Rainbow Electronics W90N745CDG User Manual
Page 73
W90N745CD/W90N745CDG
- 68 -
Continued.
BITS
DESCRIPTION
[10:8] RESERVED
-
[7] COMPBK
Number of component bank in SDRAM bank 0/1
Indicates the number of component bank (2 or 4 banks) in external
SDRAM bank 0/1.
0 = 2 banks
1 = 4 banks
[6:5] DBWD
Data bus width for SDRAM bank 0/1
Indicates the external data bus width connect with SDRAM bank 0/1
If DBWD = 00, the assigned SDRAM access signal is not generated
i.e. disable.
DBWD [6:5]
Bits
0 0
Bank
disable
0 1
8-bit
(byte)
1 0 16-bit
(half-word)
1 1
REVERSED
[4:3]
COLUMN
Number of column address bits in SDRAM bank 0/1
Indicates the number of column address bits in external SDRAM
bank 0/1.
COLUMN [4:3]
Bits
0 0
8
0 1
9
1 0
10
1 1
REVERSED
[2:0] SIZE
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