3.3.302 rdlvl_control_now

Determines the DMC behavior during read training operations. See the PHY training interface section of the Integration Manual for more details on PHY training.

The rdlvl_control_now register characteristics are:
Usage constraints
Can be read from when in ALL states. Cannot be written to and only updated when in CONFIG, LOW-POWER or PAUSED states.
There is only one DMC configuration.
The following figure shows the bit assignments.
Figure 3-302 rdlvl_control_now register bit assignments
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The following shows the bit assignments.
[31:25] Reserved_7
Unused bits
[24] rdlvl_preamble_now
For DDR4 program to enable or disable issue of preamble training mode MRS prior to performing read leveling training.
[23:20] Reserved_6
Unused bits
[19:16] rdlvl_pattern_now
Program the value to be driven onto dfi_lvl_pattern during training. The DMC ignores the value. For default DFI encodings see the DFI specification [5].
[15] Reserved_5
Unused bits
[14] rdlvl_err_en_now
If enabled replay commands because of dfi_err during training.
[13] refresh_dur_rdlvl_now
Program to enable AUTOREFRESH commands to be generated during training operations. When enabled (1'b1), the DMC exits a training sequence to perform refresh.
[12] rdlvl_refresh_now
Program to enable or disable issue of an AUTOREFRESH command prior to performing read leveling training.
[11] Reserved_4
Unused bits
[10:9] rdlvl_command_ba1_0_now
Program the BA address to use for training commands.
[8] Reserved_3
Unused bits
[7:5] Reserved_2
Unused bits
[4] rdlvl_setup_now
Program the command that sets up the DRAM for read leveling training.
[3:1] Reserved_1
Unused bits
[0] rdlvl_mode_now
Program the mode used for read leveling training.
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