W6100 datasheet(130/149 Pages) WIZNET

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W6100 – Hardwired Dual TCP/IP Stack Controller

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 SOCKET-less Command

SLCR[NA] transmits unsolicited NA packet to all-node.

{

SLCR[NA] = ‘1’; /* set Unsolicited NA Command */

while(SLCR != 0x00) ; /* Wait until Unsolicited NA Command is completed*/

}

 Timeout

SLIR[TOUT] is set when the transmission is completed.

{

/* check TIMEOUT Interrupt */

if(SLIR[TOUT] == 1)

{

SLIRCLR[TOUT] = ‘1’; /* clear Interrupt */

goto SUCCESS;

}

6.7

Retransmission

6.7.1 ARP & PING & ND Retransmission

When there is no response from a destination against of ARP/PING/ND Packet, ARP/PING/ND

retransmission is performed. In retransmission process, the request packet is retransmitted

every RTR until the response packet is received. And if the count of retransmission exceeds

RCR, TIMEOUT occurs. The below table shows retransmission TIMEOUT (ARPTO, PINGTO, NDTO).

ARPTO, PINGTO, NDTO = (TIMEOUTVAL x 0.1ms) x (TIMEOUTCNT + 1)

TIMEOUTVAL = SLRTR or Sn_RTR

TIMEOUTCNT = SLRCR or Sn_RCR

Ex) TIMEOUTVAL = 2000(0x07D0), TIMEOUTCNT = 8(0x0008)

ARPTO= 2000 X 0.1ms X 9 = 1.8s

ARPTO occurs when there is no response from a destination in ARP-process by Sn_CR [CONNECT]

in TCP4 mode, Sn_CR[SEND] in UDP4 & IPRAW4 mode, and SLCR[ARP] in SOCKET-less command.

Sn_IR[TIMEOUT] or SLIR[TOUT] is set by ARPTO.

W6100 Datasheet(PDF) 130 Page - WIZnet Co., Ltd