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CS8900A-IQ3Z Fiches technique(PDF) 5 Page - Cirrus Logic |
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CS8900A-IQ3Z Fiches technique(HTML) 5 Page - Cirrus Logic |
5 / 138 page DS271F4 5 CS8900A Crystal LAN™ Ethernet Controller CIRRUS LOGIC PRODUCT DATASHEET 4.10.2 TxCMD Port ......................................................................................................75 4.10.3 TxLength Port ...................................................................................................76 4.10.4 Interrupt Status Queue Port .............................................................................76 4.10.5 PacketPage Pointer Port ..................................................................................76 4.10.6 PacketPage Data Ports 0 and 1 .......................................................................76 4.10.7 I/O Mode Operation ..........................................................................................76 4.10.8 Basic I/O Mode Transmit ..................................................................................76 4.10.9 Basic I/O Mode Receive ...................................................................................77 4.10.10 Accessing Internal Registers ..........................................................................77 4.10.11 Polling the CS8900A in I/O Mode ...................................................................77 5.0 OPERATION ..........................................................................................................................78 5.1 Managing Interrupts and Servicing the Interrupt Status Queue ......................................78 5.2 Basic Receive Operation .................................................................................................78 5.2.0.1 Overview .............................................................................................78 5.2.1 Terminology: Packet, Frame, and Transfer ........................................................80 5.2.1.1 Packet .................................................................................................80 5.2.1.2 Frame ..................................................................................................80 5.2.1.3 Transfer ...............................................................................................80 5.2.2 Receive Configuration ........................................................................................80 5.2.2.1 Configuring the Physical Interface .......................................................81 5.2.2.2 Choosing which Frame Types to Accept .............................................81 5.2.2.3 Selecting which Events Cause Interrupts ............................................81 5.2.2.4 Choosing How to Transfer Frames ......................................................81 5.2.3 Receive Frame Pre-Processing .........................................................................82 5.2.3.1 Destination Address Filtering ..............................................................82 5.2.3.2 Early Interrupt Generation ...................................................................82 5.2.3.3 Acceptance Filtering ............................................................................83 5.2.3.4 Normal Interrupt Generation ................................................................83 5.2.4 Held vs. DMAed Receive Frames ......................................................................83 5.2.5 Buffering Held Receive Frames .........................................................................85 5.2.6 Transferring Held Receive Frames ....................................................................85 5.2.7 Receive Frame Visibility .....................................................................................85 5.2.8 Example of Memory Mode Receive Operation ...................................................86 5.2.9 Receive Frame Byte Counter .............................................................................86 5.2.10 Receive Frame Address Filtering .....................................................................87 5.2.10.1 Individual Address Frames ................................................................87 5.2.10.2 Multicast Frames ...............................................................................87 5.2.10.3 Broadcast Frames .............................................................................87 5.2.11 Configuring the Destination Address Filter .......................................................87 5.2.12 Hash Filter ........................................................................................................88 5.2.12.1 Hash Filter Operation ........................................................................88 5.2.13 Broadcast Frame Hashing Exception ...............................................................88 5.3 Receive DMA ..................................................................................................................90 5.3.1 Overview ............................................................................................................90 5.3.2 Configuring the CS8900A for DMA Operation ....................................................90 5.3.3 DMA Receive Buffer Size ...................................................................................91 5.3.4 Receive-DMA-Only Operation ............................................................................91 5.3.5 Committing Buffer Space to a DMAed Frame ....................................................92 5.3.6 DMA Buffer Organization ...................................................................................92 5.3.7 RxDMAFrame Bit ...............................................................................................92 5.3.8 Receive DMA Example Without Wrap-Around ...................................................92 5.3.9 Receive DMA Operation for RxDMA-Only Mode ...............................................92 5.4 Auto-Switch DMA ............................................................................................................94 |
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Description similaire - CS8900A-IQ3Z |
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