diff --git a/Makefile b/Makefile
index 449c206..bb4f318 100644
--- a/Makefile
+++ b/Makefile
@@ -11,6 +11,9 @@ lint:
 serve_docs:
 	mkdocs serve
 
+src_loc:
+	find src -type f \( -iname \*.sv -o -iname \*.v -o -iname \*.py -o -iname \*.yaml -o -iname \*.md \) | sed 's/.*/"&"/' | xargs  wc -l
+
 total_loc:
 	find . -type f \( -iname \*.sv -o -iname \*.v -o -iname \*.py -o -iname \*.yaml -o -iname \*.yml -o -iname \*.md \) | sed 's/.*/"&"/' | xargs  wc -l
 
@@ -31,6 +34,11 @@ auto_gen:
 # Functional Simulation
 functional_sim: io_core_tb logic_analyzer_tb bit_fifo_tb bridge_rx_tb bridge_tx_tb lut_mem_tb
 
+ethernet_tx_tb:
+	iverilog -g2012 -o sim.out -y src/manta/ether_iface test/functional_sim/ethernet_tx_tb.sv
+	vvp sim.out
+	rm sim.out
+
 ethernet_rx_tb:
 	iverilog -g2012 -o sim.out -y src/manta/ether_iface test/functional_sim/ethernet_rx_tb.sv
 	vvp sim.out
diff --git a/examples/nexys_a7/lut_mem_ether/manta.yaml b/examples/nexys_a7/lut_mem_ether/manta.yaml
index f9f4150..3b0a94f 100644
--- a/examples/nexys_a7/lut_mem_ether/manta.yaml
+++ b/examples/nexys_a7/lut_mem_ether/manta.yaml
@@ -5,4 +5,4 @@ cores:
     size: 64
 
 ethernet:
-  interface: "en3"
\ No newline at end of file
+  interface: "en8"
\ No newline at end of file
diff --git a/examples/nexys_a7/lut_mem_ether/read_write_test.py b/examples/nexys_a7/lut_mem_ether/read_write_test.py
index 600cc24..c90535b 100644
--- a/examples/nexys_a7/lut_mem_ether/read_write_test.py
+++ b/examples/nexys_a7/lut_mem_ether/read_write_test.py
@@ -1,17 +1,7 @@
 from manta import Manta
 from random import randint
 
-m = Manta('manta.yaml')
-
-from manta import Manta
-from time import sleep
-
 m = Manta("manta.yaml")
-print(m.my_lut_mem.read(0))
-
-m.my_lut_mem.write(0, 5)
-
-print(m.my_lut_mem.read(0))
 
 # for addr in range(m.my_lut_mem.size):
 #     write_data = randint(0, (2**16)-1)
@@ -19,4 +9,41 @@ print(m.my_lut_mem.read(0))
 
 #     read_data = m.my_lut_mem.read(addr)
 #     print(f"test addr: {addr} with data: {write_data}")
-#     print(f" -> correct data received on readback?: {write_data == read_data}")
\ No newline at end of file
+#     print(f" -> correct data received on readback?: {write_data == read_data}")
+
+# addrs = list(range(m.my_lut_mem.size))
+# datas = addrs
+# print(m.my_lut_mem.interface.read_batch(addrs))
+
+
+# internal rage intensifies
+
+# try writing a single register at a time which is known good,
+# and then read them back all at once
+
+# m.my_lut_mem.write(39, 42069)
+# m.my_lut_mem.write(40, 42070)
+
+# print(m.my_lut_mem.read(39))
+# print(m.my_lut_mem.read(40))
+# print(m.my_lut_mem.interface.read_batch([39,40]))
+
+# exit()
+
+# ok so i think i kind of understand the issue
+# so basically what's happening here is that whatever is in the
+# 16's place of the write data at the last write persists in all the reads, meaning
+
+#addrs = list(range(48))
+addrs = list(range(m.my_lut_mem.size))
+print(addrs)
+print('\n')
+
+from time import sleep
+
+for addr in addrs:
+   m.my_lut_mem.write(addr, addr)
+   sleep(0.1)
+
+print([m.my_lut_mem.read(addr) for addr in addrs])
+print('\n')
\ No newline at end of file
diff --git a/examples/nexys_a7/lut_mem_ether/top_level.sv b/examples/nexys_a7/lut_mem_ether/top_level.sv
index 48d9496..e9d1f4c 100644
--- a/examples/nexys_a7/lut_mem_ether/top_level.sv
+++ b/examples/nexys_a7/lut_mem_ether/top_level.sv
@@ -26,15 +26,7 @@ module top_level (
     assign eth_refclk = clk_50mhz;
     divider d (.clk(clk), .ethclk(clk_50mhz));
 
