HD6417615 Hitachi Semiconductor, HD6417615 Datasheet - Page 345

• Manufacturer Part Number: HD6417615
• Description: Hardware Manual
• Manufacturer: Hitachi Semiconductor

7.6.6
In addition to the kind of DRAM in which data is output to the data bus only while the CASn
signal is asserted in a data read cycle, there is another kind provided with an EDO mode in which,
while both RAS and OE are asserted, once the CASn signal is asserted data is output to the data
bus until CASn is next asserted, even though CASn is negated during this time.
328
Note: * DACKn waveform when active-low is specified
Read
Write
EDO Mode
CKIO
A24–A16
A15–A1
RAS
CASn
RD/WR
RD
D31–D0
RD/WR
RD
D31–D0
DACKn *
Figure 7.42 RAS Down Mode Different Row Access Timing
Tp
Tr
Tc1
Tc2