W7100A WIZnet, W7100A Datasheet - Page 124

• Manufacturer Part Number: W7100A
• Description: 8-bit Microcontrollers - MCU 8051 CORE+HARDWIRED TCP/IP+MAC+PHY
• Manufacturer: WIZnet

Specifications of W7100A

• Rohs: yes
• Core: 8051
• Data Bus Width: 8 bit
• Maximum Clock Frequency: 25 MHz
• Program Memory Size: 255 B
• Data Ram Size: 64 KB
• On-chip Adc: No
• Operating Supply Voltage: 3 V to 3.6 V
• Operating Temperature Range: - 40 C to + 80 C
• Package / Case: LQFP-100
• Mounting Style: SMD/SMT
• Interface Type: UART
• Program Memory Type: Flash

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}
Second Method :
{
}

as below.
contains transmitter’s information (IP address, Port number) and the length of DATA packet.
The UDP can receive UDP data from many others. User can classify the transmitter by
transmitter’s information of PACKET-INFO. It also receives broadcast SOCKET by using
“255.255.255.255” IP address. So the host should ignore unwanted reception by analysis of
transmitter’s information.
that DATA and also cannot receive fragmented DATA.
{/* first, get the received size */
Process the received UDP data in Internal RX memory. The structure of received UDP data is
The received UDP data consists of 8bytes PACKET-INFO, and DATA packet. The PACKET-INFO
If the DATA size of SOCKET n is larger than Internal RX memory free size, user cannot receive
if (Sn_RX_RSR != 0x00000000) goto Receiving Process stage;
len = Sn_RX_RSR;
/* calculate offset address */
src_mask = Sn_RX_RD & gSn_RX_MASK;
/* calculate start address(physical address) */
src_ptr = gSn_RX_BASE + src_mask;
/* read head information (8 bytes) */
header_size = 8;
/* if overflow SOCKET RX memory */
if ( (src_mask + header_size) > (gSn_RX_MASK + 1) )
{/* copy upper_size bytes of src_ptr to header_addr */
Receiving process
upper_size = (gSn_RX_MASK + 1) – src_mask;
wizmemcpy((0xFE0000 + src_ptr), (0x000000 + header_addr), upper_size);
/* update header_addr*/
// len is received size
Figure 9.6 The received UDP data format
// src_ptr is physical start address
// src_mask is offset address
Ver. 1.12
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