-    assign led = manta_inst.brx_my_lut_mem_addr;
-    assign led16_r = manta_inst.brx_my_lut_mem_rw;
-    assign led17_r = manta_inst.brx_my_lut_mem_valid;
 
-    ssd ssd (
-        .clk(clk_50mhz),
-        .val( {manta_inst.my_lut_mem_btx_rdata, manta_inst.brx_my_lut_mem_wdata} ),
-        .cat({cg,cf,ce,cd,cc,cb,ca}),
-        .an(an));
 
     manta manta_inst (
         .clk(clk_50mhz),
@@ -44,6 +36,25 @@ module top_level (
         .txen(eth_txen),
         .txd(eth_txd));
 
+    // debugging!
+    initial led17_r = 0;
+    reg [31:0] val = 0;
+
+    always @(posedge clk_50mhz) begin
+        if(manta_inst.my_lut_mem.valid_o) begin
+            led <= manta_inst.my_lut_mem.addr_o;
+            led16_r <= manta_inst.my_lut_mem.rw_o;
+            led17_r <= !led17_r;
+            val <= {manta_inst.my_lut_mem.rdata_o, manta_inst.my_lut_mem.wdata_o};
+        end
+    end
+
+    ssd ssd (
+        .clk(clk_50mhz),
+        .val(val),
+        .cat({cg,cf,ce,cd,cc,cb,ca}),
+        .an(an));
+
 
 endmodule
 
diff --git a/src/manta/ether_iface/__init__.py b/src/manta/ether_iface/__init__.py
index acdb9f2..f7cf62b 100644
--- a/src/manta/ether_iface/__init__.py
+++ b/src/manta/ether_iface/__init__.py
@@ -1,15 +1,16 @@
 from ..hdl_utils import *
 
+# Lazy and selective imports for quick builds!
+from scapy.interfaces import get_if_list
+from scapy.arch import get_if_hwaddr
+from scapy.layers.l2 import Ether
+from scapy.sendrecv import AsyncSniffer, sendp, sendpfast
+from time import sleep
+
+from scapy.all import *
+
 class EthernetInterface:
     def __init__(self, config):
-
-        # Lazy and selective imports for quick builds!
-        from scapy.interfaces import get_if_list
-        from scapy.arch import get_if_hwaddr
-        from scapy.layers.l2 import Ether
-        from scapy.sendrecv import AsyncSniffer, sendp, sendpfast
-        from time import sleep
-
         # Warn if unrecognized options have been given
         for option in config:
             if option not in ["interface", "host_mac", "fpga_mac", "ethertype", "tcpreplay", "verbose"]:
@@ -81,7 +82,7 @@ class EthernetInterface:
 
         assert len(results) == 1, "Received more packets than expected!"
 
-        raw_response_bytes = bytes(results[0].payload)[0:2]
+        raw_response_bytes = bytes(results[0].payload)[3:5]
         return int.from_bytes(raw_response_bytes, 'big')
 
     def write_register(self, addr, data):
@@ -99,61 +100,69 @@ class EthernetInterface:
         pkt.load = msg
         self.send_packet(pkt, iface=self.iface, verbose = self.verbose)
 
-    # def read_batch(addrs):
-    #     pkts = []
-    #     for addr in addrs:
-    #         pkt = Ether()
-    #         pkt.src = src_mac
-    #         pkt.dst = dst_mac
-    #         pkt.type = 0x0002
+    def read_batch(self, addrs):
+        # Prepare packets to read from addresses
+        pkts = []
+        for addr in addrs:
+            pkt = Ether()
+            pkt.src = self.host_mac
+            pkt.dst = self.fpga_mac
+            pkt.type = self.ethertype
 
-    #         # two bytes of address, and 44 of padding
-    #         # makes the 46 byte minimum length
-    #         msg = addr.to_bytes(2, 'big') + 44*b'\x00'
+            # one byte of rw, two bytes of address, and 44 of padding
+            # makes the 46 byte minimum length
+            msg = b'\x00' + addr.to_bytes(2, 'big') + 43*b'\x00'
 
