Make some changes to README.md

Signed-off-by: Franck Jullien <franck.jullien@gmail.com>

README.md

@@ -3,15 +3,14 @@ jtag_vpi
 
 TCP/IP controlled VPI JTAG Interface.
 
-    +---------------     +----------------+      +----------------+      +------------------+      +----------+
-    +              +     +                +      +                +      +                  +      +          +
-    + OpenOCD core + --> + JAG VIP driver + <==> + JAG VIP server + <--> + JTAG VPI verilog + <--> + JTAG TAP +
-    +              +     +                +      +                +      +                  +      +          +
-    +---------------     +----------------+      +----------------+      +------------------+      +----------+
-                             jtag_vpi.c              jtag_vpi.c               jtag_vpi.v             any tap...
-    --------------------------------------- TCP  ------------------  VPI --------------------------------------
-    ---------------------------------------      --------------------------------------------------------------
-                  OpenOCD                                                VPI + Verilog RTL
+    +------------------+     +-----------------+     +------------------+      +----------+
+    +                  +     +                 +     +                  +      +          +
+    + Testbench client + <=> + JTAG VPI server + <-> + JTAG VPI verilog + <--> + JTAG TAP +
+    +                  +     +                 +     +                  +      +          +
+    +------------------+     +-----------------+     +------------------+      +----------+
+        test_client.c             jtag_vpi.c               jtag_vpi.v             any tap...
+    -------------------- TCP  ------------------  VPI ---------------------   --------------
+    --------------------      ---------------------------------------------   --------------
 
 A testbench is provided and can be run with: