From 3a69b0eda0739b23f813d7b76d1385a89e76523f Mon Sep 17 00:00:00 2001 From: Alan Garfield Date: Tue, 2 Jan 2018 01:15:44 +1100 Subject: [PATCH] Update README.md --- README.md | 10 ++++++++++ 1 file changed, 10 insertions(+) diff --git a/README.md b/README.md index 63a2118..197f2d7 100644 --- a/README.md +++ b/README.md @@ -44,6 +44,16 @@ Registers: This project should just build with IceCube2 without any issue, and I will figure out how to make it work with Yosys shortly. + ## External Devices / Hook-up + + To connect the LED&KEYs to the breakout board the following pins are defined in the constraints file. + + Pin | ID | Description + --- | -- | ----------- + P1 | CLK | The clock used to clock data in and out of the LED&KEYs + P2 | DIO | The tristate digital I/O pin + R1 | STB | The "chipselect" / strobe line + ## Serial Setup To communicate with the Apple 1 you need to use the second channel serial interface for the iCE40HX8K-B-EVN board. This should appear as a COM port on you PC. This project is configured to use the 12MHz onboard clock to generate the baud rate, and as such I've selected 4800 baud (8/N/1) as this was the only baud rate that rounded nicely to 12MHz without an error rate.