W5100 WIZnet, W5100 Datasheet - Page 24

• Manufacturer Part Number: W5100
• Description: Ethernet ICs 3-IN-1 ENET CONTR TCP/IP+MAC+PHY
• Manufacturer: WIZnet

Specifications of W5100

• Rohs: yes
• Product: Ethernet Controllers
• Data Rate: 10 Mb/s, 100 Mb/s
• Supply Voltage - Max: 3.6 V
• Supply Voltage - Min: 3 V
• Maximum Operating Temperature: + 80 C
• Package / Case: LQFP-80
• Ethernet Connection Type: 10Base-T, 100Base-TX
• Minimum Operating Temperature: - 40 C
• Mounting Style: SMD/SMT
• Standard Supported: 802.3, 802.3u

© Copyright 2009-2010 WIZnet Co., Inc. All rights reserved.
RCR (Retry Count Register) [R/W] [0x0019] [0x08]
This register sets the number of re-transmission. If retransmission occurs more than the
number recorded in RCR, Timeout Interrupt (TIMEOUT bit of Socket n Interrupt Register
(Sn_IR) is set as „1‟) will occur.
RMSR(RX Memory Size Register) [R/W] [0x001A] [0x55]
This register assigns total 8K RX Memory to each socket.
The memory size according to the configuration of S1, S0, is as below.
According to the value of S1 and S0, the memory is assigned to the sockets from socket 0
within the range of 8KB. If there is not enough memory to be assigned, the socket should not
be used. The initial value is 0x55 and the 2K memory is assigned to each 4 sockets
respectively.
Ex) When setting as 0xAA, the 4KB memory should be assigned to each socket.
However, the total memory size is 8KB. The memory is normally assigned to the socket 0 and
1, but not to the socket 2 and 3. Therefore, socket 2 and 3 can not be absolutely used.
TMSR(TX Memory Size Register) [R/W] [0x001B] [0x55]
This register is used in assigning total 8K TX Memory to sockets. Configuration can be done in
the same way of RX Memory Size Register (RMSR). The initial value is 0x55 and it is to assign
2K memory to 4 sockets respectively.
S1
S1
7
0
0
1
1
Socket 3
Socket 3
0KB
S0
6
S0
0
1
0
1
S1
5
Socket 2
Socket 2
Memory size
0KB
1KB
2KB
4KB
8KB
S0
4
S1
3
Socket 1
Socket 1
4KB
S0
2
S1
1
Socket 0
Socket 0
4KB
S0
0
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