Rainbow Electronics W90N740 - Manual (Page 51)

W90N740
Publication Release Date: November 26, 2004
- 47 - Revision A4
Configuration Registers（SDCONF0/1）
The configuration registers enable software to set a number of operating parameters for the SDRAM
controller. There are two configuration registers SDCONF0、SDCONF1 for SDRAM bank 0、bank 1
respectively. Each bank can have a different configuration.
Register Address R/W Description Reset Value
SDCONF0 0xFFF0.1008 R/W SDRAM bank 0 configuration register 0x0000.0800
SDCONF1 0xFFF0.100C R/W SDRAM bank 1 configuration register 0x0000.0800
31 30 29 28 27 26 25 24
BASADDR
23 22 21 20 19 18 17 16
BASADDR RESERVED
15 14 13 12 11 10 9 8
MRSET RESERVED AUTOPR LATENCY RESERVED
7 6 5 4 3 2 1 0
COMPBK DBWD COLUMN SIZE
BASADDR [31:19] ：Base address pointer of SDRAM bank 0/1
The start address is calculated as SDRAM bank 0/1 base pointer << 18. The SDRAM base address
pointer together with the “SIZE” bits constitutes the whole address range of each SDRAM bank.
MRSET [15] ：SDRAM Mode register set command for SDRAM bank 0/1
This bit set will issue a mode register set command to SDRAM.
AUTOPR [13] ：Auto pre-charge mode of SDRAM for SDRAM bank 0/1
Enable the auto pre-charge function of external SDRAM bank 0/1
0 = Auto pre-charge
1 = No auto pre-charge