AOpen AX4C Max, Онлайн-руководство, Страница: 170 / 186

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The ECC mode needs 8 ECC bits for 64-bit data. Each time memory is accessed; ECC bits are updated and checked by a
special algorithm. The ECC algorithm has the ability to detect double-bit error and automatically correct single-bit error while
parity mode can only detect single-bit error.
E E E E P P R R O O M M ( ( E E l l e e c c t t r r o o n n i i c c E E r r a a s s a a b b l l e e P P r r o o g g r r a a m m m m a a b b l l e e R R O O M M ) )
Also known as E
2
PROM. Both EEPROM and Flash ROM can be re-programmed by electronic signals, but the interface
technology is different. Size of EEPROM is much smaller than flash ROM.
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Traditional motherboard stores BIOS code in EPROM. EPROM can only be erased by ultra-violet (UV) light. If BIOS has to be
upgraded, you need to remove EPROM from motherboard, clear by UV light, re-program, and then insert back.
E E V V 6 6 B B u u s s
EV6 Bus is the technology of Alpha processor from Digital Equipment Corporation. EV6 bus uses both rising and falling clock
edge to transfer data, similar as DDR RAM or ATA/66 IDE bus.
EV6 Bus Speed = CPU external bus clock x 2.
200 MHz EV6 bus , 200MHz = 100 MHz external bus clock x 2