From 2c6998db4ad3b663fa32384739bc11930be5afa2 Mon Sep 17 00:00:00 2001
From: Alejandro Soto <alejandro@34project.org>
Date: Mon, 2 Oct 2023 16:47:23 -0600
Subject: tb: implement verilated slaves

---
 tb/sim_slave.cpp | 60 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 60 insertions(+)
 create mode 100644 tb/sim_slave.cpp

(limited to 'tb/sim_slave.cpp')

diff --git a/tb/sim_slave.cpp b/tb/sim_slave.cpp
new file mode 100644
index 0000000..24528d2
--- /dev/null
+++ b/tb/sim_slave.cpp
@@ -0,0 +1,60 @@
+#include <cstdint>
+
+#include "avalon.hpp"
+#include "sim_slave.hpp"
+
+namespace taller::avalon
+{
+	sim_slave::sim_slave(verilated_slave &dev, std::uint32_t base, std::uint32_t size)
+	: slave(base, size, 4),
+	  dev(dev)
+	{
+		dev.avl_read = 0;
+		dev.avl_write = 0;
+	}
+
+	void sim_slave::tick() noexcept
+	{
+		if (latch) {
+			dev.avl_read = 0;
+			dev.avl_write = 0;
+		}
+	}
+
+	void sim_slave::tick_falling() noexcept
+	{
+		if ((dev.avl_read || dev.avl_write) && !dev.avl_waitrequest) {
+			latch = true;
+			latch_readdata = dev.avl_readdata;
+		}
+	}
+
+	bool sim_slave::read(std::uint32_t addr, std::uint32_t &data)
+	{
+		if (latch) {
+			data = latch_readdata;
+
+			latch = false;
+			return true;
+		} else if (!dev.avl_read && !dev.avl_write) {
+			dev.avl_read = 1;
+			dev.avl_address = addr;
+		}
+
+		return false;
+	}
+
+	bool sim_slave::write(std::uint32_t addr, std::uint32_t data, unsigned byte_enable)
+	{
+		if (latch) {
+			latch = false;
+			return true;
+		} else if (!dev.avl_read && !dev.avl_write) {
+			dev.avl_write = 1;
+			dev.avl_address = addr;
+			dev.avl_writedata = data;
+		}
+
+		return false;
+	}
+}
-- 
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