#80 Make sure that scan flops have the correct signal type for all pins in liberty files Issue opened by mithro From https://www.csee.umbc.edu/courses/graduate/CMPE641/Fall08/cpatel2/slides/lect05_LIB.pdf

Scan Cells

Requires a

test_cell

group to be defined along with the

ff

or

latch

group.

Two ff groups need to be defined, one in the cell (function defined with testing features) and one inside the

test_cell

group (without the testing features)

```

test_cell(){

```

Inside the test_cell group all pins are defined and test related pins are given a

signal_type

or

test_output_only

attribute

signal_type

can be:

• `test_scan_in`: scan input pin

• `test_scan_in_inverted`: inverted scan input

• `test_scan_out`: scan output pin

• `test_scan_out_inverted`: inverted scan output

• `test_scan_enable`: high on this pin puts it in test mode (scan and shift)

• `test_scan_enable_inverted`: same as above but inverted

• `test_scan_clock`: test scan clock for clocked-scan

google/skywater-pdk