DS823 Datasheet, PDF (26/33 Pages) Xilinx, Inc – DIP-4 and DIP-2 parity generation and verification

LogiCORE IP SPI-4.2 v12.2
.
Table 11: Source Static Configuration Parameter Definition
Name
Range
Description
NumDip2Errors[3:0]
1-15
Value equal to 0 gets set to 1.
Number of DIP-2 Errors. The Source Interface will
go out-of-frame (SrcOof asserted) and stop
transmitting SPI-4.2 data across the data bus after
receiving NumDip2Errors consecutive DIP-2 errors.
NumDip2Matches[3:0]
1-15
Value equal to 0 gets set to 1.
Number of DIP-2 Matches. The Source Interface
requires NumDip2Matches consecutive DIP-2
matches before going in-frame and beginning to
transfer SPI-4.2 data across the SPI-4.2 data bus.
SrcCalendarM[7:0]
0-255
(effective range 1–256)
Source Calendar Period. Sets the number of
repetitions of the calendar sequence before the DIP-
2 parity and framing words are received.
The Source core implements this parameter as a
static register programmed by the AXI4-Lite
interface, and it can be updated in circuit by first
deasserting SrcEn.
Note that the Source Calendar Period equals
SrcCalendar_M + 1. For example, if
SrcCalendar_M=22, the Source Calendar Period will
be equal to 23.
SrcCalendarLen[8:0]
0-511
(effective range 1–512)
Source Calendar Length. Sets the length of the
calendar sequence.
The Source core implements this parameter as a
static register programmed by the AXI4-Lite
interface, and it can be updated in circuit by first
deasserting SrcEn.
Note that the Source Calendar Length equals
SrcCalendar_Len + 1. For example, if
SrcCalendar_Len=15, the Source Calendar Length
will be equal to 16.
SrcAFThresNegate[8:0]
SrcAFThresAssert to 508
Values less than
SrcAFThresAssert get set to
SrcAFThresAssert.
Values greater than 508 get set
to 508.
Source Almost Full Threshold Negate. Specifies
the minimum number of empty FIFO locations to
exist in the Source FIFO before the
S_AXIS_SRCFF_TREADY is asserted.
SrcAFThresNegate is ≥ SrcAFThresAssert.
SrcAFThresAssert[8:0]
If SrcBurstMode = 0: 1-508.
If SrcBurstMode = 1 and
SrcBurstLen < 256, range is
SrcBurstLen-508.
If SrcBurstMode = 1 and
SrcBurstLen >=256, range is
256-508.
Source Almost Full Threshold Assert. Specifies
the minimum number of empty FIFO locations to
exist in the Source FIFO before
S_AXIS_SRCFF_TREADY is de-asserted.
SrcAFThresNegate ≥ SrcAFThresAssert.
DataMaxT[15:0]
0, 16–65535
Maximum Data-Training Interval. Maximum
interval between scheduling of training sequences
on the SPI-4.2 data path (in SPI-4.2 bus cycles).
Note that setting DataMaxT to zero configures the
core to never send periodic training.
AlphaData[7:0]
0-255
Data Training Pattern Repetitions. Number of
repetitions of the 20-word data training pattern. Note
that setting AlphaData to zero configures the core to
not periodically send training patterns. In this case,
the user can manually send training patterns by
asserting the TrainingRequest command.
26
www.xilinx.com
DS823 July 25, 2012
Product Specification