DS31256+ datasheet(4/183 Pages) MAXIM

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DS31256 256-Channel, High-Throughput HDLC Controller

4 of 183

LIST OF FIGURES

Figure 2-1. Block Diagram.......................................................................................................................10

Figure 5-1. Status Register Block Diagram for SM and SV54 .................................................................36

Figure 6-1. Layer 1 Block Diagram..........................................................................................................46

Figure 6-2. Port Timing (Channelized and Unchannelized Applications) ................................................47

Figure 6-3. Layer 1 Register Set .............................................................................................................51

Figure 6-4. Port RAM Indirect Access .....................................................................................................53

Figure 6-5. Receive V.54 Host Algorithm ................................................................................................58

Figure 6-6. Receive V.54 State Machine.................................................................................................59

Figure 6-7. BERT Mux Diagram ..............................................................................................................60

Figure 6-8. BERT Register Set................................................................................................................61

Figure 8-1. FIFO Example .......................................................................................................................75

Figure 9-1. Receive DMA Operation........................................................................................................88

Figure 9-2. Receive DMA Memory Organization .....................................................................................89

Figure 9-3. Receive Descriptor Example.................................................................................................90

Figure 9-4. Receive Packet Descriptors ..................................................................................................91

Figure 9-5. Receive Free-Queue Descriptor............................................................................................92

Figure 9-6. Receive Free-Queue Structure .............................................................................................94

Figure 9-7. Receive Done-Queue Descriptor ..........................................................................................97

Figure 9-8. Receive Done-Queue Structure ............................................................................................99

Figure 9-9. Receive DMA Configuration RAM .......................................................................................102

Figure 9-10. Transmit DMA Operation...................................................................................................108

Figure 9-11. Transmit DMA Memory Organization ................................................................................109

Figure 9-12. Transmit DMA Packet Handling ........................................................................................110

Figure 9-13. Transmit DMA Priority Packet Handling ............................................................................111

Figure 9-14. Transmit DMA Error Recovery Algorithm ..........................................................................113

Figure 9-15. Transmit Descriptor Example ............................................................................................114

Figure 9-16. Transmit Packet Descriptors .............................................................................................115

Figure 9-17. Transmit Pending-Queue Descriptor.................................................................................116

Figure 9-18. Transmit Pending-Queue Structure...................................................................................118

Figure 9-19. Transmit Done-Queue Descriptor .....................................................................................120

Figure 9-20. Transmit Done-Queue Structure .......................................................................................122

Figure 9-21. Transmit DMA Configuration RAM ....................................................................................125

Figure 10-1. PCI Configuration Memory Map ........................................................................................130

Figure 10-2. PCI Bus Read ...................................................................................................................131

Figure 10-3. PCI Bus Write....................................................................................................................132

Figure 10-4. PCI Bus Arbitration Signaling Protocol..............................................................................133

Figure 10-5. PCI Initiator Abort..............................................................................................................133

Figure 10-6. PCI Target Retry ...............................................................................................................134

Figure 10-7. PCI Target Disconnect ......................................................................................................134

Figure 10-8. PCI Target Abort ...............................................................................................................135

Figure 10-9. PCI Fast Back-To-Back.....................................................................................................136

Figure 11-1. Bridge Mode......................................................................................................................148

Figure 11-2. Bridge Mode with Arbitration Enabled ...............................................................................148

Figure 11-3. Configuration Mode...........................................................................................................149

Figure 11-4. Local Bus Access Flowchart .............................................................................................152

Figure 11-5. 8-Bit Read Cycle ...............................................................................................................155

Figure 11-6. 16-Bit Write Cycle..............................................................................................................156

Figure 11-7. 8-Bit Read Cycle ...............................................................................................................157

Figure 11-8. 16-Bit Write (Only Upper 8 Bits Active) Cycle ...................................................................158

Figure 11-9. 8-Bit Read Cycle ...............................................................................................................159

Figure 11-10. 8-Bit Write Cycle..............................................................................................................160

Figure 11-11. 16-Bit Read Cycle ...........................................................................................................161

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