the address of a patent holder |
Address after: Beijing City, Chaoyang District Lize two Road No. 2, Wangjing science and Technology Park A block five layer, zip code: 100102 Patentee after: Beijing CEC Huada Electronic Design Co., Ltd. Address before: Beijing city Chaoyang District District No. 1 Gaojiayuan, zip code: 100015 Patentee before: Beijing CEC Huada Electronic Design Co., Ltd. |
|
| CX01 | Expiry of patent term |
Expiration termination date: 20150831 Granted publication date: 20070124 |
|
| EXPY | Termination of patent right or utility model | ||
| DD01 | Delivery of document by public notice |
Addressee: Gai Ana Document name: Notification that Application Deemed not to be Proposed |