Altera Embedded Peripherals IP Instrukcja Użytkownika Strona 197
- Strona / 336
- Spis treści
- BOOKMARKI
Oceniono. / 5. Na podstawie oceny klientów
Figure 21-5: Example of Stream-to-Memory Configuration
SRC
SRC
M
Avalon-MM Master Port
S
Avalon-MM S lave P ort
Avalon-ST So urce Port
Avalon-ST S ink P ort
SO PC Builder Syst em
Altera FPG A
Scatter Gather DMA Con troller Core
Rd
S
M
Wr
M
M
comma nd
st atus
SNK
Con trol
&
Sta tus
Regis ters
Nios II
Proces sor
DDR2
SDRAM
Memo ry
Controller
System Interconne ct Fabric
Memo ry
Descriptor
Table
Des c riptor
Proc es sor
Block
SNK
DMA Write Block
Streaming
Compon ent
SR C
DMA Descriptors
DMA descriptors specify data transfers to be performed. The SG-DMA core uses a dedicated interface to
read and write the descriptors. These descriptors, which are stored as a linked list, can be stored on an on-
chip or off-chip memory and can be arbitrarily long.
Storing the descriptor list in an external memory frees up resources in the FPGA; however, an external
descriptor list increases the overhead involved when the descriptor processor reads and updates the list.
The SG-DMA core has an internal FIFO to store descriptors read from memory, which allows the core to
perform descriptor read, execute, and write back operations in parallel, hiding the descriptor access and
processing overhead.
The descriptors must be initialized and aligned on a 32-bit boundary. The last descriptor in the list must
have its OWNED_BY_HW bit set to 0 because the core relies on a cleared OWNED_BY_HW bit to stop processing.
See the DMA Descriptors section for the structure of the DMA descriptor.
Descriptor Processing
The following steps describe how the DMA descriptors are processed:
1. Software builds the descriptor linked list. See the Building and Updating Descriptors List section for
more information on how to build and update the descriptor linked list.
2. Software writes the address of the first descriptor to the next_descriptor_pointer register and
initiates the transfer by setting the RUN bit in the control register to 1. See the Software Programming
Model section for more information on the registers.
On the next clock cycle following the assertion of the RUN bit, the core sets the BUSY bit in the status
register to 1 to indicate that descriptor processing is executing.
3. The descriptor processor block reads the address of the first descriptor from the
next_descriptor_pointer register and pushes the retrieved descriptor into the command FIFO,
which feeds commands to both the DMA read and write blocks. As soon as the first descriptor is read,
the block reads the next descriptor and pushes it into the command FIFO. One descriptor is always
read in advance thus maximizing throughput.
4. The core performs the data transfer.
21-6
DMA Descriptors
UG-01085
2014.24.07
Altera Corporation
Scatter-Gather DMA Controller Core
Send Feedback
- 101 Innovation Drive 1
- San Jose, CA 95134 1
- Contents 2
- Altera Corporation 10
- Introduction 14
- Device Support 15
- December 16
- Initial release. — 16
- SDRAM Controller Core 17
- Avalon-MM Interface 18
- Off-Chip SDRAM Interface 18
- Memory Profile Page 21
- Timing Page 22
- SDRAM Memory Model 23
- Symptoms of an Untuned PLL 26
- Example Calculation 27
- Parameter Symbol 28
- Value (ns) in -7 Speed Grade 28
- Min. Max 28
- Parameter Symbol Value (ns) 28
- Tri-State SDRAM 31
- Configuration Parameter 32
- Interface 33
- Reset and Clock Requirements 38
- Architecture 38
- Block Level Usage Model 39
- Compact Flash Core 41
- Required Connections 42
- (32-bit Word Address) 54
- Register Name R/W 54
- Bit Description 54
- JTAG UART Core 58
- Read and Write FIFOs 59
- JTAG Interface 59
- Host-Target Connection 59
- Simulation Settings 61
- UART Core 70
- RS-232 Interface 71
- Transmitter Logic 71
- Instantiating the Core 72
- Data Bits, Stop Bits, Parity 73
- Synchronizer Stages 74
- Flow Control 74
- Streaming Data (DMA) Control 74
- Request Description 79
- Bit Name Access Description 81
- May 2008 86
- 16550 UART 87
- Unsupported Features 88
- General Architecture 90
- Configuration Parameters 90
- DMA Support 91
- FPGA Resource Usage 91
- Timing and Fmax 92
- Avalon-MM Slave 93
- Overrun/Underrun Conditions 94
- Hardware Auto Flow-Control 95
- 16550 UART API 98
- Private APIs 99
- UART Device Structure 100
- Figure 9-7: 101
