fix(sim): fix simulation errors

rtl/soc_top.v

@@ -30,6 +30,8 @@ LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
 THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 --------------------------------------------------------------------------------
 ------------------------------------------------------------------------------*/
+`timescale 1ns / 1ps
+
 //1f00_0000 apb
 //1f10_0000 dvi
 //1f20_0000 confreg
@@ -1571,8 +1573,8 @@ snix_axil_cdma_mux #(
     .AXIL_DATA_WIDTH (32),
     .ID_WIDTH        (4),  // 匹配 Crossbar 的 Master ID 宽度
     .USER_WIDTH      (1),
-    .PORTS           (8),
-    .FIFO_DEPTH      (64)   // 8 个独立通道
+    .PORTS           (4),  // 8 个通道
+    .FIFO_DEPTH      (64)   
 ) u_snix_axil_cdma_mux_8ch (
     .clk             (sys_clk),
     .rst_n           (sys_resetn), // 低电平复位