IDELAYE3 Attributes

UltraScale Architecture SelectIO Resources User Guide (UG571)

Document ID
UG571
Release Date
2022-08-31
Revision
1.14 English

Table: IDELAYE3 Attributes lists the IDELAYE3 attributes.

Table 2-12:      IDELAYE3 Attributes

Attribute

Possible Values

Default

Type

Description

DELAY_SRC

DATAIN IDATAIN

IDATAIN

String

For more information, see DELAY_SRC Attribute.

CASCADE

NONE

MASTER

SLAVE_MIDDLE

SLAVE_END

NONE

String

For more information, see CASCADE Attribute.

DELAY_TYPE

FIXED VAR_LOAD VARIABLE

FIXED

String

The DELAY_TYPE attribute sets the type of delay used. It can be FIXED, VARIABLE or VAR_LOAD. See DELAY_TYPE Attribute for further information.

DELAY_VALUE

0–1250 (TIME UltraScale)

0–1100 (TIME UltraScale+)

0–511 (COUNT)

0

Decimal

TIME mode: Desired value in ps.

UltraScale devices support delays up to 1.25 ns.

UltraScale+ devices support up to 1.1 ns.

COUNT mode: Desired value in taps.

For more information, see DELAY_VALUE Attribute.

REFCLK_FREQUENCY

200.00–800.00
(UltraScale IDELAYCTRL)

300.00–800.00 (UltraScale+ IDELAYCTRL)

200.00–2400.00
(UltraScale BITSLICE_CONTROL)

300.00–2666.67 (UltraScale+ BITSLICE_CONTROL)

300.0

1 significant digit float

The REFCLK_FREQUENCY attribute specifies the reference clock of the IDELAYCTRL frequency in MHz. This attribute must mimic the clock frequency applied at the IDELAYCTRL component, except when DELAY_FORMAT is set to COUNT (when the attribute can be left at the default value).

DELAY_FORMAT

TIME (1)

COUNT

TIME

String

When set to TIME, the delay equals the value given in DELAY_VALUE (specified in ps) plus an Align_Delay. Calibrated using the REFCLK_FREQUENCY set here applied at the IDELAYCTRL component.

When set to COUNT, the initial tap setting goes to whatever number of taps is specified in DELAY_VALUE.

This does not give a constant delay because the tap delays vary with PVT.

For more information, see DELAY_FORMAT Attribute.

UPDATE_MODE

ASYNC

SYNC

MANUAL

ASYNC

String

For more information, see UPDATE_MODE Attribute.

SIM_DEVICE

ULTRASCALE, ULTRASCALE_PLUS, ULTRASCALE_PLUS_ES1, ULTRASCALE_PLUS_ES2

ULTRASCALE

String

Sets the device version (ULTRASCALE, ULTRASCALE_PLUS, ULTRASCALE_PLUS_ES1, ULTRASCALE_PLUS_ES2)

Notes:

1.When in TIME mode, calibration affects the availability of bit slices within the nibble. See Bank Overview for more information.