TL Electronic EmbeddedLine EL1092-H, User Manual

Page: 105 / 151

Chapter 5 BIOS Setup
Page: 5-33
BIOS Setting Options Description/Purpose
• Row Address (RAS) to Column
Address (CAS) Delay
(tRCD) - Once
we send the memory controller a row
address, we'll have to wait this many
cycles before accessing one of the
row's columns. So, if a row hasn't been
selected, this means we'll have to wait
tRCD + tCL cycles to get our result
from the RAM.
•
Row Precharge Time (tRP)
- If we
already have a row selected, we'll have
to wait this number of cycles before
selecting a different row. This means it
will take tRP + tRCD + tCL cycles to
access the data in a different row.
• Row Active Time (tRAS) - This is the
minimum number of cycles that a row
has to be active for to ensure we'll
have enough time to access the
information that's in it. This usually
needs to be greater than or equal to the
sum of the previous three latencies
(tRAS = tCL + tRCD + tRP).
Channel 0 Slot 0 No changeable options
Displays if Channel 0 Slot 0 is
populated/enabled or not.
Channel 0 Slot 1 No changeable options
Displays if Channel 0 Slot 1 is
populated/enabled or not.
Channel 1 Slot 0 No changeable options
Displays if Channel 1 Slot 0 is
populated/enabled or not.
Channel 1 Slot 1 No changeable options
Displays if Channel 1 Slot 1 is
populated/enabled or not.
Size No changeable options Displays the memory size.
Number of Ranks No changeable options Displays the Rank number.
Manufacturer No changeable options
Displays the name of the memory
manufacturer.