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SAB82525H Datasheet(PDF) 78 Page - Infineon Technologies AG |
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SAB82525H Datasheet(HTML) 78 Page - Infineon Technologies AG |
78 / 126 page ![]() Semiconductor Group 78 SAB 82525 SAB 82526 SAF 82525 SAF 82526 After the DMA controller has been set up for the reception of the next frame, the CPU must be issue a RMC command to acknowledge the completion of the receive frame processing. The HSCX will not initiate further DMA cycles by activating the DRQR line prior to the reception of RMC. Note: It’s also possible to set up the DMA controller immediately after the start of a frame has been detected using the HSCX’s RFS (Receive Frame Start) interrupt option (see chapter 4.3). The following figure gives an example of a DMA controlled reception sequence, supposed that a long frame (66 bytes) followed by two short frames (6 bytes each) are received. Figure 38 DMA Driven Reception Sequence Example Serial Interface HSCX CPU/DMA Interface ITD00252 RME 32 32 2 6 RF2 RMC Receive Frame (66 DMA Read Cycles (68) DRQR(8) . . . . . . DRQR(8) RD . . . DRQR(4) DRQR(32) . . . RD RD RD RD . . . DRQR(32) RF3 6 1 Bytes) RD RD RME RMC RD RD RD RME RMC |
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