???????????????????????????????????????????????????????????豸?????????????????TCP/IPЭ???????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????豸???????????????????????????????????????????????????????е???????????????????????????????豸?????????????????????豸?????????????????·??8??????????罻??????????????????????????????·???????????????????????????????????????????????????????????罻??о?????????10/100M??????????????
???????????????CPU????32λARM????????????????6??10/100M????????????100M????????????????·??????????????????????????????·??
????1 ??????
?????????·?????????????????????????????飺CPU?????????顣???????????????????????????
????1.1 CPU???
????CPU?????????????????????????????CPU????Χ??·?????
??????????????????·10??40V??????????????·??????????????????·??????????????????????????硣????????·???????????????????CPU???????LED?????????CPU??????????·???????????????????????????·????????????????????????????·??????????·??????????????????????????????????CPU???????????????????????????????????????????????
????MAX788??????????????????????????3.3V????????????5A??????????Χ?8V??40V?????????????100kHz??
????????????CPU???Atmel?????32λARM??????????о?AT91M40800??RAM???????256K×16λ??SRAM CY7C1041BV33??
????FLASH?洢??29W400?????????????Щ??????????????????256K×16λ??AT91M40800???????????RS-232????PC?????RS-232????????????????Щ????????á?MAX823???????WATCHDOG???????????о???????????λ????
????CPU????????????????40о??????????????????????о???????????ú??????????д?????JTAG???????AT91M40800???????????????????FLASH?洢???С?
????1.2 ???????
????????????????MAC????????о?VT6510B???????о?RTL8208??ɡ???????о?????VIA?????????VT6510B????о???9??10/100M????1??1G???????384KB?????RAM???????????RAM??????????????????????;???????????????????CPU???????о????г??????????
????8??10/100M??????RMII?????Realtek??????????????о?RTL8208?????RTL8208о?????????8?????????????8???????????ó????10/100BASE-TX(???????)??100BASE-FX(??????)????????????6??10/100BASE-TX????????100BASE-FX????6??10/100BASE-TX?????????????????HR604009??RJ-45????????HR604009???????4·RJ-45?????????????????100BASE-FX???????????????????V23826?????????????????SC????
?????????????о?RTL8208?????????????λ?????74HC164???LED?????????????????????????
????????VT6510B??RTL8208?????????????2.5V?????????????????????о?MAX1818??3.3V????????2.5V??
????2 ??????
????????????????????????????????о?VT6510B??????????????????????????????????;???????????λ?????RS-232??????????????????????????????????????????????????????·??????????????????????????
???????????????????????????????????????????????
????(1)?????
???????????CPU???????????????ú?????о???????????????????????????????????????
????(2)????Э??
???????802.1d??802.1w??802.1q???PING??ARP??BOOTP??IP??TCP??UDP??????Э?顣
????(3)????????????????
???????RS-232????????????Щ?????????????ú?????????????????????????Э?????????????????????????????????????????ú??????????
????(4)????????????·???
?????????????????????????????????????????????????趨??????·???Э??????????????統??????????????????????????
???????????????????????????????y??????к????????????Щ?????????????????????????????????????????????????????????豸?????????????????????????о????????????о??????????·?????????????ARM????32λ???????????????????????????繦???
