Altera ALTDLL User Manual
Page 109
A–8
Appendix A: Clear Box Generator
Clear Box Generator Options
ALTDLL and ALTDQ_DQS Megafunctions User Guide
© February 2012
Altera Corporation
DQS_CTRL_LATCHES_ENABLE
Optional
FALSE
FALSE, TRUE
This parameter describes whether the
delayctrlin[5..0]
and
offsetctrlin[5..0]
inputs are
latched or not. If set to
TRUE
, only a
DLL feeds the
delayctrlin[5..0]
input bus.
USE_DQS_ENABLE_CTRL_PHASE
_CTRLIN
Optional
TRUE
FALSE, TRUE
If set to
TRUE
, the phase setting is
determined by the
phasectrlin
input. If set to
FALSE
, the phase
setting is determined by the
DQS_ENABLE_CTRL_PHASE_
SETTING
Optional
0
0..7
This parameter determines the phase
shift implemented by the delay chain if
FALSE
;
otherwise, you can ignore this setting.
LEVEL_DQS_ENABLE
OptionalO FALSE
FALSE, TRUE
This is an optional field and defaults to
FALSE
.
DELAY_DQS_ENABLE_BY_HALF_
CYCLE
Optional
FALSE
FALSE, TRUE
This is an optional field and defaults to
FALSE
.
DQS_ENABLE_CTRL_ADD_PHASE
_TRANSFER_REG
Optional
FALSE
FALSE, TRUE,
DYNAMIC
If set to
TRUE
, a negative
edge-triggered register is added in data
path for the clock phase transfer. If set
to
FALSE
, no register is added. If it is
set to
DYNAMIC
, the
enaphasetransferreg
input
determines whether the register is
added or not. You can use the
negative-edge register to guarantee the
setup and hold time for a phase
transfer.
DQS_ENABLE_CTRL_INVERT_
PHASE
Optional
FALSE
FALSE, TRUE,
DYNAMIC
If set to
TRUE
, the phase output is
inverted. If set to
FALSE
, the phase
output is not inverted. If it is set to
DYNAMIC
, the
phaseinvertctrl
input determines whether the inverter
is used or not. Use the inverter to
increase the number of available
phases.
USE_IO_CLOCK_DIVIDER_
PHASECTRLIN
Optional
TRUE
FALSE, TRUE
If set to
TRUE
, the phase setting is
determined by the
phasectrlin
input. If set to
FALSE
, the phase
setting is determined by the
IO_CLOCK_DIVIDER_PHASE_
SETTING
Optional
0
0..7
This parameter determines the phase
shift implemented by the delay chain if
FALSE
;
otherwise, ignore this setting.
Table A–3. Megafunction Parameters to Configure DQS Input Path
(Part 3 of 4)
Parameter Name
Optional/
Required
Default
Legal Values
Description