6402 datasheet(47/250 Pages) INTEL

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Intel® 6400/6402 Advanced Memory Buffer Datasheet

Electrical, Power, and Thermal

4.4.6

tCVA, tCVB, tECVA and tECVB Parameter Description

The parameters tCVA and tCVB specify the time that command is valid after and before

CLK. tCVA stands for the time that the Command is Valid After the CLK/CLK crossing

point. tCVA is used for CA/CLK hold calculations (tIH). tCVB stands for the time that the

Command is Valid Before the CLK/CLK crossing point. tCVB is used for CA/CLK setup

calculations (tIS). Table 4-4 shows tCVA and tCVB.

tECVA and tECVB apply in early mode. For DIMMs with 36 devices, the command,

address and control signals can be shifted by 1/6 clock in early mode. Table 4-5 shows

tECVA and tECVB.

4.4.7

tDQSCK Timing Parameter Description

tDQSCK indicated the CLK to DQS delay. This value is used for tDQSS, tDSS and tDSH

timing calculations. In order to determine these numbers accurately, package

parameters must be taken into account. This adjusts the minimum time by -110 ps and

the maximum by -70 ps.

Figure 4-3. tjit and tjitHP Timing Diagram

FromAMB

tCK/2

tjitHP

tCK

tjit

CLK/CLK

Figure 4-4. tCVA and tCVB Timing Diagram

Figure 4-5. tECVA and tECVB Timing Diagram

FromAMB

CAFrom

AMB

tCVA

tCVB

CLK/CLK

From AMB

CA From

AMB

tECVA

tECVB

CLK/CLK

6402 Datasheet(PDF) 47 Page - Intel Corporation