V06 - Twtp Write To Precharge Delay; V07 - Trtpx Read To Precharge Delay; V08 - Trp Precharge To A Valid Command; V09 - Twra Wra To A Valid Command - Teledyne Kibra DDR User Manual

DDR3 and DDR4 JEDEC Timing Violations Summary
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.
Speed 800D  800E 
Grade (5‐5‐5) (6‐6‐6)
Min 12.5 15
(ns)
Speed Grade 1600H
(9‐9‐9)
Min (ns) 11.25
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
Min (ns)
K ibra DDR Protocol Analyzer User Manual
1066E 1066F
(6‐6‐6) (7‐7‐7)
11.25 13.125
1600J 1600K
(10‐10‐10) (11‐11‐11)
12.5 13.75
All Speed BINs
WR + roundup (tRP / tCK(avg))
1066G 1333F
(8‐8‐8) (7‐7‐7)
15 10.5
1866J 1866k
(10‐10‐10) (11‐11‐11)
10.7 11.7
T eledyne LeCroy
1333G 1333H
(8‐8‐8) (9‐9‐9)
12 13.5
1866L 1866M
(12‐12‐12) (13‐13‐13)
12.84 13.91
1600G
(8‐8‐8)
10
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