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AOpen AX4spb-un Manual

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PSB Clock means the external bus clock of CPU.
CPU internal clock = CPU PSB Clock x CPU Clock Ratio
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A DRAM technology developed by Rambus Corporation*, to achieve high speed of memory through the use of multiple channels in
parallel by 16-bits. Basically, RDRAM uses new structure of Multibank, which is quite different from FPM, EDO, SDRAM. Using different
memory module as well, RDRAM uses “RIMM” with transfer rate of 600/700/800MHz, providing bandwidth as high to 1.6GB.
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184-pin memory module that supports RDRAM memory technology. A RIMM memory module may contain up to maximum of 16
RDRAM devices.
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SDRAM is one of the DRAM technologies that allow DRAM to use the same clock as the CPU host bus (EDO and FPM are
asynchronous and do not have clock signal). It is similar as PBSRAM to use burst mode transfer. SDRAM comes in 64-bit 168-pin DIMM
and operates at 3.3V, and have been gradually replaced by DDR SDRAM.
… 113 …


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