Altera ALTDLL - Manual (Page 34)

3–16 Chapter 3: Parameter Settings
ALTDQ_DQS Parameter Editor
ALTDLL and ALTDQ_DQS Megafunctions User Guide © February 2012 Altera Corporation
Table 3–9 on page 3–16 describes the options available on the OCT Path page. This
page allows you to configure the DQ and DQS OCT paths. For more information
about the DQ and DQS OCT paths, refer to
“DQ/DQS OCT Path” on page 4–14 .
Create
‘io_clock_divider
_slaveout’ output
port — USE_IO_CLOCK_
DIVIDER_SLAVEOUT
Enables the output of the divider’s D flip-flop (DFF). The
output signal can only be connected to the
masterin
input of another I/O clock divider block and it cannot
have more than one fan-out. Turn on this parameter
when you chain the I/O clock divider blocks from
multiple ALTDQ_DQS instances.
IO Clock Divider
Invert Phase Always,
Never, or
Based on
register
configuration IO_CLOCK_DIVIDER_
INVERT_PHASE
If you turn on Always, the phase output is inverted. If
you turn on Never, the phase output is not inverted. If
you turn on Based on register configuration, the
phaseinvertctrl input determines whether or not
the inverter is used. The inverter can be used to increase
the number of available phases.
Table 3–8. Options on Half-Rate Page (Part 2 of 2)
Parameter Name Legal Value
Clear Box
Parameter Name Description
Table 3–9. Options on OCT Path Page
Parameter Name Legal Value
Clear Box
Parameter Name Description
Dynamic
Termination
Control Options
Enable Dynamic
Delay-chain1
— USE_OCT_DELAY_
CHAIN1
Enables _OCT_DELAY_CHAIN1 (D5) on both the
DQ and DQS dynamic OCT paths. The external memory
interfaces synchronize the timing of the turning on and
off of the parallel termination during reads and writes
from both the DQ and DQS pins, and to improve overall
timing margins.
D5 is a run-time adjustable delay chain.
For more information about configuring delay chains
dynamically, refer to
“Delay Chains” on page 4–15 .
Dynamic
Termination
Control Options
Enable Dynamic
Delay-chain2
— USE_OCT_DELAY_
CHAIN2
Enables _OCT_DELAY_CHAIN2 (D6) on both the
DQ and DQS dynamic OCT paths. The external memory
interfaces synchronize the timing of turning on and off of
the parallel termination during reads and writes from
both the DQ and DQS pins, and to improve overall timing
margins.
D6 is a run-time adjustable delay chain.
For more information about configuring delay chains
dynamically, refer to
“Delay Chains” on page 4–15 .
OCT register
mode Not used, FF,
or DDIO OCT_REG_MODE Enables the full-rate dynamic OCT registers
(
_OCT_FF or _OCT_DDIO registers) on
both the DQ and DQS dynamic OCT paths. Select FF if
you want flip-flop registers or DDIO if you want double
data rate I/O registers.
For more component information about this block, refer
to the “Dynamic On-Chip Termination Control” section in
the External Memory Interface chapter of the respective
device handbooks.