CENTURY MICRO developed a memory module which
can operate stably at 200MHz(DDR400) or faster clock frequency.
It is
mounted resistors and capacitors are smaller than the traditional size,
its signals are wired efficiently and simply,
and many capacitors which
are placed regularly on the PCB are mounted very near the SDRAM's power
supply pin.
In addition, the SDRAM's power supply pins are connected
immediately through the same outer-layer by way of the nearby
capacitors
to the inner-power-layer by thick, short wires and the
VIAs.
The capacitors, which were placed regularly, look like part of
the SDRAM, support very efficient power supply.
| ‘ CAD
Image |
 | |
| ‘Trademark |
 |
Our CENTURY trademark is stamped on all PCBs
we release.
It is a proof of our brand, design, and
Japanese product. | |
| ‘
Balanced power supply |
It is balanced by 59 capacitors.
They are placed regularly near the SDRAM's
power supply pins. |
 | |
| ‘
Accurate differential clock wiring |
 |
The differential clock signals are connected
almost perfectly, keeping the wiring paired.
In addition,
enough clearance is reserved between the differential clock
signals and the other signals not to receive external
noise.
It is a good design which considered balance with
the other layers. | |
| ‘
Tolerance of wire length |
The tolerance is less than +/-0.025mm. An
auto-router was never used. All wiring was done by hand at our
laboratory.
All signals are wired precisely, and the
residual space is filled out by the GND copper plane.
This
wiring pattern is an environment-friendly design which
reinforces the power supply, shields out noise, and reduces
loss of copperplate. |
 | |
The total
quantity of components is 195. It was a result of
cost-performance consideration.
The DDR400 symbolizes
quality, built by CENTURY MICRO, a company which can design,
make, and sell original memory modules. |
‘ 1st
Outer-layer
 |
‘ 6th Outer-layer
 |
|
|
| |
|
