Teledyne LeCroy Kibra DDR - Manual (Page 164)

Teledyne LeCroy DDR3 and DDR4 JEDEC Timing Violations Summary
162 Kibra DDR Protocol Analyzer User Manual
5.1.10 V10 - t RFC REFRESH to a Valid Command
Defines the minimum interval between Refresh and the next valid command to the same
bank. The table outlines the minimum interval while the maximum (between two refresh
commands) is defined by 9 × Refresh Interval (tREFI).
5.1.11 V11 - tREFI REFRESH Interval
A Refresh command needs to be issued every tREFI interval and a maximum of 8 Refresh
commands can be postponed during SDRAM operation. Thus, in the event 8 Refresh
commands are postponed in a row, the maximum interval between two Refresh
commands would never exceed 9 × tREFI. After exiting Self‐Refresh Mode with one or
more Refresh commands postponed, additional Refresh commands may be postponed to
the extent that the total number of postponed Refresh commands (before and after the
Self‐Refresh) will never exceed eight. During Self‐Refresh Mode, the number of
postponed or pulled‐in REF commands does not change.
5.1.12 V12 - tRTR READ to READ delay (DDR3 - same rank) (DDR4 - same bank
group)
Defined as the interval between a single READ command and another l READ to the same
rank and the same DIMM. This is calculated based on the CAS to CAS delay (tCCD) which
is a minimum of 4 CKs for all speed bins.
5.1.13 V13 - tdrRTR READ to READ delay (different rank - same DIMM)
Defined as the interval between a single READ command and another READ to a different
rank within the same DIMM. Read bursts to a different rank are based on the CAS to CAS
delay (tCCD). Timing between commands to a different rank or DIMM should be vendor
specified.
5.1.14 V14 - tddRTR READ to READ delay (different DIMM)
Defined as the interval between a READ command and another READ to a different
DIMM. Timing between commands to a different rank or DIMM should be vendor
specified.
Speed
Grade 800 1066 1333 1600 1866
Min
(ns) 90 110 160 300 350
Speed
Grade Case Temp 800 1066 1333 1600 1866
Min (μs) 0 °C ≤ TCASE ≤ 85 ° 7.8 7.8 7.8 7.8 7.8
Min (μs) 85 °C < TCASE ≤ 95 °C 3.9 3.9 3.9 3.9 3.9