NT5CB128M8GP-EKB datasheet(56/160 Pages) NANYA

56 / 160 page

Version 2.2

Nanya Technology Cooperation ©

04/2019

NTC Proprietary

Level: Property

DDR3(L) 1Gb SDRAM

NT5CB(C)128M8GN / NT5CB(C)64M16GP

Write Operation

DDR3(L) Burst Operation

During a READ or WRITE command, DDR3(L) will support BC4 and BL8 on the fly using address A12 during the READ or

WRITE (Auto Precharge can be enabled or disabled).

A12=0, BC4 (BC4 = Burst Chop, tCCD=4)

A12=1, BL8

A12 is used only for burst length control, not as a column address.

WRITE Timing Violations

Motivation

Generally, if timing parameters are violated, a complete reset/initialization procedure has to be initiated to make sure the

DRAM works properly. However, it is desirable for certain minor violations that the DRAM is guaranteed not to “hang up”

and errors be limited to that particular operation.

For the following, it will be assumed that there are no timing violations with regard to the Write command itself (including

ODT, etc.) and that it does satisfy all timing requirements not mentioned below.

Data Setup and Hold Violations

Should the data to strobe timing requirements (tDS, tDH) be violated, for any of the strobe edges associated with a write

burst, then wrong data might be written to the memory location addressed with the offending WRITE command.

Subsequent reads from that location might result in unpredictable read data, however, the DRAM will work properly

otherwise.

Strobe to Strobe and Strobe to Clock Violations

Should the strobe timing requirements (tDQSH, tDQSL, tWPRE, tWPST) or the strobe to clock timing requirements (tDSS,

tDSH, tDQSS) be violated, for any of the strobe edges associated with a Write burst, then wrong data might be written to

the memory location addressed with the offending WRITE command. Subsequent reads from that location might result in

unpredictable read data, however the DRAM will work properly otherwise.

Write Timing Parameters

This drawing is for example only to enumerate the strobe edges that “belong” to a write burst. No actual timing violations

are shown here. For a valid burst all timing parameters for each edge of a burst need to be satisfied (not only for one edge -

as shown).

NT5CB128M8GP-EKB Datasheet(PDF) 56 Page - Nanya Technology Corporation.