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CS8900A-IQ3Z Fiches technique(PDF) 5 Page - Cirrus Logic

No de pièce CS8900A-IQ3Z
Description  Crystal LAN ??ISA Ethernet Controller
Download  138 Pages
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Fabricant  CIRRUS [Cirrus Logic]
Site Internet  http://www.cirrus.com
Logo CIRRUS - Cirrus Logic

CS8900A-IQ3Z Fiches technique(HTML) 5 Page - Cirrus Logic

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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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