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Shop Best Oak Front Doors and Frames in Digah House Company

Shop Best Oak Front Doors and Frames in Digah House Company

2021-11-12
Digah Company
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Design of Flash Paging Secondary Boot Program Based on DM642
Design of Flash Paging Secondary Boot Program Based on DM642
Design of flash paging secondary boot program based on DM6420 Introduction TMS320DM642 is a high-performance digital multimedia processor introduced by TI company. It has two-level memory, high-speed buffer and ultra long instruction word structure. Its advantages of fast operation speed, small volume and low power consumption make it widely used in the field of multimedia processing. The application system based on flash boot DM642 is developed. After the system is powered on, the automatic boot mechanism of the system automatically loads the application program in flash into the on-chip RAM to run. However, due to the automatic boot mechanism, only 1 KB code in off chip flah can be loaded into RAM. This requires the development of a boot program that can load all applications, that is, a secondary boot program.1. Boot mode of DM642 DM642 has three main boot modes: (1) Do not load. The CPU directly starts executing the instructions in the memory at address 0. If the memory here is SDRAM, the CPU will hang first until SDRAM initialization is completed. (2) ROM loading. The 1 KB program located in the ROM of the external CE1 space is first moved to address 0 through DMA / EDMA. Although the loading process starts only after the chip is released from the reset signal, when the chip is still in reset, it begins to prepare for the above transmission. After the transmission is completed, the CPU exits the reset state and starts executing the instruction at address 0. The program storage format in ROM shall be consistent with the endpoint mode of the chip. (3) Host load. The core CPU stays in the reset state, and the rest of the chip remains normal. The external host initializes the storage space of the CPU through the host interface, including the on-chip configuration register. After all initialization work is completed, write "1" to dspint of interface control register to end boot. After the CPU exits the reset state, the instruction is executed from address 0. In the application system based on DM642, the boot mode of ROM loading is mainly adopted, and the application program is stored in flash through external flash chip. The application program still exists after the system is powered off, so that the system can run offline. Moreover, with the help of secondary boot program, the development of large-scale application based on DM642 will be more convenient and flexible.2. Connection between DM642 and flash In this paper, the tms320dm642agdk of TI company is used for DM642, and the am29lv033c of AMD company is used for flash. The working clock of TMS320DM642 can reach 720 MHz and the processing performance can reach 5760 MIPs. It accesses the off chip memory through the external memory interface (EMIF). The EMIF interface is divided into four spaces, namely ce0 Ce3. Flash is mapped to CE1 space, and 8-bit ROM loading mode is adopted when power on. Am29lv033c is a 4 M & times; 8 B, 3 V single supply nonvolatile memory. CE1 subspace is configured as an 8-bit asynchronous static memory interface connected to flash. Since there are only 20 external address buses of DM642, the maximum addressing range of CE1 is 1m & times; 8 b。 CE1 only allocates the first half of the addressing space to flash and the second half to other resources, that is, the maximum addressable range is 512k × 8 b。 In order to address all the space of flash, the flash can be paged and managed. The flash is divided into 8 pages, and the page selection is controlled by the page address register located in CPLD through PA19, PA20 and PA21. The connection diagram between DM642 and flash is shown in Figure 1.Paging technology is used to address all flash spaces, and each page of flash is mapped to the same address space of CE1 (0x9000000 0x9007ffff). During the boot process of the secondary boot program, whenever the flash current page reaches the end of the page, change the output level of PA19, PA20 and PA21 through the page address control register to activate the next page and complete the boot process. In this paper, taking the video acquisition, coding and transmission program based on DM642 as an example, the design process of the secondary boot program of DM642 is described in detail.3 secondary boot program3.1 guidance process The secondary boot loader is placed at the starting address of flash. Once the DSP is powered on and reset, the secondary boot loader will be loaded to address 0 of ram through the automatic loading mechanism of DM642. At this time, the CPU will reset and start to execute the secondary boot loader. The boot process of the secondary boot program is as follows: first, configure the EMIF register, including global control register, CEX space control register, SDRAM control register, timing control register and extended control register. Then, obtain the program entry address, and then obtain the number of bytes and target address of each block according to the format of data block, and start copying the code. When the number of bytes obtained is 0, the boot ends and the CPU jumps to C_ Int00, establish the C language running environment, and execute from main (). The boot process is shown in Figure 2.3.2 secondary boot program design According to the boot process of the secondary boot program, the implementation code of the secondary boot program is written, and the secondary boot program is written in assembly language. The following is the specific implementation of each part. (1) Configure the EMIF register. Define the base address of EMIF register EMIF base = 0x01800000, and define the configuration value of each register as:(2) Copy the application code. Define the address of the boot table as copy_ Table = 0x90000400, the implementation code is as follows:(3) The code that determines whether to reach the end of the page. The address of the page address control register is 0x90080011. During code copying, always judge whether the loading pointer points to the beginning of the next page. If yes, return to 0x9000400. If not, continue copying. The implementation code is as follows:(4) Perform a jump. After the code copy is completed, the boot ends and the jump instruction is executed. The code is as follows:In addition, corresponding command files must be written to cooperate with the boot program to complete the boot process. In this example, put the secondary boot program in the. Boat load section and add the following code to the command file:4 experimental results Add the assembly file of the secondary boot program into the actual project, and apply for the corresponding memory space for the secondary boot program in the command file, compile and connect to generate an executable file (. Out). Then, the executable file is converted into CCS loadable data file through hex6x conversion tool. Establish the connection between CCS simulation environment and DM642 development board, and burn the data file into flash through CCS simulation platform. After burning, disconnect the development board from CCS, and the power on test program can run normally.5 Conclusion This paper introduces the design method of the secondary boot program of flash paging boot of DM642, and gives some implementation codes. Practice shows that this method is feasible. This provides a way for the practical application development based on DM642.
