IEI Integration NANO-9452 v1.12 - Manual (Page 158)

NANO-9452 EPIC Motherboard
Page 140
DRAM RAS# to CAS# Delay [5 DRAM Clocks]
Use the DRAM RAS# to CAS# Delay option to specify the number of clock cycles must
elapse between sending a RAS (row address strobe) signal and the CAS (column address
strobe) signal. A pause is required between the RAS signal and the CAS signal to ensure
the memory is correctly addressed. (To be able to change this configuration option the
Configure DRAM Timing by SPD configuration option must be set to “Disabled”)
Configuration options are listed below:
2 DRAM Clocks
3 DRAM Clocks
4 DRAM Clocks
5 DRAM Clocks D EFAULT
DRAM RAS# Precharge [3 DRAM Clocks]
Use the DRAM RAS# Precharge option to set the speed at which the RAM terminates the
access of one row and start accessing another. (To be able to change this configuration
option the DRAM RAS# Precharge configuration option must be set to “Manual”) The
following configuration options are available
2 DRAM Clocks
3 DRAM Clocks
4 DRAM Clocks
5 DRAM Clocks
DRAM RAS# Activate to Precharge [15 DRAM Clocks]
Use the DRAM RAS# Activate to Precharge option to specify the length of the delay
between the activation and precharge commands for the RAS signal. That is how long
after activation can the access cycle be started again. This influences row activation time
that is considered when memory has hit the last column in a specific row, or when an
entirely different memory location is requested. (To be able to change this configuration
option the Configure DRAM Timing by SPD configuration option must be set to
“Disabled”) The following configuration options are available:
4 DRAM Clocks
5 DRAM Clocks