STLS2F02 Datasheet, PDF (24/49 Pages) STMicroelectronics – Loongson 2F high performance 64-bit superscalar MIPS® microprocessor

DDR2 SDRAM controller interface description
STLS2F02
4.4.2
Parameter descriptions
CONF_CTL_00 AP
The parameter determines whether the auto pre-charge function is enabled. If the function
is enabled, memory closes the page after each write/read instruction. If mass continuous
address operation happens, setting this parameter causes performance degradation.
CONF_CTL_00 CONCURRENTAP
This parameter determines whether the concurrent auto pre-charge function is enabled.
Most SDRAM vendors do not support this feature.
CONF_CTL_03 SREFRESH
This parameter sets the self refresh style. It must be set to 0 when returning from self
refresh.
CONF_CTL_07 CASLAT_LIN_GATE
This parameter controls the data sample of the memory controller when a read operation
returns. In general, It is equal to or less than half period of ACALAT_LIN. The value of
CASLAT_LIN is twice that of CAS.
CONF_CTL_15 DLL_INCREMENT
This parameter should not be set 0.
CONF_CTL_15 DLL_START_POINT
This parameter should not be set to 0 or 1 and should be less than 1.5 times the
DLL_LOCK_VALUE.
CONF_CTL_28 UB_DIMM
This parameter should be set to 1, when unbuffered DIMM(s) are used. It should be set 0
when SDRAM(s) are used.
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