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W7500x Reference Manual Version1.1.0
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At the TCP packet retransmission timeout, WZTOE transmits TCP packets (SYN, FIN, RST, DATA
packets) and waits for the acknowledgement (ACK) during the configured RTR time and RCR.
If there is no ACK from the peer, a temporary timeout occurs and the TCP packet is
retransmitted. The retransmission is repeated as many as ‘RCR+1’. Even after TCP
retransmission is repeated as ‘RCR+1’ and there is no response to the TCP retransmission, the
final timeout is occurred and Sn_IR(TIMEOUT) becomes ‘1’. The time of final timeout (TCPTO)
of TCP retransmission is as below.
𝑇𝐶𝑃
𝑇𝑂
= (∑(𝑅𝑇𝑅 × 2
𝑁
) + ((𝑅𝐶𝑅 − 𝑀) × 𝑅𝑇𝑅
𝑀𝐴𝑋
)
𝑀
𝑁=0
) × 0.1𝑚𝑠
N : Retransmission count, 0≤N ≤ M
M : Minimum value when RTR x 2
(M+1)
> 65535 and 0 ≤ M ≤ RCR
RTRMAX : RTR x 2
M
Ex) When RTR = 2000(0x07D0), RCR = 8(0x0008),
ARP
TO
= 2000 X 0.1ms X 9 = 1800ms = 1.8s
TCP
TO
= (0xFA00) X 0.1ms
= (2000 + 4000 + 8000 + 16000 + 32000 + ((8 - 4) X 64000)) X 0.1ms
= 318000 X 0.1ms = 31.8s
UIPR (Unreachable IP address Register)
Address Offset : 0x6050
Reset value : 0x0000_0000
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
16
UIP[31:24]
UIPR[23:16]
R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
UIPR[15:8]
UIPR[7:0]
R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W
Содержание W7500
Страница 28: ...W7500x Reference Manual Version1 1 0 28 399 Memory map Figure 2 W7500x memory map ...
Страница 324: ...W7500x Reference Manual Version1 1 0 324 399 Figure 46 UART character frame ...
Страница 391: ...W7500x Reference Manual Version1 1 0 391 399 1 SSP1 must not drive the SSPTXD output in slave mode ...