Altera ALTDLL - Manual (Page 115)

A–14 Appendix A: Clear Box Generator
Clear Box Generator Options
ALTDLL and ALTDQ_DQS Megafunctions User Guide © February 2012 Altera Corporation
Table A–9 summarizes the Clear Box parameters for the ALTDQ_DQS megafunction
to configure the DQ OE path. The possible values for <IO> are BIDIR_DQ and
OUTPUT_DQ .
Table A–9. Megafunction Parameters to Configure DQ OE Path
Parameter Name
Optional/
Required Default
Legal
Values Description
USE_DQ_OE_DELAY_
CHAIN1
Optional FALSE FALSE,
TRUE Instantiates <IO> _OE_DELAY_CHAIN1 if
TRUE
USE_DQ_OE_DELAY_
CHAIN2
Optional FALSE FALSE,
TRUE Instantiates <IO> _OE_DELAY_CHAIN2 if
TRUE
DQ_OE_REG_MODE Optional NONE NONE, FF,
DDIO Instantiates <IO> _OE_FF if FF
Instantiates <IO> _OE_DDIO_OE if DDIO
DQ_OE_REG_POWER_UP Optional LOW LOW, HIGH This parameter describes the power-up
condition of all registers in the primitive.
DQ_OE_REG_ASYNC_MODE Optional NONE CLEAR,
PRESET,
NONE This parameter determines if the areset
port clears, presets, or has no effect on the
DDIO register(s). The
areset port is
required if this parameter is set to CLEAR or
PRESET .
DQ_OE_REG_SYNC_MODE Optional NONE CLEAR,
PRESET,
NONE This parameter determines if the sreset
port clears, presets, or has no effect on the
DDIO register(s). The
sreset port is
required if this parameter is set to CLEAR or
PRESET .