Altera Embedded Peripherals IP Manual de usuario Pagina 196

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Figure 21-3: Example of Memory-to-Memory Configuration
M
Ava lon-MM Ma ste r P ort
S
Avalo n-MM S lave P ort
Avalo n-ST So ur ce Port
SRC
Ava lon-S T S in k P ort
SNK
SO PC Builder S ys te m
Altera FPG A
De sc riptor
Proce ss o r
Blo ck
S catte r Ga ther DMA Con troller Core
Rd
S
M
Wr
co mm and
st atus
M M
co mm and
st atus
M
Con trol
&
Sta tus
Re gist ers
DMA Write Bloc k
SN K
DMA Re ad B lock
SR C
Data
FIFO
Nio s II
Proces s o r
DDR2
SDRA M
Memory
Con trolle r
S ys tem Inte rcon ne ct F ab ric
Memory
De scripto r
Ta ble
Memory-to-Stream Configuration
Memory-to-stream configurations include the descriptor processor and DMA read blocks.
In this example, the Nios II processor and descriptor table are in the FPGA. Data from an external DDR2
SDRAM is read by the SG-DMA controller and written to an on-chip streaming peripheral.
Figure 21-4: Example of Memory-to-Stream Configuration
SNK
M
Avalon-MM Master Port
S
Avalon-MM S lave P ort
Avalon-ST S ource Port
Avalon-ST Sink P ort
S OPC Builder Syste m
Altera FPGA
Sc atter Gat her DMA Controller Core
Rd
S
M
Wr
M
M
command
s tatus
SRC
Contro l
&
Status
Regis ters
Nios II
Process or
DDR2
SDR AM
Memory
Controller
Me mory
Descriptor
Tab le
DMA Read Block
Descr iptor
Processo r
Bloc k
SRC
Streaming
Component
SNK
System Interconnec t Fab ric
Stream-to-Memory Configuration
Stream-to-memory configurations include the descriptor processor and DMA write blocks. This configu‐
ration is similar to the memory-to-stream configuration as the figure below illustrates.
UG-01085
2014.24.07
Functional Blocks and Configurations
21-5
Scatter-Gather DMA Controller Core
Altera Corporation
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