add function unit read/write pending

[ieee754fpu.git] / src / scoreboard / fu_wr_pending.py

diff --git a/src/scoreboard/fu_wr_pending.py b/src/scoreboard/fu_wr_pending.py
new file mode 100644 (file)
index 0000000..9bba20e
--- /dev/null
+++ b/src/scoreboard/fu_wr_pending.py
@@ -0,0 +1,20 @@
+from nmigen import Elaboratable, Module, Signal
+
+
+class FUReadWritePending(Elaboratable):
+    def __init__(self, reg_count):
+        self.reg_count = reg_count
+        self.dest_fwd_i = Signal(fu_count, reset_less=True)
+        self.src1_fwd_i = Signal(fu_count, reset_less=True)
+        self.src2_fwd_i = Signal(fu_count, reset_less=True)
+
+        self.wr_pend_o = Signal(reset_less=True)
+        self.rd_pend_o = Signal(reset_less=True)
+
+    def elaboratable(self, platform):
+        m = Module()
+        srces = Cat(self.src1_fwd_i, self.src2_fwd_i)
+        m.d.comb += self.wr_pend_o.eq(self.dest_fwd_i.bool())
+        m.d.comb += self.rd_pend_o.eq(srces.bool() 
+        return m
+