https://community.nxp.com/t5/S32K/In-S32K144-Used-Spi-AsyncTransmit-have-some-problem/m-p/1658675#M23339 <P>Hi,&nbsp;I want configure SPI Dma Fast transfer for a Sequence.by EB tresos. But in its User Manual&nbsp; it sad :</P><P><FONT color="#FF0000">Number of ScatterGather elements will equal to SpiMaxDmaFastTransfer ∗ 2 + total number of Jobs in</FONT><BR /><FONT color="#FF0000">Sequence.</FONT></P><P><FONT color="#000000">Why total number of Jobs in Sequence have to use a ScatterGather elements.And this ScatterGather elements&nbsp;&nbsp;</FONT>Where it should link to.</P><P>&nbsp;</P><P>&nbsp;</P> Sat, 27 May 2023 03:20:04 GMT Emiya 2023-05-27T03:20:04Z https://community.nxp.com/t5/S32K/In-S32K144-Used-Spi-AsyncTransmit-have-some-problem/m-p/1658675#M23339 <P>Hi,&nbsp;I want configure SPI Dma Fast transfer for a Sequence.by EB tresos. But in its User Manual&nbsp; it sad :</P><P><FONT color="#FF0000">Number of ScatterGather elements will equal to SpiMaxDmaFastTransfer ∗ 2 + total number of Jobs in</FONT><BR /><FONT color="#FF0000">Sequence.</FONT></P><P><FONT color="#000000">Why total number of Jobs in Sequence have to use a ScatterGather elements.And this ScatterGather elements&nbsp;&nbsp;</FONT>Where it should link to.</P><P>&nbsp;</P><P>&nbsp;</P> Sat, 27 May 2023 03:20:04 GMT https://community.nxp.com/t5/S32K/In-S32K144-Used-Spi-AsyncTransmit-have-some-problem/m-p/1658675#M23339 Emiya 2023-05-27T03:20:04Z https://community.nxp.com/t5/S32K/In-S32K144-Used-Spi-AsyncTransmit-have-some-problem/m-p/1685334#M24961 <P>As I understand, in normal DMA, the TCD will be setup at the end of each channel/ Job.<BR />in Dma Fast transfer, we use Scatter/Gather to do that job. That why Scatter/Gather element number =&nbsp;<SPAN>SpiMaxDmaFastTransfer ∗ 2 + total number of Jobs</SPAN></P> Tue, 11 Jul 2023 03:36:03 GMT https://community.nxp.com/t5/S32K/In-S32K144-Used-Spi-AsyncTransmit-have-some-problem/m-p/1685334#M24961 cuongnguyenphu 2023-07-11T03:36:03Z