diff --git a/tb/shinTest/ShinTopSpiTb.v b/tb/shinTest/ShinTopSpiTb.v
index 28ddfc3..aaab92b 100644
--- a/tb/shinTest/ShinTopSpiTb.v
+++ b/tb/shinTest/ShinTopSpiTb.v
@@ -709,7 +709,7 @@ task spi_trans( input [15:0] saddress, input [7:0] scmd, input [12:0] slength, i
 `endif
 
     idx <= sidx;
-    spi_1to4 = (idx < (`ALL_DEV_NUM * 4));
+    spi_1to4 = (sidx < (`ALL_DEV_NUM * 4));
 
     #5
     @(negedge sck)