Altera Stratix V Avalon-ST Manual do Utilizador Página 225

  • Descarregar
  • Adicionar aos meus manuais
  • Imprimir
  • Página
    / 293
  • Índice
  • MARCADORES
  • Avaliado. / 5. Com base em avaliações de clientes
Vista de página 224
Each subsequent descriptor consists of a minimum of four dwords of data and corresponds to one DMA
transfer. (A dword equals 32 bits.)
Note: The chaining DMA descriptor table should not cross a 4 KByte boundary.
Table 17-7: Chaining DMA Descriptor Table
Byte Address
Offset to Base
Source
Descriptor Type Description
0x0
Descriptor Header
Reserved
0x4 Reserved
0x8 Reserved
0xC EPLAST - when enabled by the EPLAST_ENA bit in the
control register or descriptor, this location records the
number of the last descriptor completed by the chaining
DMA module.
0x10
Descriptor 0
Control fields, DMA length
0x14 Endpoint address
0x18 RC address upper dword
0x1C RC address lower dword
0x20
Descriptor 1
Control fields, DMA length
0x24 Endpoint address
0x28 RC address upper dword
0x2C RC address lower dword
. . .
0x ..0
Descriptor <n>
Control fields, DMA length
0x ..4 Endpoint address
0x ..8 RC address upper dword
0x ..C RC address lower dword
17-14
Chaining DMA Descriptor Tables
UG-01097_avst
2014.12.15
Altera Corporation
Testbench and Design Example
Send Feedback
Vista de página 224
1 2 ... 220 221 222 223 224 225 226 227 228 229 230 ... 292 293

Comentários a estes Manuais

Sem comentários