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Chapter 16: Transceiver Reconfiguration Controller IP Core 16–17
DFE Registers
November 2012 Altera Corporation Altera Transceiver PHY IP Core
User Guide
1 If you are using the EyeQ monitor with DFE enabled, you must put the EyeQ monitor
in 1D mode by writing the EyeQ 1D-eye bit. For more information, refer to EyeQ
Offsets and Values.
Table 16–14 lists the direct DFE registers that you can access using Avalon-MM reads
and writes on reconfiguration management interface.
1 All undefined register bits are reserved.
Table 16–15 describes the DFE registers that you can access to change DFE settings.
1 All undefined register bits are reserved and must be set to 0.
Table 16–14. DFE Registers
Recon
-fig
Addr
Bits R/W Register Name Description
7’h18 [9:0] RW
logical channel address
The logical channel address. Must be specified when
performing dynamic updates. The Transceiver
Reconfiguration Controller maps the logical address to the
physical address.
7’h11 [9:0] RW
physical channel number
The physical channel address. The Transceiver
Reconfiguration Controller maps the logical address to the
physical address.
7’h1A
[9] R
control and status
Error
. When asserted, indicates an invalid channel or
address.
[8] R
Busy
. When asserted, indicates that a reconfiguration
operation is in progress.
[1] W
Read
. Writing a 1 to this bit triggers a read operation.
[0] W
Write
. Writing a 1 to this bit triggers a write operation.
7’h1B [5:0] RW
dfe_offset
Specifies the 6-bit offset of the DFE register.
7’h1C [15:0] RW
data
Reconfiguration data for the transceiver PHY registers.
Table 16–15. DFE Offset and Values (Part 1 of 2)
Offset Bits R/W Register Name Description
0x0
[1] RW
power on
Writing a 0 to this bit powers down DFE in the channel
specified.
[0] RW
adaptation engine
enable
Writing a 1 triggers the adaptive equalization engine.
0x1 [3:0] RW
tap 1
Specifies the coefficient for the first post tap. The valid
range is 0–15.
0x2
[3] RW
tap 2 polarity
Specifies the polarity of the second post tap as follows:
0: negative polarity
1: positive polarity
[2:0] RW
tap 2
Specifies the coefficient for the second post tap. The valid
range is 0–7.
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