Altera ALTDLL - Manual (Page 29)

Chapter 3: Parameter Settings 3–11
ALTDQ_DQS Parameter Editor
© February 2012 Altera Corporation ALTDLL and ALTDQ_DQS Megafunctions User Guide
Table 3–6 describes options available on the DQ IN page. This page allows you to
configure the DQ input path. For more information about the DQ input path, refer to
“DQ Input Path” on page 4–8 .
DQS Output Path
Options
Enable DQS
output delay
chain1
— USE_DQS_OUTPUT_
DELAY_CHAIN1
Enables DQS_OUTPUT_DELAY_CHAIN1 (D5) in the
DQS output path. This parameter is used for deskew
purposes or SSN reduction.
D5 is a run-time adjustable delay chain.
DQS Output Path
Options
Enable DQS
output delay
chain2
— USE_DQS_OUTPUT_
DELAY_CHAIN2
Enables DQS_OUTPUT_DELAY_CHAIN2 (D6) in the
DQS output path. This parameter is used for deskew
purposes or SSN reduction.
D6 is a run-time adjustable delay chain.
DQS Output Path
Options
DQS output
register mode
Not used, FF,
or DDIO DQS_OUTPUT_REG_
MODE
Enables the DQS_OUTPUT_FF or
DQS_OUTPUT_DDIO_OUT output registers. Select FF
if you want flip-flop output registers or DDIO if you want
double data rate I/O registers.
DQS Output
Enable Options
Enable DQS
output enable
— USE_DQS_OE_PATH Instantiates DQS output enable path.
DQS Output
Enable Options
Enable DQS
output enable
delay chain1
— USE_DQS_OE_DELAY_
CHAIN1
Enables DQS_OUTPUT_DELAY_CHAIN1 (D5) in the
DQS OE path. This parameter is used for deskew
purposes or SSN reduction. D6 is a run-time adjustable
delay chain.
DQS Output
Enable Options
Enable DQS
output enable
delay chain2
— USE_DQS_OE_DELAY_
CHAIN2
Enables DQS_OUTPUT_DELAY_CHAIN2 (D6) in the
DQS OE path. This parameter is used for deskew
purposes or SSN reduction. D6 is a run-time adjustable
delay chain.
DQS Output
Enable Options
DQS output
enable register
mode
Not used, FF,
or DDIO DQS_OE_REG_MODE Enables the DQS_OUTPUT_FF or
DQS_OUTPUT_DDIO_OUT output registers. Select FF
if you want flip-flop registers or DDIO if you want double
data rate I/O registers.
Table 3–5. Options on DQS OUT/OE Page (Part 2 of 2)
Parameter Name Legal Value
Clear Box
Parameter Name Description