Configures the tRFC timing parameter. This determines the delay applied after an AUTOREFRESH command before any other command is issued to the same rank.
The t_rfc_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 3-273 t_rfc_now register bit assignments
The following shows the bit assignments.
- [31:28] Reserved_1
- [27:20] t_rfc_cs_now
Configures the minimum delay between AUTOREFRESH operations to different ranks. The supported range for this bitfield is 0-255.
- [19:10] t_rfcfg_now
Configures the tRFC timing parameter for fine-grained AUTOREFRESH operations. The supported range for this bitfield is 2-700.
- [9:0] t_rfc_now
Configures the tRFC timing parameter for all-bank AUTOREFRESH operations. The supported range for this bitfield is 2-700.