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Table 3-2: ISERDESE2 Attributes (Cont'd)
Attribute Name
SRVAL_Q2
SRVAL_Q3
SRVAL_Q4
IOBDELAY
DATA_RATE Attribute
The DATA_RATE attribute defines whether the incoming data stream is processed as
single data rate (SDR) or double data rate (DDR). The allowed values for this attribute are
SDR and DDR. The default value is DDR.
DATA_WIDTH Attribute
The DATA_WIDTH attribute defines the parallel data output width of the serial-to-parallel
converter. The possible values for this attribute depend on the INTERFACE_TYPE and
DATA_RATE attributes. See
Table 3-3: Supported Data Widths
NETWORKING
MEMORY
MEMORY_DDR3
MEMORY_QDR
When the DATA_WIDTH is set to widths larger than eight, a pair of ISERDESE2 must be
configured into a master-slave configuration. See
expansion is not allowed in memory mode.
INTERFACE_TYPE Attribute
The INTERFACE_TYPE attribute determines whether the ISERDESE2 is configured in
memory or networking mode. The allowed values for this attribute are MEMORY,
MEMORY_DDR3, MEMORY_QDR, OVERSAMPLE, or NETWORKING. The default
mode is MEMORY.
Figure 3-5
7 Series FPGAs SelectIO Resources User Guide
UG471 (v1.10) May 8, 2018
Description
Sets the value after reset of the second
sample register.
Sets the value after reset of the third sample
register.
Sets the value after reset of the fourth sample
register.
Sets whether an input delay applies to
registered and/or non-registered outputs.
See
Using D and DDLY in the
INTERFACE_TYPE
illustrates the ISERDESE2 internal connections when in MEMORY mode.
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Input Serial-to-Parallel Logic Resources (ISERDESE2)
Binary: 0 or 1
Binary: 0 or 1
Binary: 0 or 1
NONE, IBUF, IFD, or BOTH
ISERDESE2.
Table 3-3
for supported data widths.
DATA_RATE
SDR
DDR
SDR
DDR
ISERDESE2 Width Expansion
Default
Value
Value
1
1
1
NONE
Supported Data Widths
2, 3, 4, 5, 6, 7, 8
4, 6, 8, 10, 14
None
4
. Width
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