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CS8900A-CQ3 Arkusz danych(PDF) 5 Page - Cirrus Logic

Numer części CS8900A-CQ3
Szczegółowy opis  Crystal LAN TM ISA Ethernet Controller
Download  137 Pages
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Producent  CIRRUS [Cirrus Logic]
Strona internetowa  http://www.cirrus.com
Logo CIRRUS - Cirrus Logic

CS8900A-CQ3 Arkusz danych(HTML) 5 Page - Cirrus Logic

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DS271PP4
5
CS8900A
Crystal LAN™ ISA Ethernet Controller
CIRRUS LOGIC PRODUCT DATASHEET
4.10.2 TTxCMD Port .................................................................................................... 75
4.10.3 TTxLength Port .................................................................................................. 75
4.10.4 TInterrupt Status Queue Port ............................................................................75
4.10.5 TPacketPage Pointer Port ................................................................................. 75
4.10.6 TPacketPage Data Ports 0 and 1 ...................................................................... 76
4.10.7 TI/O Mode Operation .........................................................................................76
4.10.8 TBasic I/O Mode Transmit ................................................................................. 76
4.10.9 TBasic I/O Mode Receive ..................................................................................76
4.10.10 TAccessing Internal Registers ......................................................................... 77
4.10.11 TPolling 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 TTerminology: 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 TReceive Configuration ....................................................................................... 80
5.2.2.1 Configuring the Physical Interface ....................................................... 80
5.2.2.2 Choosing which Frame Types to Accept ............................................. 80
5.2.2.3 Selecting which Events Cause Interrupts ............................................81
5.2.2.4 Choosing How to Transfer Frames ...................................................... 81
5.2.3 TReceive Frame Pre-Processing ........................................................................ 81
5.2.3.1 Destination Address Filtering .............................................................. 82
5.2.3.2 Early Interrupt Generation ................................................................... 83
5.2.3.3 Acceptance Filtering ............................................................................83
5.2.3.4 Normal Interrupt Generation ................................................................ 83
5.2.4 THeld vs. DMAed Receive Frames .....................................................................83
5.2.5 TBuffering Held Receive Frames ........................................................................ 83
5.2.6 TTransferring Held Receive Frames ................................................................... 85
5.2.7 TReceive Frame Visibility .................................................................................... 85
5.2.8 TExample of Memory Mode Receive Operation ................................................. 85
5.2.9 TReceive Frame Byte Counter ............................................................................86
5.3 Receive Frame Address Filtering ..................................................................................... 86
5.3.0.1 Individual Address Frames .................................................................. 87
5.3.0.2 Multicast Frames ................................................................................. 87
5.3.0.3 Broadcast Frames ............................................................................... 87
5.3.1 TConfiguring the Destination Address Filter ........................................................ 87
5.3.2 THash Filter ......................................................................................................... 88
5.3.2.1 Hash Filter Operation .......................................................................... 88
5.3.3 TBroadcast Frame Hashing Exception ................................................................ 88
5.4 Receive DMA ...................................................................................................................89
5.4.1 TOverview ........................................................................................................... 89
5.4.2 TConfiguring the CS8900A for DMA Operation ..................................................89
5.4.3 TDMA Receive Buffer Size ..................................................................................89
5.4.4 TReceive-DMA-Only Operation ........................................................................... 90
5.4.5 TCommitting Buffer Space to a DMAed Frame ................................................... 91
5.4.6 TDMA Buffer Organization ..................................................................................91
5.4.7 TRxDMAFrame Bit .............................................................................................. 91
5.4.8 TReceive DMA Example Without Wrap-Around ..................................................91
5.4.9 TReceive DMA Operation for RxDMA-Only Mode .............................................. 91
5.5 Auto-Switch DMA ............................................................................................................. 92


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