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How to set address multiplex when connecting 32-bit bus width SDRAM?

Latest Updated:03/24/2009

Question:

How should be set address multiplex when connecting it with 32-bit bus width SDRAM?

Answer:

When connecting it with 32-bit bus width SDRAM, please set for the row address bit (a2/3ROW[1:0]) and column address bit(A2/3COL[1:0]) of SH7705/SH7720 as follows.

 

Specification of SDRAM
Address multiplex
setting value
(AMX)
Remarks
Capacitance
Configuration
64Mbit 524,288 words x 32 bits x 4 banks
Specified with low address A0~A10
Specified with column address A0~A7
Specifying A10-pin precharge mode
A2/3ROW[1:0]=B'00
A2/3COL[1:0]=B'00
 
128Mbit 1,048,576 words x 32 bits x 4 banks
Specified with low address A0~A11
Specified with column address A0~A7
Specifying A10-pin precharge mode
A2/3ROW[1:0]=B'01
A2/3COL[1:0]=B'00
 
256Mbit 2,097,152 words x 32 bits x 4 banks
Specified with low address A0~A11
Specified with column address A0~A8
Specifying A10-pin precharge mode
A2/3ROW[1:0]=B'01
A2/3COL[1:0]=B'01
 
512Mbit 4,194,304 words x 32 bits x 4 banks
Specified with low address A0~A12
Specified with column address A0~A8
Specifying A10-pin precharge mode
A2/3ROW[1:0]=B'10
A2/3COL[1:0]=B'01
 
512Mbit 4,194,304 words x 32 bits x 4 banks
Specified with low address A0~A11
Specified with column address A0~A9
Specifying A10-pin precharge mode
A2/3ROW[1:0]=B'01
A2/3COL[1:0]=B'10
 
Suitable Products
SH7720
SH7705