W7100A WIZnet, W7100A Datasheet - Page 126

• 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

© Copyright 2011 WIZnet Co., Inc. All rights reserved.
}

it is larger than MTU, it is automatically divided by MTU unit and transmits.
The Sn_DIPR0 is set “255.255.255.255” when user wants to broadcast.
{/* first, get the free TX memory size */
FREESIZE:
}
The size of DATA which user wants to transmit cannot be larger than Internal TX memory. If
freesize = Sn_TX_FSR;
if (freesize < len) goto FREESIZE;
/* Write the value of remote_ip, remote_port to the SOCKET n Destination IP Address
Sn_DIPR = remote_ip;
Sn_DPORT = remote_port;
/* calculate offset address */
dst_mask = Sn_TX_WR & gSn_TX_MASK;
/* calculate start address(physical address) */
dst_ptr = gSn_TX_BASE + dst_mask;
/* if overflow SOCKET TX memory */
if ( (dst_mask + len) > (gSn_TX_MASK + 1) )
{/* copy upper_size bytes of source_address to dst_ptr */
}
else
{/* copy len bytes of source_address to dst_ptr */
}
/* increase Sn_TX_WR as length of len */
Sn_TX_WR += len;
/* set SEND command */
Sn_CR = SEND;
Check send data / Sending process
Register(Sn_DIPR), SOCKET n Destination Port Register(Sn_DPORT). */
upper_size = (gSn_TX_MASK + 1) – dst_mask;
wizmemcpy((0x000000 + source_address), (0xFE0000 + dst_ptr), upper_size);
/* update source_address */
source_address += upper_size;
/* copy left_size bytes of source_address to gSn_TX_BASE */
left_size = send_size – upper_size;
wizmemcpy((0x000000 + source_address), (0xFE0000 + gSn_TX_BASE), left_size);
wizmemcpy((0x000000 + source_address), (0xFE0000 + dst_ptr), len);
// len is send size
// dst_ptr is physical start address
// dst_mask is offset address
Ver. 1.12
126