Figure 6-2: DQS Pins and DLLs in Cyclone V E (A2 and A4) Devices
DLL
Reference
Clock
Δt
Δt
Δt
Δt
DQS Logic
Blocks
DLL
Reference
Clock
DLL
to
IOE
to
IOE
to
IOE
to
IOE
DLL
DQS
Pin
DQS
Pin
DQS
Pin
DQS
Pin
DLL
Reference
Clock
Δt
Δt
Δt
Δt
DQS Logic
Blocks
DLL
Reference
Clock
DLL
to
IOE
to
IOE
to
IOE
to
IOE
DLL
DQS
Pin
DQS
Pin
DQS
Pin
DQS
Pin
Δt
Δt
Δt
Δt
DQS Logic
Blocks
to
IOE
to
IOE
to
IOE
to
IOE
DQS
Pin
DQS
Pin
DQS
Pin
DQS
Pin
Δt
Δt
Δt
Δt
DQS Logic
Blocks
to
IOE
to
IOE
to
IOE
to
IOE
DQS
Pin
DQS
Pin
DQS
Pin
DQS
Pin
External Memory Interfaces in Cyclone V Devices
Altera Corporation
CV-52006
DQS Phase-Shift Circuitry
6-14
2014.01.10