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 |