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How to set address multiplex connecting with 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 address multiplex bit (AMX[3:0]) of SH7709S/SH7729R/SH7706/SH7727 as follows.

 

Specification of SDRAM
Address multiplex
setting value
(AMX)
Remarks
Capacitance
Configuration
64Mbit 524,288 words x 32 bits x4 banks
Specified with low address A0~A10
Specified with column address A0~A7
Specifying A10-pin precharge mode
AMX[3:0]=B'0111   
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
AMX[3:0]=B'0100   
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
AMX[3:0]=B'0101 - Column address 8-bit product
cannot be used
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
AMX[3:0]=B'1101 - Connectable by the same method as 256Mbit product (x16)x2pcs
- Column address 10-bit product
cannot be used
Suitable Products
SH7729R
SH7727
SH7709S
SH7706