参数资料
型号: DS80C400-FNY
厂商: Maxim Integrated Products
文件页数: 71/97页
文件大小: 0K
描述: IC MCU 75MHZ 16MB HP 100-LQFP
产品培训模块: Lead (SnPb) Finish for COTS
产品变化通告: Product Discontinuation 20/Feb/2012
标准包装: 90
系列: 80C
核心处理器: 8051
芯体尺寸: 8-位
速度: 75MHz
连通性: 1 线,CAN,EBI/EMI,以太网,SIO,UART/USART
外围设备: 电源故障复位,WDT
输入/输出数: 64
程序存储器容量: 64KB(64K x 8)
程序存储器类型: ROM
RAM 容量: 1K x 8
电压 - 电源 (Vcc/Vdd): 1.62 V ~ 3.6 V
振荡器型: 外部
工作温度: -40°C ~ 85°C
封装/外壳: 100-LQFP
包装: 托盘
配用: DS80C400-KIT#-ND - EVAL KIT FOR DS80C400
DS80C400 Network Microcontroller
73 of 97
Figure 14. NetBoot Code Flow Chart
Next, the DS80C400 ROM searches the 1-Wire bus for an external device (separate from the device containing the
MAC address) that contains an IP address and TFTP server IP address. In order to correctly acquire the IP and
TFTP server addresses from an external 1-Wire device, the data read from the device must conform to a specific
format. This format is shown in Figure 15.
Figure 15. 1-Wire IP and TFTP Server IP Address Format
If the IP and TFTP server addresses cannot be acquired from a 1-Wire device, the NetBoot process uses DHCP to
get this information. The DS80C400 broadcasts its MAC address in a DHCP Discover packet. A DHCP server, if
available, should then respond with an IP address offering. The DS80C400 subsequently requests the IP address,
to which the DHCP server must acknowledge. In the DHCP acknowledge packet, the TFTP server IP address is
then read from the “next server IP” field. Because some DHCP servers do not allow configuration of the “next
server IP” field, the DS80C400 recognizes the site-specific option 150 (also used on Cisco IP phones to get TFTP
server IP addresses). When option 150 is present in the acknowledge packet, it will take precedence over the “next
server IP” field.
IPv4 or IPv6
IPv4
‘TINI’
1Dh
54h,49h,4Eh,49h
Address(4)
Gateway(4)
PrefixLength(1)
TFTP Server Address(16)
Checksum(2)
1’S COMPLEMENT
OF CRC-16 (LSB
FIRST)
29 (LENGTH)
IPV4
(BYTE
CONVERTED TO
SUBNET MASK)
NETBOOT
INITIALIZATION CODE
ACQUIRE MAC
ADDRESS FROM DS2502
1-WIRE DEVICE
WITH IP
ADDRESS
FIND USER CODE
TFTP/FLASH WRITE
DHCP
GET IP ADDRESS FROM
1-WIRE DEVICE
NetBoot PROCESS
Y
N
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