EMIF
7.3.5.31 RDWR_LVL_RMP_CTRL Register (offset = D8h) [reset = 0h]
Read-Write Leveling Ramp Control Register
Read-Write Leveling Ramp Control Register is shown in
and described in
.
Figure 7-121. Read-Write Leveling Ramp Control Register
31
30
29
28
27
26
25
24
REG_RDWRLVL_EN
REG_RDWRLVLINC_RMP_PRE
R/W-
23
22
21
20
19
18
17
16
REG_RDLVLINC_RMP_INT
R/W-
15
14
13
12
11
10
9
8
REG_RDLVLGATEINC_RMP_INT
R/W-
7
6
5
4
3
2
1
0
REG_WRLVLINC_RMP_INT
LEGEND: R/W = Read/Write; R = Read only; W1toCl = Write 1 to clear bit; -n = value after reset
Table 7-141. Read-Write Leveling Ramp Control Register Field Descriptions
Bit
Field
Type
Reset
Description
31
REG_RDWRLVL_EN
R/W
Read-Write Leveling enable.
Set 1 to enable leveling.
Set 0 to disable leveling.
30-24
REG_RDWRLVLINC_RM
Incremental leveling pre-scalar in number of refresh periods during
P_PRE
ramp window.
The value programmed is minus one the required value.
Refresh period is defined by reg_refresh_rate in SDRAM Refresh
Control register.
23-16
REG_RDLVLINC_RMP_I
R/W
Incremental read data eye training interval during ramp window.
NT
Number of reg_rdwrlvlinc_rmp_pre intervals between incremental
read data eye training.
A value of 0 will disable incremental read data eye training during
ramp window.
15-8
REG_RDLVLGATEINC_R
R/W
Incremental read DQS gate training interval during ramp window.
MP_INT
Number of reg_rdwrlvlinc_rmp_pre intervals between incremental
read DQS gate training.
A value of 0 will disable incremental read DQS gate training during
ramp window.
7-0
REG_WRLVLINC_RMP_I
Incremental write leveling interval during ramp window.
NT
Number of reg_rdwrlvlinc_rmp_pre intervals between incremental
write leveling.
A value of 0 will disable incremental write leveling during ramp
window.
456
Memory Subsystem
SPRUH73H – October 2011 – Revised April 2013
Copyright © 2011–2013, Texas Instruments Incorporated