W7100A WIZnet, W7100A Datasheet - Page 135

• 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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}
<Notice>
If the free size of the internal RX memory is smaller than the MACRAW data, a problem may
occasionally occur where some parts of that PACKET-INFO and DATA packet are stored to the
internal RX memory. Since the problem occurs as an analysis error for PACKET-INFO, it cannot
process the MACRAW data correctly. The closer the internal RX memory is to being full, the
higher the probability is for an error to occur. This problem can be resolved if user allows
some loss of the MACRAW data.
The solution is as follows:
▪ Process the internal RX memory as fast as possible to prevent that it
▪ Reduce the receiving load by reception only its MACRAW data by setting the MF (MAC Filter)
▪ If the free size of the internal RX memory is smaller than ‘1528 - Default
{
START:
/* sets MAC raw mode with enabling MAC filter */
S0_MR = 0x44;
/* sets OPEN command */
S0_CR = OPEN;
/* wait until Sn_SR is changed to SOCK_MACRAW */
if (Sn_SR != SOCK_MACRAW) S0_CR = CLOSE; goto START;
}
{/* check the free size of internal RX memory */
bit of S0_MR in sample code of SOCKET initialization.
MTU(1514)+PACKET-INFO(2) + DATA packet(8) + CRC(4)’, close the SOCKET and process all
received data. Then reopen the SOCKET. After closing the SOCKET, the received MACRAW
data from closing time can be lost.
S0_RX_RD += len;
/* extract 4 bytes CRC from internal RX memory and then ignore it */
wizmemcpy((0xFE0000 + src_ptr), (0x000000 + dummy), len);
/* set RECV command */
S0_CR = RECV;
if((S0_RXMEM_SIZE(0) * 1024) – S0_RX_RSR(0) < 1528)
{
received_size = S0_RX_RSR(0);
S0_CR = CLOSE;
while(S0_SR != SOCK_CLOSED);
/* SOCKET Closed */
/* backup Sn_RX_RSR */
/* wait until SOCKET is closed */
closes
Ver. 1.12
to full.
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