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COM20020 Datasheet(PDF) 7 Page - SMSC Corporation |
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COM20020 Datasheet(HTML) 7 Page - SMSC Corporation |
7 / 82 page 7 Invitation to Transmit to this ID? Y N Free Buffer Enquiry to this ID? SOH? YN YN RI? Write SID to Buffer DID =0? DID =ID? Write Buffer with Packet CRC OK? LENGTH OK? DID =0? DID =ID? SEND ACK N Y N Y N Y N Broadcast Enabled? N Y N No Activity for 41 uS? Y N Set NID=ID Start Timer: T=(255-ID) Activity On Line? Y N T=0? Set RI RI? Transmit NAK Transmit ACK Set NID=ID Write ID to RAM Buffer Send Reconfigure Burst Power On Reconfigure Timer has Timed Out Start Reconfiguration Timer (420 mS)* TA? Broadcast? Transmit Free Buffer Enquiry No Activity Read Node ID FIGURE 1 - COM20020 OPERATION Pass the Token Set TA Y N ACK? NAK? 1 No Activity N Y Increment NID Send Packet Was Packet Broadcast? No Activity N ACK? Set TMA Set TA x 73 us for 37.4 us? for 37.4 us? for 37.4 us? Y N N Y Y N N Y N N N N 1 Y Y Y Y Y Y Y N Y ID refers to the identification number of the ID assigned to this node. NID refers to the next identification number that receives the token after this ID passes it. - - - - SID refers to the source identification. DID refers to the destination identification. SOH refers to the start of header character; preceeds all data packets. - YN * Reconfig timer is programmable via setup2 register bits 1, 0. Note - All time values are valid for 5 Mbps. |
Similar Part No. - COM20020_00 |
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Similar Description - COM20020_00 |
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