diff --git a/tb/shinTest/ShinTopSpiTb.v b/tb/shinTest/ShinTopSpiTb.v
index aaab92b..3bb1c4c 100644
--- a/tb/shinTest/ShinTopSpiTb.v
+++ b/tb/shinTest/ShinTopSpiTb.v
@@ -701,10 +701,14 @@ task spi_trans( input [15:0] saddress, input [7:0] scmd, input [12:0] slength, i
 `else
     txBuf[2] <= (scmd | slength[12:8]);
     txBuf[3] <= slength[7:0];
-    if (sidx >=(`ALL_DEV_NUM * 3)) begin
-      length <= slength + 4 + 1;
-    end else begin
+    if (sidx < (`ALL_DEV_NUM * 3)) begin
       length <= slength + 4;
+    end else if (sidx < (`ALL_DEV_NUM * 4)) begin
+      length <= slength + 4 + 1;
+    end else if (sidx < (`ALL_DEV_NUM * 5)) begin
+      length <= slength + 4;
+    end else begin
+      length <= slength + 4 + 1;
     end
 `endif