- Driver Examples 102
- UG-01085 103
- 2014.24.07 103
- Document Revision History 106
- SPI Core 107
- txdata 108
- Receiver Logic 109
- Master and Slave Modes 109
- Slave Mode Operation 110
- Multi-Slave Environments 110
- Configuration 111
- Data Register Settings 112
- Timing Settings 112
- Software Programming Model 113
- Software Files 114
- Register Map 115
- # Name Description 116
- Date and 118
- Document 118
- Core Overview 119
- Functional Description 119
- Interrupt Behavior 121
- PIO Core 123
- Data Input and Output 124
- Edge Capture 124
- IRQ Generation 124
- Example Configurations 125
- Input Options 126
- Operation 132
- PCI Lite Core 135
- Avalon-MM Ports 137
- Prefetchable Avalon-MM Master 137
- I/O Avalon-MM Master 138
- PCI Bus Access Slave 138
- Master and Target Performance 139
- Space Indicator 141
- (Bits 1:0) 141
- Description 141
- Avalon-to-PCI Write Request 142
- Ordering of Requests 143
- Send Feedback 145
- PCI Timing Constraint Files 146
- Simulation Considerations 147
- Simulation Flow 149
- MDIO Core 151
- MDIO Frame Format (Clause 45) 152
- MDIO Clock Generation 153
- Interfaces 153
- Parameter 154
- Configuration Registers 154
- On-Chip FIFO Memory Core 156
- Offset Bits Field Description 158
- FIFO Settings 161
- Interface Parameters 161
- Software Control 163
- Field Type Description 164
- Bit(s) Name Description 164
- Software Example 166
- On-Chip FIFO Memory API 167
- Multi-Channel Shared FIFO 176
- Parameters 177
- Address Width 178
- Name Access Reset 180
- Bytes Converter Cores 185
- Feature Property 186
- Transaction 190
- DMA Descriptors 197
- Error Conditions 198
- Signal Type Description 199
- Timeouts 206
- Data Structure 207
- SG-DMA API 208
- Name Description 209
- Overview 217
- Feature Description 217
- Component Interface 220
- Descriptor Slave Port 221
- Component GUI 222
- Byte Lanes 223
- Read and Write Address Fields 224
- Length Field 224
- Sequence Number Field 225
- Read and Write Stride Fields 225
- Control Field 225
- Bit Sub-Field Name Definition 226
- Register Map of mSGDMA 228
- Status Register 229
- Control Register 229
- Bit Name Description 230
- Offset Access 3 2 1 0 230
- Unsupported Feature 231
- DMA Controller Core 232
- Setting Up DMA Transactions 233
- Advanced Options 235
- Video Sync Generator 242
- Parameter Name Description 244
- Horizontal sync pulse 245
- Horizontal front porch 245
- Horizontal blank pixels 245
- Pixel Converter 246
- Interval Timer Core 249
- Counter Size 251
- Hardware Options 251
- Bit Name R/W/C Description 255
- Mutex Core 258
- Mutex API 260
- Mailbox Core 264
- Mailbox API 267
- Functional Blocks 273
- Register Maps 275
- Run-time Initialization 285
- Board Support Package 285
- VIC IRQ RRS RIL 291
- November 293
- Altera FPGA 294
- Core Behavior 295
- System ID Core 298
- Performance Counter Core 301
- Global Counter 302
- Using the Performance Counter 304
- Name (1) Meaning 305
- Performance Counter API 306
- PERF_START_MEASURING() 307
- PERF_STOP_MEASURING() 307
- PERF_BEGIN() 307
- PERF_END() 308
- PLL Cores 312
- Registers 313
- PLL Core 313
- ALTPLL Megafunction 313
- Instantiating the PLL Core 314
- Altera MSI to GIC Generator 320
- Interrupt Servicing Process 321
- Registers of Component 322
- Altera SMBus Core Interface 324
- Component Parameterization 326
- Frequency Register 331
- 32-bit Counter 332
- Software Access 334
- Implementation Details 335
- IP Caveats 336
Powiązane produkty i podręczniki dla Urządzenia pomiarowe Altera Embedded Peripherals IP
Urządzenia pomiarowe Altera Nios II Embedded Evaluation Kit Cyclone III Editio Instrukcja Użytkownika
(80 strony)
(80 strony)
Urządzenia pomiarowe Altera Phase-Locked Loop Reconfiguration IP Core Instrukcja Użytkownika
(51 strony)
(51 strony)
Urządzenia pomiarowe Altera Serial Digital Interface (SDI) MegaCore Function Instrukcja Użytkownika
(140 strony)
(140 strony)
Urządzenia pomiarowe Altera 100G Development Kit, Stratix V GX Edition Instrukcja Użytkownika
(44 strony)
(44 strony)
Urządzenia pomiarowe Altera Stratix V Avalon-MM Interface for PCIe Solutions Instrukcja Użytkownika
(184 strony)
(184 strony)
© 2020, manymanuals.pl. Wszelkie prawa zastrzeżone. | 0.033 s |
Manymanuals.com
Manymanuals.de
Manymanuals.fr
Manymanuals.it
Manymanuals.pl
Manymanuals.cz
Manymanuals.es
Manymanuals-pt.com
Komentarze do niniejszej Instrukcji