W90N740CD WINBOND [Winbond], W90N740CD Datasheet - Page 49

• Manufacturer Part Number: W90N740CD
• Description: 32-Bit ARM7TDMI-Based Micro-Controller
• Manufacturer: WINBOND [Winbond]

DBWD [6:5] ：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.
COLUMN [4:3] ：Number of column address bits in SDRAM bank 0/1
Indicates the number of column address bits in external SDRAM bank 0/1.
SIZE [2:0] ：Size of SDRAM bank 0/1
Indicates the memory size of external SDRAM bank 0/1
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
SDTIME0
SDTIME1
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
SIZE [2:0]
COLUMN [4:3]
DBWD [6:5]
0xFFF0.1014
0xFFF0.1010
ADDRESS
0
0
1
1
0
0
1
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
R/W SDRAM bank 0 timing control register
R/W SDRAM bank 1 timing control register
R/W
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W90N740CD/W90N740CDG
DESCRIPTION
Size of SDRAM （Byte）
16-bit (half-word)
Bank disable
REVERSED
Bank disable
32-bit (word)
REVERSED
8-bit (byte)
16M
32M
64M
2M
4M
8M
BITS
BITS
10
8
9
RESET VALUE
0x0000.0000
0x0000.0000