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CY8C3445PVI-094 芯片解密
时间:2010-05-31 14:10:50来源:www.pcbsjx.cn 作者:龙人计算机 点击:

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  WHEN THE FAIRNESS ALGORITHM IS DISABLED, DMA ACCESS IS GRANTED
  BASED SOLELY ON THE PRIORITY LEVEL; NO BUS BANDWIDTH GUARANTEES
  ARE MADE.
  4.4.4 TRANSACTION MODES SUPPORTED
  THE FLEXIBLE CONFIGURATION OF EACH DMA CHANNEL AND THE ABILITY TO
  CHAIN MULTIPLE CHANNELS ALLOW THE CREATION OF BOTH SIMPLE AND
  COMPLEX USE CASES. GENERAL USE CASES INCLUDE, BUT ARE NOT
  LIMITED TO:
  4.4.4.1 SIMPLE DMA
  IN A SIMPLE DMA CASE, A SINGLE TD TRANSFERS DATA BETWEEN A
  SOURCE AND SINK (PERIPHERALS OR MEMORY LOCATION).
  4.4.4.2 AUTO REPEAT DMA
  AUTO REPEAT DMA IS TYPICALLY USED WHEN A STATIC PATTERN IS REPETITIVELY
  READ FROM SYSTEM MEMORY AND WRITTEN TO A PERIPHERAL. THIS
  IS DONE WITH A SINGLE TD THAT CHAINS TO ITSELF.
  4.4.4.3 PING PONG DMA
  A PING PONG DMA CASE USES DOUBLE BUFFERING TO ALLOW ONE BUFFER
  TO BE FILLED BY ONE CLIENT WHILE ANOTHER CLIENT IS CONSUMING THE
  DATA PREVIOUSLY RECEIVED IN THE OTHER BUFFER. IN ITS SIMPLEST FORM,
  THIS IS DONE BY CHAINING TWO TDS TOGETHER SO THAT EACH TD CALLS
  THE OPPOSITE TD WHEN COMPLETE.
  4.4.4.4 CIRCULAR DMA
  CIRCULAR DMA IS SIMILAR TO PING PONG DMA EXCEPT IT CONTAINS MORE
  THAN TWO BUFFERS. IN THIS CASE THERE ARE MULTIPLE TDS; AFTER THE LAST
  TD IS COMPLETE IT CHAINS BACK TO THE FIRST TD.
  4.4.4.5 SCATTER GATHER DMA
  IN THE CASE OF SCATTER GATHER DMA, THERE ARE MULTIPLE NONCONTIGUOUS
  SOURCES OR DESTINATIONS THAT ARE REQUIRED TO EFFECTIVELY
  CARRY OUT AN OVERALL DMA TRANSACTION. FOR EXAMPLE, A PACKET MAY
  NEED TO BE TRANSMITTED OFF OF THE DEVICE AND THE PACKET ELEMENTS,
  INCLUDING THE HEADER, PAYLOAD, AND TRAILER, EXIST IN VARIOUS
  NONCONTIGUOUS LOCATIONS IN MEMORY. SCATTER GATHER DMA ALLOWS
  THE SEGMENTS TO BE CONCATENATED TOGETHER BY USING MULTIPLE TDS
  IN A CHAIN. THE CHAIN GATHERS THE DATA FROM THE MULTIPLE LOCATIONS.
  A SIMILAR CONCEPT APPLIES FOR THE RECEPTION OF DATA ONTO THE
  DEVICE. CERTAIN PARTS OF THE RECEIVED DATA MAY NEED TO BE
  SCATTERED TO VARIOUS LOCATIONS IN MEMORY FOR SOFTWARE PROCESSING
  CONVENIENCE. EACH TD IN THE CHAIN SPECIFIES THE LOCATION FOR
  EACH DISCRETE ELEMENT IN THE CHAIN.
  4.4.4.6 PACKET QUEUING DMA
  PACKET QUEUING DMA IS SIMILAR TO SCATTER GATHER DMA BUT SPECIFICALLY
  REFERS TO PACKET PROTOCOLS. WITH THESE PROTOCOLS, THERE MAY
  BE SEPARATE CONFIGURATION, DATA, AND STATUS PHASES ASSOCIATED
  WITH SENDING OR RECEIVING A PACKET.
  FOR INSTANCE, TO TRANSMIT A PACKET, A MEMORY MAPPED CONFIGURATION
  REGISTER CAN BE WRITTEN INSIDE A PERIPHERAL, SPECIFYING THE
  OVERALL LENGTH OF THE ENSUING DATA PHASE. THE CPU CAN SET UP
  THIS CONFIGURATION INFORMATION ANYWHERE IN SYSTEM MEMORY AND
  COPY IT WITH A SIMPLE TD TO THE PERIPHERAL. AFTER THE CONFIGURATION
  PHASE, A DATA PHASE TD (OR A SERIES OF DATA PHASE TDS) CAN
  BEGIN (POTENTIALLY USING SCATTER GATHER). WHEN THE DATA PHASE
  TD(S) FINISH, A STATUS PHASE TD CAN BE INVOKED THAT READS SOME
  MEMORY MAPPED STATUS INFORMATION FROM THE PERIPHERAL AND
  COPIES IT TO A LOCATION IN SYSTEM MEMORY SPECIFIED BY THE CPU
  FOR LATER INSPECTION. MULTIPLE SETS OF CONFIGURATION, DATA, AND
  STATUS PHASE “SUBCHAINS” CAN BE STRUNG TOGETHER TO CREATE LARGER
  CHAINS THAT TRANSMIT MULTIPLE PACKETS IN THIS WAY. A SIMILAR
  CONCEPT EXISTS IN THE OPPOSITE DIRECTION TO RECEIVE THE PACKETS.

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