EP3C16F256I7 Altera, EP3C16F256I7 Datasheet - Page 230

• Manufacturer Part Number: EP3C16F256I7
• Description: Cyclone III
• Manufacturer: Altera

External Memory Interfaces in Cyclone III Devices
Figure 9–7. Cyclone III Dedicated Write DDIO
9–16
Cyclone III Device Handbook, Volume 1
-90˚ Shifted Clock
Output Enable
datain_h
datain_l
DDR Output Registers
A dedicated write DDIO block is implemented in the DDR output and
output enable paths.
write DDIO block is implemented in the IOE registers.
Output Register A
Output Register B
Output Enable
Register A
Output Enable
Register B
Register
Register
Register
Register
IOE
IOE
IOE
IOE
Figure 9–7
DDR Output Enable Registers
DDR Output Registers
OE
OE
O
O
shows how the Cyclone III dedicated
data0
data1
data1
data0
sel
Altera Corporation-Preliminary
DQ or DQS
March 2007