Altera External Memory PHY Interface - Manual (Page 28)

3–12 Chapter 3: Functional Description—ALTMEMPHY (nonAFI)
ALTMEMPHY Signals
External Memory PHY Interface (ALTMEMPHY) (nonAFI) Megafunction User Guide © January 2010 Altera Corporation
The ports listed in Table 3–5 only exist when you target Stratix III and Stratix IV
devices. You can leave them unconnected if you are not using user-mode calibrated
OCT. For more information about Stratix III and Stratix IV ports, refer to
ALTMEMPHY Signals section in chapter 5 of the
DDR and DDR2 SDRAM
High-Performance Controllers and ALTMEMPHY IP User Guide .
Table 3–4. External DLL Signals for DDR2 and DDR SDRAM—nonAFI
Signal Name Type Width Description
dqs_delay_ctrl_
export
output 6 Allows sharing DLL in this ALTMEMPHY instance with another
ALTMEMPHY instance. Connect the
dqs_delay_ctrl_export
port on the ALTMEMPHY
instance with a DLL to the dqs_delay_ctrl_import port
on the other ALTMEMPHY instance.
dqs_delay_ctrl_
import
input 6 Allows the use of DLL in another ALTMEMPHY instance in this
ALTMEMPHY instance. Connect the
dqs_delay_ctrl_export
port on the ALTMEMPHY
instance with a DLL to the dqs_delay_ctrl_import port
on the other ALTMEMPHY instance.
dll_reference_
clk
output 1 Reference clock to feed to an externally instantiated DLL. This
clock is typically from one of the PHY PLL outputs.
Table 3–5. User-Mode Calibrated OCT Control Signals for DDR2/DDR SDRAM—nonAFI (Note 1) , (2)
Signal Name Type Width Description
oct_ctl_rs_value input 14 Specifies serial termination value. Connects to the
seriesterminationcontrol
bus of the ALT_OCT
megafunction. This port exists when you target Stratix IV and
Stratix III devices only.
oct_ctl_rt_value input 14 Specifies parallel termination value. Connects to the
parallelterminationcontrol
bus of the ALT_OCT
megafunction. This port exists when you target Stratix IV and
Stratix III devices only.
Notes to Table 3–5 :
(1) These ports are available if you want to use user-mode OCT calibration. Otherwise, they can be left unconnected.
(2) For more information on OCT, see the ALT_OCT Megafunction User Guide.