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RCR (Retry Counter Register)
Address Offset : 0x6044
Reset value : 0x0000_0008
31
30
29
28
15
14
13
12
RCR configures the number of time of retransmission. When retransmission occurs as many as
'RCR+1', Timeout interrupt is issued (Sn_IR[TIMEOUT] = '1').
When RCR is not '0x0000_0000, RCR is used to configure the timeout period of all socket.
When RCR is '0x0000_0000', the timeout period of each socket could set by using Socket n
Retry Counter Register (Sn_RCR).
Ex) RCR = 0x0007
The timeout of WZTOE can be configurable with RTR and RCR. WZTOE has two kind timeout
such as Address Resolution Protocol (ARP) and TCP retransmission.
At the ARP (Refer to RFC 826, http://www.ietf.org/rfc.html) retransmission timeout, WZTOE
automatically sends ARP-request to the peer's IP address in order to acquire MAC address
information (used for communication of IP, UDP, or TCP). While waiting for ARP-response from
the peer, if there is no response during the configured RTR time, a temporary timeout is
occurred and ARP-request is retransmitted. It is repeated as many as 'RCR + 1' times. Even
after the ARP-request retransmissions are repeated as 'RCR+1' and there is no response to the
ARP-request, the final timeout is occurred and Sn_IR(TIMEOUT) becomes '1'. The time of final
timeout (ARP
) of ARP-request is as below.
TO
W7500x Reference Manual Version1.1.0
RTR[15:8]
0x0F
27
26
25
res
11
10
9
res
RC[7:0]
0x07
= ( ������ × 0.1���� ) × ( ������ + 1 )
������
����
24
23
22
21
8
7
6
5
R/W
R/W
R/W
20
19
18
17
res
4
3
2
1
RC[7:0]
R/W
R/W
R/W
R/W
84 / 399
16
0
R/W
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