世纪芯9月提供CY8C3444PVI单片机解密服务

在芯片解密过程中，对芯片内部结构及其加解密特征进行技术分析是解密工程师的一项必修课，因为只有充分理解芯片内部结构原理等技术信息，工程师才能准确进行方案开发，确定最可靠、成功率最高的解密方案，最大限度确保解密项目的安全可靠。　

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    CY8C3444PVI芯片DMA Features
　　24 DMA channels
　　Each channel has one or more Transaction Descriptors (TDs)
　　to configure channel behavior. Up to 128 total TDs can be
　　defined
　　TDs can be dynamically updated
　　Eight levels of priority per channel
　　Any digitally routable signal, the CPU, or another DMA channel,
　　can trigger a transaction
　　Each channel can generate up to two interrupts per transfer
　　Transactions can be stalled or canceled
　　Supports transaction size of infinite or 1 to 64k bytes
　　TDs may be nested and/or chained for complex transactions
　　4.4.3 Priority Levels
　　The CPU always has higher priority than the DMA controller
　　when their accesses require the same bus resources. Due to the
　　system architecture, the CPU can never starve the DMA. DMA
　　channels of higher priority (lower priority number) may interrupt
　　current DMA transfers. In the case of an interrupt, the current
　　transfer is allowed to complete its current transaction. To ensure
　　latency limits when multiple DMA accesses are requested simultaneously,
　　a fairness algorithm guarantees an interleaved
　　minimum percentage of bus bandwidth for priority levels 2
　　through 7. Priority levels 0 and 1 do not take part in the fairness
　　algorithm and may use 100% of the bus bandwidth. If a tie occurs
　　on two DMA requests of the same priority level, a simple round
　　robin method is used to evenly share the allocated bandwidth.
　　The round robin allocation can be disabled for each DMA
　　channel, allowing it to always be at the head of the line. Priority
　　levels 2 to 7 are guaranteed the minimum bus bandwidth shown
　　in Table 4-7 after the CPU and DMA priority levels 0 and 1 have
　　satisfied their requirements.

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