NXP Semiconductors freescale K51 Series Reference Manual

Table 49-35. Format of the ADMA1 descriptor table (continued)Act2 Act1 Symbol Comment 31-28 27-120 0 nop No operation Don't care0 1 set Set data length 0000 Data length1 0 tran Transfer data Data address1 1 link Link descriptor Descriptor addressValid Valid = 1 indicates this line of descriptor is effective. If Valid = 0 generate ADMA errorInterrupt and stop ADMA.End End = 1 indicates current descriptor is the ending one.Int Int = 1 generates DMA interrupt when this descriptor is processed.Advanced DMADMA InterruptTransfer CompleteBlock Gap EventPage DataPage DataSystem MemorySystem Address Register points tothe head node of Descriptor TableSystem Address RegisterData Length (invisible)FlagsFlagsStateMachineData Address (invisible)Address/Length AttributeTranLinkAddressAddressAddressAddress/LengthData LengthAddressAddressAttributeSetTran, EndDescriptor TableSDMAFigure 49-32. Concept and access method of ADMA1 descriptor tableTable 49-36. Format of the ADMA2 descriptor tableAddress field Length Reserved Attribute field63 32 31 16 15 06 05 04 03 02 01 0032-bit address 16-bit length 0000000000 Act2 Act1 0 Int End ValidAct2 Act1 Symbol Comment Operation0 0 nop No operation Don't care0 1 rsv Reserved Same as nop. Read this line andgo to next one1 0 tran Transfer data Transfer data with address andlength set in this descriptor line1 1 link Link descriptor Link to another descriptorTable continues on the next page...Functional descriptionK51 Sub-Family Reference Manual, Rev. 6, Nov 20111366 Freescale Semiconductor, Inc.