Visible to Intel only — GUID: etn1690290092788
Ixiasoft
Visible to Intel only — GUID: etn1690290092788
Ixiasoft
2.4.1.3.3. Differential Pin Configurations
Differential DQ output data pins can be configured into a maximum of 8 groups using x8 DQS trees, with a maximum of 5 differential DQ data pins per group except for the RZQ lane. The RZQ lane can have a maximum of 4 differential DQ data pins. For instance, using a single-ended ref_clk reserved on pin 36 or 37 (Lane 3) and using differential strobe pins, the maximum number of single-ended DQ output data pins in this 8-group configuration can be determined as follows:
LANES 0, 1, 2, 4, 5, 6, and 7 : 7 groups/lanes x 5 DQ pins = 35 DQ pins
LANE 3 : 1 group/lane x 3 DQ pins = 3 DQ pins
TOTAL : 38 DQ pins
Differential DQ output data pins can also be configured into a maximum of 11 pins per group, with a maximum of 4 groups using x16 DQS trees. Using the same scenario of a single-ended ref_clk reserved on pin 36 or 37 (Lane 3) and using differential strobe pins, the maximum number of single-ended DQ output data pins in this 4-group configuration can be determined as follows:
LANES 0-1, 4-5, and 6-7 : 3 groups x 11 DQ pins = 33 DQ pins
LANES 2-3 : 1 group x 9 DQ pins = 9 DQ pins
TOTAL : 42 DQ pins
Differential DQ input or bidirectional data pins cannot share the same lane as the RZQ pin. Thus, input or bidirectional data pins can be configured into a maximum of 7 groups using x8 DQS trees, with a maximum of 5 pins per group. Using the same scenario of a single-ended ref_clk reserved on pin 36 or 37 (Lane 3) and using differential strobe pins, the maximum number of differential DQ input or bidirectional data pins in this 7-group configuration can be determined as follows:
LANES 0, 1, 2, 4, 5, 6, and 7 : 7 groups/lanes x 5 DQ pins = 35 DQ pins
LANE 3 : 0 group/lane x 0 DQ pins = 0 DQ pins
TOTAL : 35 DQ pins
Differential input or bidirectional data pins can also be configured into a maximum of 4 groups using x16 DQS trees, with a maximum of 11 pins per group except for the RZQ lane, which cannot be shared with any input or bidirectional data pin. Using the same scenario of a single-ended ref_clk reserved on pin 36 or 37 (Lane 3) and using differential strobe pins, the maximum number of differential DQ input or bidirectional data pins in this 4-group configuration can be determined as follows:
LANES 0-1, 4-5, and 6-7 : 3 groups x 11 DQ pins = 33 DQ pins
LANE 2 : 1 group x 5 DQ pins = 5 DQ pins
LANE 3 : 0 group x 0 DQ pins = 0 DQ pins
Total : 38 DQ pins