-    #         pkt = pkt / msg
-    #         pkt.load = msg
-    #         pkts.append(pkt)
+            pkt = pkt / msg
+            pkt.load = msg
+            pkts.append(pkt)
 
-    #     sniffer = AsyncSniffer(iface = iface, count = len(addrs), filter="ether src 69:69:5a:06:54:91")
-    #     sniffer.start()
-    #     from time import sleep
-    #     time.sleep(0.1)
+        # Start sniffer in another thread, send packets, grab responses
+        sniffer = AsyncSniffer(iface = self.iface, count = len(addrs), filter=f"ether src {self.fpga_mac}")
+        sniffer.start()
+        sleep(0.1)
+        sendp(pkts, iface=self.iface, verbose = 0, inter = 0.05)
+        sniffer.join()
+        results = sniffer.results
 
-    #     sendp(pkts, iface=iface, verbose = 0)
-    #     sniffer.join()
-    #     results = sniffer.results
+        assert len(results) == len(addrs), "Received more packets than expected!"
 
-    #     assert len(results) == len(addrs), "Received more packets than expected!"
+        # #print(raw(results[1]))
+        # for packet in results:
+        #     hexdump(packet)
+        #     print( [i for i in bytes(packet.payload)] )
+        #     print( [i for i in raw(packet)] )
+        #     print("\n")
 
-    #     datas = []
-    #     for packet in results:
-    #         raw_response_bytes = bytes(packet.payload)[0:2]
-    #         data = int.from_bytes(raw_response_bytes, 'big')
-    #         datas.append(data)
+        # Parse packets
+        datas = []
+        for packet in results:
+            raw_response_bytes = bytes(packet.payload)[3:5]
+            data = int.from_bytes(raw_response_bytes, 'big')
+            datas.append(data)
 
-    #     return datas
+        return datas
 
-    # def write_batch(addrs, data):
-    #     pkts = []
-    #     for i in range(len(addrs)):
-    #         pkt = Ether()
-    #         pkt.src = src_mac
-    #         pkt.dst = dst_mac
-    #         pkt.type = 0x0002
+    def write_batch(self, addrs, datas):
+        assert len(addrs) == len(datas), \
+            "Number of addresses provided is unequal to number of data provided!"
 
-    #         addr = addrs[i]
-    #         data = datas[i]
+        pkts = []
+        for addr, data in zip(addrs, datas):
+            pkt = Ether()
+            pkt.src = self.host_mac
+            pkt.dst = self.fpga_mac
+            pkt.type = self.ethertype
 
-    #         # two bytes of address, two bytes of
-    #         # data, and 42 of padding makes the 46 byte
-    #         # minimum length
-    #         msg = addr.to_bytes(2, 'big') + data.to_bytes(2, 'big') + 42*b'\x00'
+            # one byte of rw, two bytes of address, two bytes of data, and 41
+            # bytes of paddding make the 46 byte limit.
+            msg = b'\x01' + addr.to_bytes(2, 'big') + data.to_bytes(2, 'big') + 41*b'\x00'
 
-    #         pkt = pkt / msg
-    #         pkt.load = msg
+            pkt = pkt / msg
+            pkt.load = msg
+            pkts.append(pkt)
 
-    # sendp(pkts, iface=iface, verbose = 0)
+        self.send_packet(pkts, iface=self.iface, verbose = 0)
 
     def hdl_top_level_ports(self):
         return ["input wire crsdv", \
diff --git a/src/manta/ether_iface/ethernet_rx.v b/src/manta/ether_iface/ethernet_rx.v
index 55eee87..f057709 100644
--- a/src/manta/ether_iface/ethernet_rx.v
+++ b/src/manta/ether_iface/ethernet_rx.v
@@ -34,7 +34,7 @@ module ethernet_rx (
         assign rw_o = (payload[39:32] == 8'd1);
         assign addr_o = payload[31:16];
         assign wdata_o = payload[15:0];
-        assign valid_o = valid && ( payload[39:32] == 8'd0 || payload[39:32] == 8'd1);
+        assign valid_o = valid && ( payload[39:32] == 8'd0 || payload[39:32] == 8'd1) && (payload[55:40] == 16'h88B5);
 
 endmodule
 
diff --git a/src/manta/ether_iface/ethernet_tx.v b/src/manta/ether_iface/ethernet_tx.v
index 08e82c7..cce4110 100644
--- a/src/manta/ether_iface/ethernet_tx.v
+++ b/src/manta/ether_iface/ethernet_tx.v
@@ -29,7 +29,7 @@ module ethernet_tx (
     ) mtx (
         .clk(clk),
 
