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COM20019I3V-HD Datasheet(PDF) 11 Page - SMSC Corporation |
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COM20019I3V-HD Datasheet(HTML) 11 Page - SMSC Corporation |
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11 / 70 page  Cost Competitive ARCNET (ANSI 878.1) Controller with 2K x 8 On-Chip RAM SMSC COM20019I 3.3V Rev.C Page 11 Rev. 10-31-06 DATASHEET Figure 3.1 - COM20019I 3V OPERATION 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 656 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 (6.72 S)* TA? Broadcast? Transmit Free Buffer Enquiry No Activity 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 1.168 mS for 597.6 us? for 597.6 us? for 597.6 us? Y N N Y Y N N Y N N N N 1 Y Y Y Y Y Y Y N Y Read Node ID 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 312.5 Kbps. |
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