Xilinx 7 Series User Manual page 156

Chapter 4: Receiver
Table 4-20: RX Margin Analysis Attributes (Cont'd)
Attribute
ES_CONTROL
Binary
es_control_status
Binary
es_rdata
Binary
es_sdata
Binary
es_error_count
es_sample_count
RX_DATA_WIDTH Integer
156
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Type
6-bit [0]: RUN.
Asserting this bit causes a state transition from the WAIT state to the RESET state,
initiating a BER measurement sequence.
[1]: ARM
Asserting this bit causes a state transition from the WAIT state to the RESET state,
initiating a diagnostic sequence. In the ARMED state, deasserting this bit causes a state
transition to the READ state if one of the states of bits [5:2] below is not met.
[5:2]:
0001 In the ARMED state, causes a trigger event (transition to the READ state) when an
error is detected (i.e., an unmasked 1 on the Sdata bus).
0010 In the ARMED state, causes a trigger event (transition to the READ state) when the
qualifier pattern is detected in Rdata.
0100 In the ARMED state, causes a trigger event (transition to the READ state) when the
eye_scan_trigger port asserts High.
1000 In the ARMED state, causes a trigger event (transition to the READ state)
immediately.
4-bit [0]: DONE. Asserted High only in the WAIT, END, or READ states.
[3:1]: Current state of the state machine:
WAIT 000
RESET 001
COUN 011
END 010
ARMED 101
READ 100
80-bit When a trigger event occurs in the ARMED state, es_rdata[39:0] is the present state of the Rdata
bus and es_rdata[79:40] is the previous state of the Rdata bus.
80-bit When a trigger event occurs in the ARMED state, es_sdata[39:0] is the present state of the Sdata
bus and es_sdata[79:40] is the previous state of the Sdata bus.
16-bit In END and WAIT states, contains the final error count for the preceding BER measurement.
Hex
16-bit In END and WAIT states, contains the final sample count for the preceding BER measurement.
Hex
Sets the bit width of the RXDATA port. When 8B/10B encoding is enabled, RX_DATA_WIDTH
must be set to 20 or 40. Valid settings are 16, 20, 32, or 40.
See Interface Width Configuration, page 214
Width of valid data on Rdata and Sdata buses is the width of the internal datapath (16-bit or 20-bit).
For the different possible bus widths, the previous and current valid Rdata and Sdata bits
correspond to the following indices in ES_SDATA_MASK, ES_QUALIFIER,
ES_QUAL_MASK, es_rdata, and es_sdata:
valid Rdata and Sdata width
16
20
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7 Series FPGAs GTP Transceivers User Guide
UG482 (v1.9) December 19, 2016
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