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## Microcode terms 

The microcode features the following characteristics: 

GLYPH<SM590000> The driver contains engineering change (EC) streams. 

GLYPH<SM590000> Each EC stream covers the code for a specific component of z14 servers. It includes a specific name and an ascending number. 

GLYPH<SM590000> The EC stream name and a specific number are one MCL. 

GLYPH<SM590000> MCLs from the same EC stream must be installed in sequence. 

GLYPH<SM590000> MCLs can include installation dependencies on other MCLs. 

GLYPH<SM590000> Combined MCLs from one or more EC streams are in one bundle. 

GLYPH<SM590000> An MCL contains one or more Microcode Fixes (MCFs). 

How the driver, bundle, EC stream, MCL, and MCFs interact with each other is shown in Figure 11-20. 

<img src='content_image/1009021.jpg'>

