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W5300 Datasheet(PDF) 58 Page - WIZnet Co., Ltd |
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W5300 Datasheet(HTML) 58 Page - WIZnet Co., Ltd |
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58 / 128 page  © Copyright 2008-2014 WIZnet Co.,Ltd. All rights reserved. 58 If there is no ACK from the peer, Timeout occurs and TCP packets (sent earlier) are retransmitted. The retransmissions are repeated as many as ‘RCR + 1’ times. Even after TCP packet r etransmissions are repeated ‘RCR +1’ times, if there is no ACK from the peer, final t imeout occurs and Sn_SSR is changed to ‘SOCK_CLOSED” at the same time with Sn_IR(TIMEOUT) = ‘1’ The value of final timeout (TCPTO) of TCP packet retransmission can be calculated as below, Ex) When RTR = 2000(0x07D0), RCR = 8(0x0008), ARPTO = 2000 X 0.1ms X 9 = 1800ms = 1.8s TCPTO = (0x07D0 + 0x0FA0 + 0x1F40 + 0x3E80 + 0x7D00 + 0xFA00 + 0xFA00 + 0xFA00 + 0xFA00) X 0.1ms = (2000 + 4000 + 8000 + 16000 + 32000 + ((8 - 4) X 64000)) X 0.1ms = 318000 X 0.1ms = 31.8s M TCPTO = ( Σ(RTR X 2N ) + ((RCR-M) X RTRMAX) ) X 0.1ms N=0 N : Retransmission count, 0 <= N <= M M : Minimum value when RTR X 2(M+1) > 65535 and 0 <= M <= RCR RTRMAX : RTR X 2M 58 |
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