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ADSP-BF534 Datasheet(PDF) 8 Page - Analog Devices |
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ADSP-BF534 Datasheet(HTML) 8 Page - Analog Devices |
8 / 68 page Rev. B | Page 8 of 68 | July 2006 ADSP-BF534/ADSP-BF536/ADSP-BF537 Event Control The Blackfin processor provides a very flexible mechanism to control the processing of events. In the CEC, three registers are used to coordinate and control events. Each register is 16 bits wide: • CEC interrupt latch register (ILAT) – Indicates when events have been latched. The appropriate bit is set when the processor has latched the event and cleared when the event has been accepted into the system. This register is updated automatically by the controller, but it may be writ- ten only when its corresponding IMASK bit is cleared. • CEC interrupt mask register (IMASK) – Controls the masking and unmasking of individual events. When a bit is set in the IMASK register, that event is unmasked and is processed by the CEC when asserted. A cleared bit in the IMASK register masks the event, preventing the processor from servicing the event even though the event may be latched in the ILAT register. This register may be read or written while in supervisor mode. (Note that general-pur- pose interrupts can be globally enabled and disabled with the STI and CLI instructions, respectively.) • CEC interrupt pending register (IPEND) – The IPEND register keeps track of all nested events. A set bit in the IPEND register indicates the event is currently active or nested at some level. This register is updated automatically by the controller but may be read while in supervisor mode. The SIC allows further control of event processing by providing three 32-bit interrupt control and status registers. Each register contains a bit corresponding to each of the peripheral interrupt events shown in Table 3 on Page 7. • SIC interrupt mask register (SIC_IMASK) – Controls the masking and unmasking of each peripheral interrupt event. When a bit is set in the register, that peripheral event is unmasked and is processed by the system when asserted. A cleared bit in the register masks the peripheral event, pre- venting the processor from servicing the event. • SIC interrupt status register (SIC_ISR) – As multiple peripherals can be mapped to a single event, this register allows the software to determine which peripheral event source triggered the interrupt. A set bit indicates the peripheral is asserting the interrupt, and a cleared bit indi- cates the peripheral is not asserting the event. • SIC interrupt wakeup enable register (SIC_IWR) – By enabling the corresponding bit in this register, a peripheral can be configured to wake up the processor, should the core be idled when the event is generated. (For more infor- mation, see Dynamic Power Management on Page 13.) Because multiple interrupt sources can map to a single general- purpose interrupt, multiple pulse assertions can occur simulta- neously, before or during interrupt processing for an interrupt event already detected on this interrupt input. The IPEND reg- ister contents are monitored by the SIC as the interrupt acknowledgement. The appropriate ILAT register bit is set when an interrupt rising edge is detected (detection requires two core clock cycles). The bit is cleared when the respective IPEND register bit is set. The IPEND bit indicates that the event has entered into the proces- sor pipeline. At this point the CEC recognizes and queues the next rising edge event on the corresponding event input. The minimum latency from the rising edge transition of the general- purpose interrupt to the IPEND output asserted is three core clock cycles; however, the latency can be much higher, depend- ing on the activity within and the state of the processor. DMA CONTROLLERS The Blackfin processors have multiple, independent DMA con- trollers that support automated data transfers with minimal overhead for the processor core. DMA transfers can occur between the processor’s internal memories and any of its DMA- capable peripherals. Additionally, DMA transfers can be accom- plished between any of the DMA-capable peripherals and external devices connected to the external memory interfaces, including the SDRAM controller and the asynchronous mem- ory controller. DMA-capable peripherals include the Ethernet MAC (ADSP-BF536 and ADSP-BF537 only), SPORTs, SPI port, UARTs, and PPI. Each individual DMA-capable peripheral has at least one dedicated DMA channel. The DMA controller supports both one-dimensional (1-D) and two-dimensional (2-D) DMA transfers. DMA transfer initial- ization can be implemented from registers or from sets of parameters called descriptor blocks. The 2-D DMA capability supports arbitrary row and column sizes up to 64K elements by 64K elements, and arbitrary row and column step sizes up to ±32K elements. Furthermore, the column step size can be less than the row step size, allowing implementation of interleaved data streams. This feature is especially useful in video applications where data can be de- interleaved on the fly. Examples of DMA types supported by the DMA controller include: • A single, linear buffer that stops upon completion • A circular, auto-refreshing buffer that interrupts on each full or fractionally full buffer • 1-D or 2-D DMA using a linked list of descriptors • 2-D DMA using an array of descriptors, specifying only the base DMA address within a common page. DMA Channels 12 and 13 (Memory DMA Stream 0) IVG13 29 DMA Channels 14 and 15 (Memory DMA Stream 1) IVG13 30 Software Watchdog Timer IVG13 31 Port F Interrupt B IVG13 31 Table 3. System Interrupt Controller (SIC) (Continued) Peripheral Interrupt Event Default Mapping Peripheral Interrupt ID |
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