Information

Table 46-35. Format of the ADMA1 descriptor table (continued)
Act2 Act1 Symbol Comment 31-28 27-12
0 0 nop No operation Don't care
0 1 set Set data length 0000 Data length
1 0 tran Transfer data Data address
1 1 link Link descriptor Descriptor address
Valid Valid = 1 indicates this line of descriptor is effective. If Valid = 0 generate ADMA error
Interrupt 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 DMA
DMA Interrupt
Transfer Complete
Block Gap Event
Page Data
Page Data
System Memory
System Address Register points to
the head node of Descriptor Table
System Address Register
Data Length (invisible)
FlagsFlags
State
Machine
Data Address (invisible)
Address/Length
Attribute
Tran
Link
AddressAddress
Address
Address/Length
Data Length
AddressAddress
Attribute
Set
Tran, End
Descriptor Table
SDMA
Figure 46-32. Concept and access method of ADMA1 descriptor table
Table 46-36. Format of the ADMA2 descriptor table
Address field Length Reserved Attribute field
63 32 31 16 15 06 05 04 03 02 01 00
32-bit address 16-bit length 0000000000 Act2 Act1 0 Int End Valid
Act2 Act1 Symbol Comment Operation
0 0 nop No operation Don't care
0 1 rsv Reserved Same as nop. Read this line and
go to next one
1 0 tran Transfer data Transfer data with address and
length set in this descriptor line
1 1 link Link descriptor Link to another descriptor
Table continues on the next page...
Functional description
K10 Sub-Family Reference Manual, Rev. 6, Nov 2011
1404 Freescale Semiconductor, Inc.