![JTAG External Modules (JEM) DIMM/SODIMM Socket Cluster Test](https://d27wgn5g4t3wja.cloudfront.net/products/c193f236-0cd9-4a13-9cab-9d4c43c1ad10/465953.png)
JTAG External Modules (JEM) DIMM/SODIMM Socket Cluster Test
The primary function of the JTAG External Modules (JEM) for the DIMM/SODIMM Socket Cluster Test is to provide test access to off-board signals that otherwise could not be accessed by a JTAG test system and to strengthen the memory-independent JTAG testing for the assembly correctness of the almost full spectrum of the modern socket types, particularly (according to JEDEC_Std.21-C):