EMIF
7.3.5.9
SDRAM_TIM_2 Register (offset = 20h) [reset = 0h]
SDRAM_TIM_2 is shown in
and described in
Figure 7-99. SDRAM_TIM_2 Register
31
30
29
28
27
26
25
24
Reserved
reg_t_xp
reg_t_odt
reg_t_xsnr
R-0h
R/W-0h
R/W-0h
R/W-0h
23
22
21
20
19
18
17
16
reg_t_xsnr
R/W-0h
15
14
13
12
11
10
9
8
reg_t_xsrd
R/W-0h
7
6
5
4
3
2
1
0
reg_t_xsrd
reg_t_rtp
reg_t_cke
R/W-0h
R/W-0h
R/W-0h
LEGEND: R/W = Read/Write; R = Read only; W1toCl = Write 1 to clear bit; -n = value after reset
Table 7-119. SDRAM_TIM_2 Register Field Descriptions
Bit
Field
Type
Reset
Description
31
Reserved
R
0h
30-28
reg_t_xp
R/W
0h
Minimum number of DDR clock cycles from Powerdown exit to any
command other than a Read command, minus one.
For DDR2 and LPDDR1, this field must satisfy greater of tXP or
tCKE.
27-25
reg_t_odt
R/W
0h
Minimum number of DDR clock cycles from ODT enable to write
data driven for DDR2 and DDR3.
reg_t_odt must be equal to tAOND.
24-16
reg_t_xsnr
R/W
0h
Minimum number of DDR clock cycles from Self-Refresh exit to any
command other than a Read command, minus one.
15-6
reg_t_xsrd
R/W
0h
Minimum number of DDR clock cycles from Self-Refresh exit to a
Read command, minus one.
5-3
reg_t_rtp
R/W
0h
Minimum number of DDR clock cycles from the last Read command
to a Pre-charge command for DDR2 and DDR3, minus one.
2-0
reg_t_cke
R/W
0h
Minimum number of DDR clock cycles between pad_cke_o changes,
minus one.
433
SPRUH73H – October 2011 – Revised April 2013
Memory Subsystem
Copyright © 2011–2013, Texas Instruments Incorporated