Dram Interface; Figure 13.13 Example Of Dram Connection (32-Bit Data Width, Area 3) - Hitachi SH7751 Hardware Manual

13.3.4

DRAM Interface

Direct Connection of DRAM: When the memory type bits (DRAMTP2–0) in BCR1 are set to
100, area 3 becomes DRAM interface. The DRAM interface function can then be used to connect
DRAM to the SH7751 Series.
16 or 32 bits can be selected as the interface data width.
2-CAS 16-bit DRAMs can be connected, since
Signals used for connection are
used when the data width is 16 bits.
In addition to normal read and write access modes, fast page mode is supported for burst access.
EDO mode, which enables the DRAM access time to be increased, is supported.
SH7751 Series
A10
A2
RD/
D31
D16
D15
D0

Figure 13.13 Example of DRAM Connection (32-Bit Data Width, Area 3)

Rev. 3.0, 04/02, page 378 of 1064
 
is used to control byte access.

    
, , to

 
, and RD/ .
 
to are not
256k × 16-bit
DRAM
A8
A0
I/O15
I/O0
A8
A0
I/O15
I/O0