Rainbow Electronics W90N740 - Manual (Page 53)

W90N740
Publication Release Date: November 26, 2004
- 49 - Revision A4
SIZE [2:0] ：Size of SDRAM bank 0/1
Indicates the memory size of external SDRAM bank 0/1
SIZE [2:0] Size of SDRAM （Byte）
0 0 0 Bank disable
0 0 1 2M
0 1 0 4M
0 1 1 8M
1 0 0 16M
1 0 1 32M
1 1 0 64M
1 1 1 REVERSED
Timing Control Registers （SDTIME0/1）
W90N740 offers the flexible timing control registers to control the generation and processing of the
control signals and can achieve you use different speed of SDRAM
Register Address R/W Description Reset Value
SDTIME0 0xFFF0.1010 R/W SDRAM bank 0 timing control register 0x0000.0000
SDTIME1 0xFFF0.1014 R/W SDRAM bank 1 timing control register 0x0000.0000
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 tRCD
7 6 5 4 3 2 1 0
tRDL tRP tRAS