EMIF
7.3.6.1
DDR PHY Command 0/1/2 Address/Command Slave Ratio Register
(CMD0/1/2_REG_PHY_CTRL_SLAVE_RATIO_0)
The DDR PHY Command 0/1/2 Address/Command Slave Ratio Register
(CMD0/1/2_REG_PHY_CTRL_SLAVE_RATIO_0) is shown in the figure and table below.
Figure 7-129. DDR PHY Command 0/1/2 Address/Command Slave Ratio Register
(CMD0/1/2_REG_PHY_CTRL_SLAVE_RATIO_0)
31
16
Reserved
R-0
15
10
9
0
Reserved
CMD_SLAVE_RATIO
R-0
W-80h
LEGEND: R/W = Read/Write; R = Read only; -n = value after reset
Table 7-150. DDR PHY Command 0/1/2 Address/Command Slave Ratio Register
(CMD0/1/2_REG_PHY_CTRL_SLAVE_RATIO_0) Field Descriptions
Bit
Field
Value
Description
31-10
Reserved
Reserved
9-0
CMD_SLAVE_RATIO
0-80h
Ratio value for address/command launch timing in DDR PHY macro. This is the fraction of a
clock cycle represented by the shift to be applied to the read DQS in units of 256ths. In other
words, the full-cycle tap value from the master DLL will be scaled by this number over 256 to
get the delay value for the slave delay line.
7.3.6.2
DDR PHY Command 0/1/2 Address/Command DLL Lock Difference Register(
CMD0/1/2_REG_PHY_DLL_LOCK_DIFF_0)
The DDR PHY Command 0/1/2 Address/Command DLL Lock Difference Register
(CMD0/1/2_REG_PHY_DLL_LOCK_DIFF_0) is shown in the figure and table below.
Figure 7-130. DDR PHY Command 0/1/2 Address/Command DLL Lock Difference Register(
CMD0/1/2_REG_PHY_DLL_LOCK_DIFF_0)
31
16
Reserved
R-0
15
4
3
0
Reserved
DLL_LOCK_DIFF
R-0
W-4h
LEGEND: R/W = Read/Write; R = Read only; -n = value after reset
Table 7-151. DDR PHY Command 0/1/2 Address/Command DLL Lock Difference Register(
CMD0/1/2_REG_PHY_DLL_LOCK_DIFF_0) Field Descriptions
Bit
Field
Value
Description
31-4
Reserved
Reserved
3-0
DLL_LOCK_DIFF
0-4h
The max number of delay line taps variation allowed while maintaining the master DLL lock.This is
calculated as total jitter/ delay line tap size, where total jitter is half of (incoming clock jitter (pp) +
delay line jitter (pp)).
469
SPRUH73H – October 2011 – Revised April 2013
Memory Subsystem
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