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SAB82525N Datasheet(PDF) 78 Page - Siemens Semiconductor Group

Part No. SAB82525N
Description  High-Level Serial Communication
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Manufacturer  SIEMENS [Siemens Semiconductor Group]
Direct Link  http://www.siemens.com/
Logo SIEMENS - Siemens Semiconductor Group

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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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