Samsung S3C2451X User Manual page 136

MOBILE DRAM CONTROLLER
8. Issue a PALL(pre-charge all) command.
Program the INIT[1:0] to '01b'. This automatically issues a PALL(pre-charge all) cammand to the DRAM.
9. Issue 2 or more auto-refresh commands.
10. Issue a MRS command with LOW to A8 to initialize device operation.
Program the INIT[1:0] to '10b'. & BANKCON3[8]='0b'
11. Wait 200 clock after step 7, execute OCD Calibration.
12. The external DRAM is now ready for normal operation
Preliminary product information describe products that are in development,
for which full characterization data and associated errata are not yet available.
6-4
Specifications and information herein are subject to change without notice.
S3C2451X RISC MICROPROCESSOR