Has Obama Given You Any Money From Those Evil Rich People Yet?
Has Obama Given You Any Money From Those Evil Rich People Yet?
Has Obama given you any money from those evil rich people yet?I am sorry what was your question? I got kind of lost in that pontification— — — — — —Would you be upset with your bridesmaid?She makes $17 an hour, spends it on junk, and youre surprised she is not coming? I doubt she has any money left over for traveling. And honestly, who is saving money here? If you lost 1400 in deposits, and now you have to pay for airfare, hotel, and food for your wedding. Not to mention the guests costs, if they are able to attend. You lost your job and didnt know how to pay for everything. If I were you I would have scaled way back, instead of going bigger.— — — — — —According to a recent study from Yale, Medicare for all will save money and save lives, so why doesnu2019t everybody want it?Number one, many people believe-with good reason- that it wo not actually save any money. In fact, due to more usage and maybe even over usage, it's likely that it will be more expensive.Furthermore, generally, the top half of wage earners pay all of the federal income tax and likely that wouldnt change. And currently many people in the lower half of wageearners do pay for health insurance. So not only would the lower half not be paying into the pot to cover healthcare costs, we would be adding more people who would be consuming resources but would not be and never have been paying in. But the top half will be paying for all of it. I am sure that sounds good to the bottom end, but the the lower end of the top half absolutely can not afford to carry everyone else— — — — — —Which stocks are doing well right now?Since it's a game, you should not look for safe places to put your virtual money, you should look for the very aggressive plays. You should do that because if lose you did not lose any money but if go really aggressive you might win the game. You should buy any of the following just pick one: RIO, FCX, PCU, TIE, AIG, BAC, JPM they are all very risky and aggressive plays right now, since it's a game you should diversify either, but the hole lot in only one stock. you might double your 90.000 in no time, or lose bad, but in the end all that matter is finishing first. You cannot lose by adopting this strategy.— — — — — —Are fossils worth any money?As others have said, it depends on what kind of fossils they are, and how well-preserved. I know places in Texas where you can easily collect 100 pounds of fossils in an hour. Unfortunately, these are precisely the kind of fossils that are common as dirt, and that you probably will get little for, unless you decide to sell them yourself. However, a superbly-preserved invertebrate fossil can be worth at lot, especially if complete specimens a rare. For instance, trilobite fossils are common, but *whole* trilobite fossils are not, and these go for a tidy sum. If you are lucky enough to find a good vertebrate fossil, you could sell it for a *lot*. I would suggest looking around at fossil collections for sale online, and from there getting an idea of what the going rate for fossils of various kinds are.— — — — — —Did Kate Goslin save any money for the kids?I certainly hope so!! But her looks are so high maintenance! Lol I can not stand her! I am glad the show was canceled! But, to answer your question about the kids and money, I think there is a law now that protects children in show business or those on reality tv. Here is some info I found on the web... he Coogan law is a California law named for child actor Jackie Coogan. Jackie was a very famous and busy actor in the 1920s and 1930s (adults today might know him as Uncle Fester in the Addams Family series). When he became an adult, he found that despite making millions as a child, he was broke. His mother and step-father had used his earnings, which was legal at the time. As a result of his sad story, the original Coogan Law was passed in California in 1939. Today, there are various versions of the Coogan law in effect around the nation and in Canada. The laws mandate that a percentage of a child actor's gross income be set aside for them in trust. In the states, the common percentage is 15%. In Canada, it is 25% after the child has made $5,000. California's law is the most far-reaching and has been updated several times, most recently in 2004. It is the version used by most productions in the entertainment industry. For this reason, most of the information on this site is pertaining to CA, but parents should be aware that different laws may apply depending on where your child lives and works. New York, Louisiana, and New Mexico have fairly recent Coogan laws, and several more states are working on new legislation.
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