diff --git a/tb/baser.py b/tb/baser.py
index e89610bb0e95ba961a28c8728bff003c7518c4a0..e6a773584f366831c07fb05c0fc94504980f07d8 100644
--- a/tb/baser.py
+++ b/tb/baser.py
@@ -30,36 +30,11 @@ from cocotb.triggers import RisingEdge, Timer, First, Event
 from cocotb.utils import get_sim_time
 
 from cocotbext.eth.constants import (EthPre, XgmiiCtrl, BaseRCtrl, BaseRO,
-    BaseRSync, BaseRBlockType)
+    BaseRSync, BaseRBlockType, xgmii_ctrl_to_baser_mapping,
+    baser_ctrl_to_xgmii_mapping, block_type_term_lane_mapping)
 from cocotbext.eth import XgmiiFrame
 
 
-xgmii_ctrl_to_baser_mapping = {
-    XgmiiCtrl.IDLE:   BaseRCtrl.IDLE,
-    XgmiiCtrl.LPI:    BaseRCtrl.LPI,
-    XgmiiCtrl.ERROR:  BaseRCtrl.ERROR,
-}
-
-
-baser_ctrl_to_xgmii_mapping = {
-    BaseRCtrl.IDLE:   XgmiiCtrl.IDLE,
-    BaseRCtrl.LPI:    XgmiiCtrl.LPI,
-    BaseRCtrl.ERROR:  XgmiiCtrl.ERROR,
-}
-
-
-block_type_term_lane_mapping = {
-    BaseRBlockType.TERM_0:  0,
-    BaseRBlockType.TERM_1:  1,
-    BaseRBlockType.TERM_2:  2,
-    BaseRBlockType.TERM_3:  3,
-    BaseRBlockType.TERM_4:  4,
-    BaseRBlockType.TERM_5:  5,
-    BaseRBlockType.TERM_6:  6,
-    BaseRBlockType.TERM_7:  7,
-}
-
-
 class BaseRSerdesSource():
 
     def __init__(self, data, header, clock, enable=None, slip=None, scramble=True, reverse=False, *args, **kwargs):