W90N745CD Datasheet, PDF (73/422 Pages) Winbond – 16/32-bit ARM microcontroller

W90N745CD/W90N745CDG
Continued.
BITS
[10:8]
[7]
[6:5]
[4:3]
[2:0]
RESERVED
COMPBK
DBWD
COLUMN
SIZE
DESCRIPTION
-
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
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
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
Size of SDRAM bank 0/1
Indicates the memory size of external SDRAM bank 0/1
SIZE [2:0]
Size of SDRAM （Byte）
00 0
00 1
01 0
01 1
10 0
10 1
11 0
11 1
Bank disable
2M
4M
8M
16M
32M
64M
REVERSED
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