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Merge pull request #74 from softerhardware/master 

Update to MT40A1G8 that Phillip was successful with
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enjoy-digital 2019-02-09 07:10:15 +01:00 committed by GitHub
parent f2074542a1 d65377fa1f
commit 0b49cbbc84
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1 changed files with 12 additions and 3 deletions
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litedram/modules.py
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@ -373,6 +373,15 @@ class EDY4016A(SDRAMModule):
class MT40A1G8(SDRAMModule):
# param | prodesign | this
# tFAW | 30n | 20, 21, 25
# tRAS | 32n | 32
# tRCD | 13.32n | 13.32, 13.5
# tREFI | 7.8u | 7.825u
# tRFC | 350 | 350
# tRP | 13.32n | 13.32, 13.5
# tRRD | 3.3, 6.4 | 4, 4.9
# tWTR | 2.5, 7.5 | 4, 7.5
memtype = "DDR4"
# geometry
ngroupbanks = 4
@ -381,12 +390,12 @@ class MT40A1G8(SDRAMModule):
nrows = 65536
ncols = 1024
# timings
technology_timings = _TechnologyTimings(tREFI=64e6/8192, tWTR=(4, 7.5), tCCD=(4, None), tRRD=(4, 4.9))
technology_timings = _TechnologyTimings(tREFI=64e6/8192, tWTR=(2.5, 7.5), tCCD=(4, None), tRRD=(3.3, 6.4))
speedgrade_timings = {
"1333": _SpeedgradeTimings(tRP=15, tRCD=15, tWR=15, tRFC=219, tFAW=(20, 25), tRAS=32),
"2400": _SpeedgradeTimings(tRP=13.32, tRCD=13.32, tWR=15, tRFC=350, tFAW=(20, 25), tRAS=32),
"2666": _SpeedgradeTimings(tRP=13.50, tRCD=13.50, tWR=15, tRFC=350, tFAW=(20, 21), tRAS=32),
}
speedgrade_timings["default"] = speedgrade_timings["1333"]
speedgrade_timings["default"] = speedgrade_timings["2400"]
class MT40A512M16(SDRAMModule):