14. On ? Board ? Functions ?
?
Ethernet ? PHY ? – ? U8 ?
The ? SOMDIMM ‐ LPC2478 ? provides ? an ? Ethernet ? PHY ? from ? Micrel, ? KSZ8041NL. ? The ? KSZ8041NL ? is ? a ? single ? chip ?
solution ? for ? a ? 100BASE ‐ TX/10BASE ‐ T ? physical ? layer ? transceiver. ? It ? has ? support ? for ? media ? independent ?
interface ? (MII), ? reduced ? MII ? (RMII), ? and ? HP ? MDI/MDI ‐ X ? auto ? crossover. ? This ? allows ? for ? any ? standard ?
Ethernet ? cable ? to ? be ? used, ? even ? a ? crossover ? cable. ? The ? KSZ8041NL ? is ? fully ? compliant ? to ? IEEE ? 802.3u ? with ?
support ? for ? auto ‐ negotiation ? and ? manual ? selection ? of ? 10/100Mbps ? speed ? as ? well ? as ? full ? and ? half ‐ duplex ?
modes. ?
?
For ? detailed ? information, ? please ? refer ? to ? the ? specific ? data ? sheet ? for ? this ? device ? available ? from ? the ?
manufacturer. ?
?
MicroSD ? – ? J2 ?
The ? SOMDIMM ‐ LPC2478 ? provides ? a ? MicroSD ? interface ? for ? access ? to ? a ? removable ? Flash ? memory. ? Micro ?
Secure ? Digital ? cards ? are ? one ? of ? the ? lowest ? prices ? per ? capacity ? memory ? cards ? available. ? They ? allow ? the ?
LPC2478 ? to ? have ? access ? to ? a ? much ? larger ? amount ? of ? Flash ? memory ? in ? a ? very ? small ? form ? factor. ? When ? using ?
a ? MicroSD ? card ? it ? can ? be ? accessed ? via ? the ? SPI0 ? bus ? of ? the ? LPC2478. ? At ? this ? time, ? SDHC ? MicroSD ? Cards ? are ?
not ? supported ? by ? the ? uEZ? ? software. ?
?
Reset ? Generator ? – ? U3 ?
The ? SOMDIMM ‐ LPC2478 ? utilizes ? a ? TPS3801 ? power ‐ on ? reset ? supervisor ? and ? voltage ? monitor. ? The ? TPS3801 ?
includes ? an ? external ? reset ? input ? that ? is ? connected ? to ? the ? reset ? button ? on ? the ? CARRIER ? Board. ?
?
For ? detailed ? information, ? please ? refer ? to ? the ? specific ? data ? sheet ? for ? this ? device ? available ? from ? the ?
manufacturer. ?
?
Serial ? EEPROM ? – ? U2 ?
The ? SOMDIMM ‐ LPC2478 ? includes ? a ? serial ? EEPROM, ? NXP ? PCA24S08. ? This ? device ? provides ? 1K ‐ Byte ? of ? serial ?
electrically ? erasable ? and ? programmable ? Read ‐ only ? memory ? (EEPROM). ? Data ? is ? received ? and ? transmitted ? via ?
the ? serial ? I2C ? bus. ? Access ? permissions ? limiting ? reads ? or ? writes ? can ? be ? set ? via ? the ? I2C ‐ bus ? to ? isolate ? blocks ? of ?
memory ? from ? improper ? access. ?
?
PCA24S08 ? Device ? I2C ? Bus ? 2 ? Address ? = ? 0xA8 ?
?
For ? detailed ? information, ? please ? refer ? to ? the ? specific ? data ? sheet ? for ? this ? device ? available ? from ? the ?
manufacturer. ?
?
15 ?
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