-        .payload(rdata_buf),
+        .payload({24'd0, rdata_buf}),
         .start(~rw_i && valid_i),
 
         .txen(txen),
diff --git a/test/functional_sim/ethernet_tx_tb.sv b/test/functional_sim/ethernet_tx_tb.sv
new file mode 100644
index 0000000..6883fd7
--- /dev/null
+++ b/test/functional_sim/ethernet_tx_tb.sv
@@ -0,0 +1,121 @@
+`default_nettype none
+//`timescale 1ns/1ps
+
+`define FPGA_MAC 48'h69_69_5A_06_54_91
+`define HOST_MAC 48'h00_E0_4C_68_1E_0C
+`define ETHERTYPE 16'h88_B5
+
+task send_on_etx_receive_on_mrx (
+    input [15:0] data
+    );
+
+    ethernet_tx_tb.etx_rdata = data;
+    ethernet_tx_tb.etx_rw = 0;
+    ethernet_tx_tb.etx_valid = 0;
+    #10;
+    ethernet_tx_tb.etx_valid = 1;
+    #10;
+    ethernet_tx_tb.etx_valid = 0;
+
+    while(!ethernet_tx_tb.mrx_valid) #10;
+
+    $display(ethernet_tx_tb.mrx_payload);
+endtask
+
+module ethernet_tx_tb();
+
+    // https://www.youtube.com/watch?v=K35qOTQLNpA
+    logic clk;
+
+    always begin
+        #5;
+        clk = !clk;
+    end
+
+    logic txen;
+    logic [1:0] txd;
+
+    // ethernet tx
+    reg [15:0] etx_rdata;
+    reg etx_rw;
+    reg etx_valid;
+
+    ethernet_tx #(
+        .FPGA_MAC(`FPGA_MAC),
+        .HOST_MAC(`HOST_MAC),
+        .ETHERTYPE(`ETHERTYPE)
+    ) etx (
+        .clk(clk),
+
+        .rdata_i(etx_rdata),
+        .rw_i(etx_rw),
+        .valid_i(etx_valid),
+
+        .txen(txen),
+        .txd(txd));
+
+    // mac_rx, for decoding
+    logic crsdv;
+    logic [1:0] rxd;
+
+    reg [55:0] mrx_payload;
+    reg mrx_valid;
+
+    mac_rx #(
+        // this is the host mac since we're using mac_rx to impersonate
+        // the host computer, to which packets are currently addressed.
+
+        .FPGA_MAC(`HOST_MAC),
+        .ETHERTYPE(`ETHERTYPE)
+    ) mrx (
+        .clk(clk),
+
+        .crsdv(crsdv),
+        .rxd(rxd),
+
+        .payload(mrx_payload),
+        .valid(mrx_valid));
+
+    logic [15:0] where_ethertype_should_be;
+    logic [7:0] where_rw_should_be;
+    logic [15:0] where_addr_should_be;
+    logic [15:0] where_data_should_be;
+    assign {where_ethertype_should_be, where_rw_should_be, where_addr_should_be, where_data_should_be} = mrx_payload;
+
+    assign rxd = txd;
+    assign crsdv = txen;
+
+    initial begin
+        $dumpfile("ethernet_tx_tb.vcd");
+        $dumpvars(0, ethernet_tx_tb);
+        clk = 0;
+        etx_rdata = 16'h6970;
+        etx_rw = 0;
+        etx_valid = 0;
+        #50;
+
+        send_on_etx_receive_on_mrx(16'h6970);
+
+        #10000;
+
+
+
+
+        // for (int i=0; i<32; i=i+1) begin
+        //     mtx_payload = i;
+        //     mtx_start = 0;
+        //     #10;
+        //     mtx_start = 1;
+        //     #10;
+        //     mtx_start = 0;
+        //     while(!mrx_valid) #10;
+
+        //     #1000;
+
+        //     assert(mrx_payload == i) else $error("data mismatch!");
+        // end
+        $finish();
+    end
+
+endmodule
+`default_nettype wire
\ No newline at end of file