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| W5500 Datasheet, PDF (39/65 Pages) List of Unclassifed Manufacturers – Supports 8 independent sockets simultaneously | |||
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the TCP packet is retransmitted. The retransmission is repeated as many as âRCR+1â.
Even after TCP retransmission is repeated as âRCR+1â and there is no response to the
TCP retransmission, the final timeout is occurred and Sn_IR(TIMEOUT) becomes â1â.
The time of final timeout (TCPTO) of TCP retransmission is as below.
í µí±
í µí±í µí°¶í µí±í µí±í µí± = (â(í µí±
í µí±í µí±
à 2í µí±) + ((í µí±
í µí°¶í µí±
â í µí±) Ã í µí±
í µí±í µí±
í µí±í µí°´í µí±)) à 0.1í µí±í µí±
í µí±=0
N : Retransmission count, 0â¤N ⤠M
M : Minimum value when RTR x 2(M+1) > 65535 and 0 ⤠M ⤠RCR
RTRMAX : RTR x 2M
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
PTIMER (PPP Link Control Protocol Request Timer Register) [R/W] [0x001C] [0x0028]
PTIMER configures the time for sending LCP echo request. The unit of time is 25ms.
Ex) in case that PTIMER is 200,
200 * 25(ms) = 5000(ms) = 5 seconds
PMAGIC (PPP Link Control Protocol Magic number Register) [R/W] [0x001D] [0x00]
PMAGIC configures the 4bytes magic number to be used in LCP echo request.
Ex) PMAGIC = 0x01
0x001D
0x01
LCP Magic number = 0x01010101
W5500 Datasheet Version1.0 (August 2013)
39 / 65
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