Hardware
/
litedram
mirror of https://github.com/enjoy-digital/litedram.git
1
0
Fork 0
Code Issues Packages Projects Releases Wiki Activity

init/lpddr4: modify pull-down drive strength to improve signal quality

This commit is contained in:
Jędrzej Boczar 2021-04-16 15:35:35 +02:00
parent 98f2f24e20
commit ebaf63479d
1 changed files with 2 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
litedram/init.py
View File

@ -456,6 +456,7 @@ def get_lpddr4_phy_init_sequence(phy_settings, timing_settings):
bl = 16 bl = 16
dq_odt = "RZQ/2" dq_odt = "RZQ/2"
ca_odt = "RZQ/2" ca_odt = "RZQ/2"
pull_down_drive_strength = "RZQ/3"
def get_nwr(): def get_nwr():
frequency_ranges = [ # Table 28. Frequency Ranges for RL, WL, nWR, and nRTP Settings frequency_ranges = [ # Table 28. Frequency Ranges for RL, WL, nWR, and nRTP Settings
@ -575,7 +576,7 @@ def get_lpddr4_phy_init_sequence(phy_settings, timing_settings):
(0, 1, 1), (0, 1, 1),
(1, 1, 0), (1, 1, 0),
(2, 1, 0), (2, 1, 0),
(3, 3, odt_map["RZQ/6"]), (3, 3, odt_map[pull_down_drive_strength]),
(6, 1, 0), (6, 1, 0),
(7, 1, 0), (7, 1, 0),
]) ])