mbt shoes sale The DMA application _157 SHARC 2106

The DMA application SHARC 21062

odelIRPTEN: / / global interrupt enable wait: ... ... Other procedures jumpwait; (4) DMA interrupt service routine: int_lp0: .... . Interrupt handler to re-initialize the chain, ... ... Ibid junctions and DMARTI:. ENDSEG; them. II4 is to receive data start address, IM4 is the size of each transmitted bit transition, C4 is a counter. Each value is automatically transmitted by a data C4 1, reduced to 0, enter the DMA interrupt Qing-Chao: SHARC21062 the DhM application services. dm32-1dO,[link widoczny dla zalogowanych], lp0 a lp0, seg_pmco LDF file defined in the following: seg_pmco {TYPE (PMRAM) START (0x0002011O) END (0x0OO23FFF) WIDTH (4 Cool

} dm32-1dO {TYPE (DMRAM) START (0x000281o0) END ( Oxo0O285O0) WIDTH (32)) lp0 a Ip0 {TYPE (PMRAM) START (0x00020038) END (Oxo0O2o03b) WIDTH (4 Cool

j other. Between the host memory DMA transfer is also commonly used, the internal memory with 16-bit or 32 bit host (general purpose computer) for DMA communications, the host can access the DSP on-chip memory, such as the mainframe can I host the ISA slots / O port on the SHARC21062 the I / 0 register access. However, when applied to the transmission of data particular attention to packaging, through to the DMAC register bits 6,7 set. If the host bus is 16 bits, and ADSP21062 the I / O registers and data memory is 32 bits, the host is necessary to use high and low 16 bits are transmitted, while the DMAC is set to 16/32 bit mode, that is, dm (DMACx ) = 0x41. 3 common problems and solutions DMA transfer is not involved in the case of CPU alone completed,[link widoczny dla zalogowanych], the number of storage address and the size of each batch should be set in advance. Store the received data should be done properly, if the recipient received only the data stored in a memory address, and data processing time to treatment, it may be overwritten the next batch of data,[link widoczny dla zalogowanych], so store the data should be a ping-pong processing, which means that the two addresses. Table Tennis storage. Also encountered in the course of high interference occurs in ll the data loss of data and so on. Data obtained in the receiver of a constant high there, confirmed after the discovery of this phenomenon is the chain did not lead to the junction ground, then after a good problem-solving. Debugging process also found the phenomenon of losing a few,[link widoczny dla zalogowanych], for example, the first number of the first data lost, lost the second batch of the second data number, followed by the number of cycles lost or scattered, and finally recognized as a board when sending and receiving data between the receiver wait time too long, send and receive data transfer after the normal time matching. 4 Conclusion DMA is a completely independent system, only through the I / O bus and the DSP internal registers connected to a large extent, the burden of the liberation of DSP, the data can become more fluid out of the chip can also make the core processing unit to maximize the computing power for CPU intensive applications to design useful, is a very effective method of data processing. References: l�� Wu Minyuan. Jin Wei is,[link widoczny dla zalogowanych], Hu Zhixiong, et al. Principles of digital signal processor ADSP series fM1. Beijing: Electronic-T Industry Press, 2002. ��2�� LIU Shu-ming, Luo Junhui. ADSPSHARC Series DSP Application Design ��M��. Beijing: Electronic Industry Press ceremony, 2003. f31 Su Tao, Cai Jianlong, He Xuehui. DSP interface circuit design and programming ��M��. Xi'an: Xidian University Press, 2003. Subscription magazine subscriptions in 2007 has already begun, as well as the unit does not receive the order and readers, please obtain a copy of the title page of the contact order or set by the National Union of non Mailroom Subscription Services (Tianjin). In addition, the journal has been added to the following database systems: China Journal Net (Tsinghua Tongfang); China, the selection of core journals database; Chinese science and technology journals database. Contributors to the journal and the hiring of the manuscript, will be unified by the editorial department into the database system, access to the Internet to provide information services. Journal articles are included royalties paid by Internet service pay, no extra. Of any objection to this, please contributions when specifically stated otherwise facilitate editorial processing. Full text publication produced by the Internet system ~ format, readers can log on the website Read the full story. 41

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