MPC8544COMEDEV Freescale Semiconductor, MPC8544COMEDEV Datasheet - Page 978

• Manufacturer Part Number: MPC8544COMEDEV
• Description: KIT DEV EXPRESS MPC8544COM
• Manufacturer: Freescale Semiconductor
• Type: MPUr

Specifications of MPC8544COMEDEV

• Contents: Board
• For Use With/related Products: MPC8544
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

DMA Controller
Figure 16-25
16-36
Current list descriptor Address Register
describes the DMA transaction flow.
MPC8544E PowerQUICC III Integrated Host Processor Family Reference Manual, Rev. 1
List Descriptor
List Descriptor
List Descriptor
Descriptors In Memory
Link Descriptor (EOLND/EOLSD)
Link Descriptor (EOLND)
Link Descriptor (EOLND)
.
.
.
.
Link Descriptor
.
Link Descriptor
Link Descriptor
.
.
Link Descriptor
Link Descriptor
Link Descriptor
Figure 16-25. DMA Transaction Flow with DMA Descriptors
DMA Controller Flow (Extended Mode)
MR n [CS] is set by software after programming
descriptors in memory
Fetch the first list descriptor using the CLSDAR n address
Write NLSDAR n , CLNDAR n
Fetch the first link descriptor
Write programming model registers
Begin DMA transfer using SAR n , SATR n , DAR n , DATR n
After transfer check if NLNDAR n [EOLND] is set
Move NLNDAR n to CLNDAR n
Fetch the current link descriptor
Write programming model registers
Begin DMA transfer using SAR n , SATR n , DAR n , DATR n
After DMA transfer check if NLNDAR n [EOLND] is set
Check if NLSDAR n [EOLSD] is set
Move NLSDAR n to CLSDAR n
Fetch the current list descriptor
Write NLSDAR n , CLNDAR n
Move NLNDAR n to CLNDAR n
Fetch the first link descriptor
Write programming model registers
Begin DMA transfer using SAR n , SATR n , DAR n , DATR n
After DMA transfer check if NLNDAR n [EOLND] is set
Move NLNDAR n to CLNDAR n
Fetch the current link descriptor
Write programming model registers
Begin DMA transfer using SAR n , SATR n , DAR n , DATR n
After DMA transfer check if NLNDAR n [EOLND] is set
Check if NLSDAR n [EOLSD] is set
Move NLSDAR n to CLSDAR n
Fetch the current list descriptor
Write NLSDAR n , CLNDAR n
Fetch the first link descriptor
Write programming model registers
Begin DMA transfer using SAR n , SATR n , DAR n , DATR n
After DMA transfer check if NLNDAR n [EOLND] is set
Move NLNDAR n to CLNDAR n
Fetch the current link descriptor
Write programming model registers
Begin DMA transfer using SAR n , SATR n , DAR n , DATR n
After DMA transfer check if NLNDAR n [EOLND] is set
Check if NLSDAR n [EOLSD] is set
Clear SR n [CB]
DMA Transfer Complete
Freescale Semiconductor
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