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16–22 Chapter 16: Transceiver Reconfiguration Controller IP Core
ATX PLL Calibration Registers
Altera Transceiver PHY IP Core November 2012 Altera Corporation
User Guide
Table 16–17 describes the AEQ registers that you can access to change AEQ settings.
1 All undefined register bits are reserved and must be set to 0.
Refer to Changing Transceiver Settings Using Register-Based Reconfiguration for the
procedures you can use to control AEQ.
ATX PLL Calibration Registers
This feature allows you to rerun ATX calibration after power up. The Transceiver
Reconfiguration Controller automatically runs ATX calibration at power up.
1 You may need to rerun ATX calibration if you reset an ATX PLL and it does not lock
after the specified lock time.
Table 16–18 lists the direct access ATX registers that you can access using Avalon-MM
reads and writes on reconfiguration management interface.
Table 16–17. AEQ Offsets and Values
Offset Bits R/W Register Name Description
Default
Value
0x0
[8] R
adapt_done
When asserted, indicates that adaptation has
completed. In One-Time Adaptation Mode, AEQ
stops searching new EQ settings even if the signal
quality of incoming serial data is inadequate. In
Continuous Adaptation Mode, AEQ continues to
search for new settings after this bit is asserted.
This bit is only valid in one-time AEQ adaptation
mode. For some extreme cases, when the channel
loss is too much for AEQ to compensate, the
adapt_done
signal may never be asserted. The
AEQ engine can take up to 50,000 reconfiguration
clock cycles before selecting the final equalization
settings.
1b’0
[1:0] RW
mode
Specifies the following address modes:
2’b00: Low power manual equalization mode
2’b01: One-time AEQ adaptation at power up
2’b10: Perform continuous AEQ adaptation
2’b11: Reserved
2’b00
0x1 [3:0] R
equalization
results
This is the value set by the automatic AEQ
adaptation performed at startup. If you choose to
perform manual equalization using the linear
equalizer, you can use this value as a reference.
Although automatic and manual equalization do not
provide identical functionality, specifying this value
enables manual equalization to approximate the
original setting.
4’b0000
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