First Revision

Author: mwrnd

README.md

@@ -1,2 +1,30 @@
-# SlimSAS8x_Breakout
-SlimSAS8x Breakout to U.FL/UMCC
+**Work-In-Progress**: [Gerbers ready](https://github.com/mwrnd/SlimSAS8x_Breakout/releases/tag/v0.1-alpha) but not yet ordered.
+
+
+# OpenCAPI-Compatible SlimSAS 8x Breakout
+
+[OpenCAPI](https://files.openpower.foundation/s/xSQPe6ypoakKQdq/download/25Gbps-spec-20171108.pdf)-compatible SlimSAS 8x to [U.FL/UMCC Connector](https://en.wikipedia.org/wiki/Hirose_U.FL) breakout using a **Host** version of the OpenCAPI **Carrier** pinout from the [ADM-PCIE-9V5 User Manual (Pg15-19of38)](https://www.alpha-data.com/xml/user_manuals/adm-pcie-9v5%20user%20manual_v1_4.pdf).
+
+
+# PCB Layout
+
+![SlimSAS 8x Breakout PCB Layout](img/SlimSAS8x_Breakout_PCB_Layout.png)
+
+All signals are length-matched to within 1mm both inter-pair and intra-pair.
+
+
+# Schematic
+
+![SlimSAS 8x Breakout Schematic](img/SlimSAS8x_Breakout_Schematic.png)
+
+
+# PCB Layer Stackup
+
+4-Layer PCB stackup taken from [JLCPCB](https://jlcpcb.com/capabilities/pcb-capabilities).
+
+![PCB Layer Stackup](img/Layer_Stackup.png)
+
+Differential Impedance parameters were calculated using the [DigiKey Online Calculator](https://www.digikey.com/en/resources/conversion-calculators/conversion-calculator-pcb-trace-impedance).
+
+![PCB Differential Impedance Calculation](img/PCB_Impedance_0.30mm_0.18mm_on_0.21mm_7628.png)
+

SlimSAS8x_Breakout.kicad_pcb

@@ -0,0 +1,77 @@
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+}