diff --git a/milkymist/asmicon/bankmachine.py b/milkymist/asmicon/bankmachine.py
index f0b8ac5c7..12022b23c 100644
--- a/milkymist/asmicon/bankmachine.py
+++ b/milkymist/asmicon/bankmachine.py
@@ -119,11 +119,13 @@ class _Selector:
 			for slot in self.slots]
 		comb += multimux(rr.grant, mux_inputs, mux_outputs)
 		comb += [
-			self.stb.eq(state == SLOT_PENDING),
+			self.stb.eq(
+				(self.slicer.bank(self.adr) == self.bankn) \
+				& (state == SLOT_PENDING)),
 			rr.ce.eq(self.ack),
 			self.tag.eq(rr.grant)
 		]
-		comb += [slot.process.eq((rr.grant == i) & self.stb & self.ack)
+		comb += [If((rr.grant == i) & self.stb & self.ack, slot.process.eq(1))
 			for i, slot in enumerate(self.slots)]
 		
 		return Fragment(comb, sync) + rr.get_fragment()
diff --git a/milkymist/asmicon/multiplexer.py b/milkymist/asmicon/multiplexer.py
index da1818b5c..6b459262a 100644
--- a/milkymist/asmicon/multiplexer.py
+++ b/milkymist/asmicon/multiplexer.py
@@ -53,11 +53,11 @@ class _CommandChooser:
 		outputs_filtered = [self.cmd.cas_n, self.cmd.ras_n, self.cmd.we_n]
 		ms = multimux(rr.grant, inputs_filtered, outputs_filtered)
 		comb += [
-			self.cmd.stb.eq(stb & ((self.cmd.is_read == self.want_reads) | (self.cmd.is_write == self.want_writes))),
+			self.cmd.stb.eq(stb & (self.cmd.is_read == self.want_reads) & (self.cmd.is_write == self.want_writes)),
 			If(self.cmd.stb, *ms)
 		]
 		
-		comb += [req.ack.eq(self.cmd.stb & self.cmd.ack & rr.grant == i)
+		comb += [If(self.cmd.stb & self.cmd.ack & (rr.grant == i), req.ack.eq(1))
 			for i, req in enumerate(self.requests)]
 		comb.append(rr.ce.eq(self.cmd.ack))