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DA14530 Datasheet(PDF) 75 Page - Renesas Technology Corp |
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DA14530 Datasheet(HTML) 75 Page - Renesas Technology Corp |
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75 / 333 page  DA14530 Low Power Bluetooth 5.1 SoC Final Datasheet Revision 3.4 21-Dec-2021 CFR0011-120-00 75 of 332 © 2021 Renesas Electronics DMAx_A_START_REG + AINCx BINCx + DMAx_B_START_REG DMAx_IDX_REG = = DMAx_INT_REG DMAx_LEN_REG DMAx_CTRL_REG 31 0 15 13 0 0 0 0 31 15 +1 AD[31-0] IRQ_ENABLE DMA_IRQ_CHx STOP/ RELOAD Bus request Bus Grant DMA_REQ DMA_ACK DMA_INT 15 0 Figure 23: DMA Channel Diagram Each DMA channel can generate an interrupt if the index counter DMAx_IDX_REG reaches the value of the channel's interrupt transfer length register, DMAx_INT_REG. After the transfer and before DMAx_IDX_REG is incremented, the interrupt is generated. For example, if DMA_x_INT_REG = 0 and DMA_x_LEN_REG = 0, there will be one transfer and an interrupt. 12.2.4 DMA Arbitration The priority level of a DMA channel can be set with bits DMA_PRIO[2-0]. These bits determine which DMA channel will be activated if more than one DMA channel requests DMA. If two or more channels have the same priority, an inherent priority applies (see register description). With DREQ_MODE = 0, a DMA can be interrupted by a channel with a higher priority if the DMA_IDLE bit is set. When DMA_INIT is set, however, the DMA channel currently performing the transfer locks the bus and cannot be interrupted by any other channels until the transfer is completed, regardless of whether DMA_IDLE is set. The purpose of DMA_INIT is to initialize a specific memory block with a certain value without any interruption from other active DMA channels that may request the bus at the same time. Consequently, DMA_INIT should be used only for memory initialization. When the DMA transfers data to/from peripherals, DMA_INIT should be set to 0. |
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