Nuvoton NUC970 series, Technical Reference Manual, Page: 235 / 1251

NUC970 Technical Reference Manual
Publication Release Date: Dec. 15, 2015
- 235 - Revision V1.30
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SDRAM Extended Mode Register (SDIC_EMR)
The SDRAM Extended Mode Register is used to configure SDRAM Extend Mode Register. This
Extended Mode Register value will be applied to both SDRAM 0 and SDRAM 1 devices.
Write this register, the SDRAM controller will generate a Load Mode Register (LMR) command to the
SDRAM. This Extended Mode Register is only used for DDR and DDR2 SDRAM.
Register Offset R/W Description Reset Value
SDIC_EMR S 0x01C R/W SDRAM Extended Mode Register 0x0000_4000
31 30 29 28 27 26 25 24
Reserved
23 22 21 20 19 18 17 16
Reserved
15 14 13 12 11 10 9 8
Reserved Configure
7 6 5 4 3 2 1 0
Configure DrvStrength DLLEN
Bits Description
[31:14]
Reserved
Reserved.
[13:2]
Configure
SDRAM Dependent Configuration
The value of this field is SDRAM type dependent. The definition of bits in this field is different
between DDR SDRAM and DDR2 SDRAM. Please refer the SDRAM initial sequence and
related SDRAM specification to know what value should be configured in this field.
[1] DrvStrength
Output Drive Strength
This bit sets the SDRAM output drive strength.
0 = Normal drive strength.
1 = Reduced drive strength.
[0] DLLEN
DLL Enable
This bit is to enable or disable the DLL of SDRAM device.
0 = Enable DLL of SDRAM device.
1 = Disable DLL of SDRAM device.