Teledyne Kibra DDR, User Manual, Page: 159 / 174

Kibra DDR Protocol Analyzer User Manual 157
DDR3 and DDR4 JEDEC Timing Violations Summary Teledyne LeCroy
5.1.6 V06 - tWTP WRITE to PRECHARGE delay
Defines the minimum interval between the point the Write Burst completes and the next
precharge command to the same bank. tWTP is calculated as the sum of Write Latency
(CWL + AL) + Write Recovery time (tWR) + [2 CKs (BC4) OR 4 CKs (BL8 or OTF)]. The write
recovery time (tWR) starts at the first rising clock edge after the last write data.
5.1.7 V07 - tRTPx READ to PRECHARGE delay
Defines the minimum external Read command to Precharge command spacing to the
same bank (equal to AL + tRTP). tRTP is internal Read Command to Precharge Command
Delay. (Note: minimum ACT to PRE timing, tRAS, must be satisfied as well) The minimum
value for the Internal Read Command to Precharge Command Delay is given by tRTP.MIN
= max (4 × nCK, 7.5 ns). For DDR3 systems with Additive Latency, tRTPx = AL + tRTP For
DDR4 systems, it would be AL + tRTP + PL.
5.1.8 V08 - tRP PRECHARGE to a Valid Command
The minimum interval between PreCharge and the next valid command is specified to
ensure the active row is closed before the next valid command.
5.1.9 V09 - tWRA WRA to a Valid Command
Defines the interval for Write Recovery + READ to PRECHARGE delay / Clock (average).
Write with Auto Precharge requires that the Controller take into account the CWL
(column write latency) which is the amount of delay required between the point the
Write command is issued until the data can actually be put on the bus. The data is sent in
a burst so the burst length must also be accounted for. Once the write data burst has been
received, the SDRAM will automatically precharge the row. The Controller must also take
into account the READ to PRECHARGE delay (tRP).
Speed
Grade
800D

(5 ‐ 5 ‐ 5)
800E

(6 ‐ 6 ‐ 6)
1066E
(6
‐ 6 ‐ 6)
1066F
(7
‐ 7 ‐ 7)
1066G
(8
‐ 8 ‐ 8)
1333F
(7
‐ 7 ‐ 7)
1333G
(8
‐ 8 ‐ 8)
1333H
(9
‐ 9 ‐ 9)
1600G
(8
‐ 8 ‐ 8)
Min
(ns)
12.5 15 11.25 13.125 15 10.5 12 13.5 10
Speed Grade 1600H
(9 ‐ 9 ‐ 9)
1600J
(10
‐ 10 ‐ 10)
1600K
(11
‐ 11 ‐ 11)
1866J
(10
‐ 10 ‐ 10)
1866k
(11
‐ 11 ‐ 11)
1866L
(12
‐ 12 ‐ 12)
1866M
(13
‐ 13 ‐ 13)
Min (ns) 11.25 12.5 13.75 10.7 11.7 12.84 13.91
Speed
Grade
All Speed BINs
Min (ns) WR + roundup (tRP / tCK(avg))