W5100 WIZnet, W5100 Datasheet - Page 36

• 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.
Sn_RX_RSR (RX Received Size Register) [R] [0x0426-0x0427, 0x0526-0x0527, 0x0626-
0x0627, 0x0726-0x0727] [0x0000]
This register notifies the data size received in RX Memory. As this value is internally
Ex) In case of 2048(0x0800) in S0_RX_RSR,
The total size of this value can be decided according to the value of RX Memory Size Register.
Sn_RX_RD (Socket n RX Read Pointer Register) [R/W] [0x0428-0x0429, 0x0528-0x0529,
0x0628-0x0629, 0x0728-0x0729] [0x0000]
This register offers the location information to read the receiving data. When reading this
register, user should read upper byte (0x0428, 0x0528, 0x0628, 0x0728) first and lower byte
(0x0429, 0x0529, 0x0629, 0x0729) later to get the correct value. It has a random value as its
initial value.
Caution: This register value is changed after the successfully executed receive command to
Sn_CR.
Ex) In case of 2048(0x0800) in S0_RX_RD,
But this value itself is not the physical address to read. So, the physical address should be
calculated as follow.
Now, read the receiving data from get_start_address as large as you want. (* There's a case
that it exceeds the RX memory upper-bound of the socket while reading. In this case, read
the receiving data to the upper-bound, and change the physical address to the gSn_RX_BASE.
calculated with the values of Sn_RX_RD and Sn_RX_WR, it is automatically changed by RECV
command of Socket n Command Register(Sn_CR) and receiving data for remote peer. When
reading this register, user should read upper byte(0x0426,0x0526,0x0626,0x0726) first and
lower byte(0x0427,0x0527,0x0627,0x0727) later to get the correct value.
1. Socket n RX Base Address (hereafter we'll call gSn_RX_BASE) and Socket n RX Mask
2. The bitwise-AND operation of two values, Sn_RX_RD and gSn_RX_MASK give result the
3. Two values get_offset and gSn_RX_BASE are added together to give result the
Address (hereafter we'll call gSn_RX_MASK) are calculated on RMSR value. Refer to
the pseudo code of the 5.1 Initialization if the detail is needed.
offset address(hereafter we'll call get_offset), in RX memory range of the socket.
physical address(hereafter, we'll call get_start_address).
0x0426
0x0428
0x08
0x08
0x0427
0x0429
0x00
0x00
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