增加1个字节,简单的规避aqspi的csn被过早拉高的问题

tb/shinTest/ShinTopSpiTb.v

@@ -627,7 +627,7 @@ task spi_trans( input [15:0] saddress, input [7:0] scmd, input [12:0] slength, i
     if (sidx >=(`ALL_DEV_NUM * 3)) begin
         txBuf[2] <= (scmd | slength[12:8]);
         txBuf[3] <= slength[7:0];
-        length <= slength + 4;
+        length <= slength + 4 + 1;
     end else begin
         txBuf[2] <= scmd;
         length <= slength + 3;