Innoventions RAMCHECK LX, Руководство пользователя

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4. RAMCHECK LX OPERATION RAMCHECK LX OWNER’S MANUAL
Please review the on-
line manual addenda
(www.memorytesters.
com/tec_man.htm)
for more details on
DDR4, DDR3, DDR2
and DDR1 BASIC
Test operation.
The RAMCHECK
LX screen has 8 lines
of text, to improve
visibility over our
previous generation
RAMCHECK
products.
DDR1 SDRAM
Legacy EDO/FPM devices show speed as access time and cycle time in
nanosecond (nS). For example, the shortened notation 64.5/190nS on the
following left screen indicates access time of 64.5nS with a cycle time of
190nS.
EDO FPM
You will also note the ‘3v’ voltage indicator next to the access and cycle
time. The ‘3v’ (or the ‘5v’ in the right screen) marks indicate that the DUT is
being tested at 3.3V (or 5V). SDRAM devices are exclusively tested at 3.3V.
The DDR3, DDR2 and DDR1 adapters provide similar ‘1
5
V’
‘1
8
V’
and ‘2
5
V’
markers together with more explicit voltage information (e.g. 2.90V).
The animation characters show the DUT at bit or bytes resolution. In the left
example we have tested an x72 device, which requires nine animation
characters representing eight bytes of memory. Similarly, an x40 module will
require 5 byte-animation characters. The Basic Test in progress screen also
displays the HEX code of the current test pattern at the bottom of the screen.
The frequency list is
dependent on the
DUT and is subject to
change with
firmware
development.
RAMCHECK LX performs numerous timing tests at the start of the BASIC
test in order to determine the frequency of the DDR or SDRAM modules.
Once the frequency is determined, RAMCHECK LX will commence to test
the entire memory module at the selected frequency. If a problem is
encountered, RAMCHECK LX will automatically reduce the frequency (e.g.
800MHz, 667MHz, 533MHz, 466MHz, and 400MHz for DDR2 devices),
unless you have set up RAMCHECK LX to test at a fixed frequency by either
Setup or the Change-on-the-fly feature.
During the BASIC test, the screen will inform you of the voltage used to test
the module, and display a constant change of patterns used to test it. When a
group of patterns are used, only the first pattern is shown. The display shows
an indication of “UBF” if the module is detected as unbuffered, while
registered modules are identified with “REG”. There are two LEDs next to
the display on RAMCHECK. You will note that the MODULE POWER
LED indicator will glow when a module is being tested. When testing
DDR3/2/1 or SDRAM devices, you may see the Burst LED flashes as
memory patterns are bursted into the device.
Some devices utilize different wiring or addressing variations of the original
JEDEC standard. This variation is legitimate on specific motherboards, but
may result in failure in other motherboards that do not support this variation.
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