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Bus Controller (BC)
8-64
■ 2 WE control/2 CAS control
DRAM that permits byte/word control can be supported by selecting either one of the following two methods:
• 2 WE control: The two pins WE1 and WE0 are used for byte/word control.
• 2 CAS control: The two pins DCAS1 and DCAS0 are used for byte/word control.
Fig. 8-14-3 illustrates an example of a write using 2 WE control, and Fig. 8-14-4 illustrates an example of a write
using 2 CAS control.
Fig. 8-14-3 Example of an 8-bit Data Write Using 2 WE Control (16-bit Bus Width)
Fig. 8-14-4 Example of an 8-bit Data Write Using 2 CAS Control (16-bit Bus Width)
MCLK
An
Dn
CAS
RASn
WE1
WE0
Row Column ColumnRow
MCLK
An
Dn
DCAS1
RASn
DWE
DCAS0
Row Column Row Column