TEWKSBURY, Mass.--(BUSINESS WIRE)--Avery Design Systems Inc., an innovator in functional verification productivity solutions, today announced availability of DDR4 3D Stacking (3DS) support for its DDR4 memory chip and LRDIMM Verification IP (VIP) models and compliance testsuites. DDR-Xactor VIP supports SDRAM memory chip models RDIMM/LRDIMM models including RCD and DB DFI-PHY model Memory controller model including initialization, training, and auto sequencing commands I2C models RDIMM/LRDIMM c