Electrical, Power, and Thermal
Figure 4-3. tjit and tjitHP Timing Diagram
tCK/2
tjitHP
CLK/CLK
From AMB
tjit
tCK
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.
Figure 4-4. tCVA and tCVB Timing Diagram
CLK/CLK
FromAMB
tCVB
tCVA
CA From
AMB
Figure 4-5. tECVA and tECVB Timing Diagram
CLK/CLK
From AMB
tECVB
tECVA
CA From
AMB
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.
Intel® 6400/6402 Advanced Memory Buffer Datasheet
47
INTEL [ INTEL ]
