diff --git a/rtl/perips/spi/spi.hjson b/rtl/perips/spi/spi.hjson
index d03cd24..099517f 100644
--- a/rtl/perips/spi/spi.hjson
+++ b/rtl/perips/spi/spi.hjson
@@ -59,6 +59,16 @@
           name: "SS_DELAY",
           desc: "SPI ss signal active or inactive how many spi clk",
         }
+        { bits: "16",
+          name: "TX_FIFO_RESET",
+          swaccess: "rw1c",
+          desc: "reset tx fifo",
+        }
+        { bits: "17",
+          name: "RX_FIFO_RESET",
+          swaccess: "rw1c",
+          desc: "reset rx fifo",
+        }
         { bits: "31:29",
           name: "CLK_DIV",
           desc: "SPI clock divider count",
@@ -99,7 +109,7 @@
       hwaccess: "hro",
       hwqe: "true",
       fields: [
-        { bits: "7:0" }
+        { bits: "31:0" }
       ]
     }
     { name: "RXDATA",
@@ -109,7 +119,7 @@
       hwext: "true",
       hwre: "true",
       fields: [
-        { bits: "7:0" }
+        { bits: "31:0" }
       ]
     }
   ]
diff --git a/rtl/perips/spi/spi_core.sv b/rtl/perips/spi/spi_core.sv
index 7ac4068..9e1fb35 100644
--- a/rtl/perips/spi/spi_core.sv
+++ b/rtl/perips/spi/spi_core.sv
@@ -84,12 +84,14 @@ module spi_core #(
     logic tx_fifo_push;
     logic [7:0] tx_fifo_data_out;
     logic tx_fifo_pop;
+    logic tx_fifo_flush;
     logic rx_fifo_full;
     logic rx_fifo_empty;
     logic [7:0] rx_fifo_data_in;
     logic rx_fifo_push;
     logic [7:0] rx_fifo_data_out;
     logic rx_fifo_pop;
+    logic rx_fifo_flush;
 
     assign master_enable        = ~reg2hw.ctrl0.role_mode.q;
     assign master_start         = reg2hw.ctrl0.enable.q && (!tx_fifo_empty);
@@ -103,13 +105,15 @@ module spi_core #(
     assign master_ss_level      = reg2hw.ctrl0.ss_level.q;
 
     assign tx_fifo_push     = reg2hw.txdata.qe;
-    assign tx_fifo_data_in  = reg2hw.txdata.q;
+    assign tx_fifo_data_in  = reg2hw.txdata.q[7:0];
     assign tx_fifo_pop      = master_data_valid_re | master_ready_fe;
+    assign tx_fifo_flush    = reg2hw.ctrl0.tx_fifo_reset.q && reg2hw.ctrl0.tx_fifo_reset.qe;
     // 读操作才把接收到的数据压入RX FIFO
     assign rx_fifo_push     = master_data_valid_re & master_read;
     assign rx_fifo_data_in  = master_data_out;
     assign rx_fifo_pop      = reg2hw.rxdata.re;
-    assign hw2reg.rxdata.d  = rx_fifo_data_out;
+    assign hw2reg.rxdata.d  = {24'h0, rx_fifo_data_out};
+    assign rx_fifo_flush    = reg2hw.ctrl0.rx_fifo_reset.q && reg2hw.ctrl0.rx_fifo_reset.qe;
 
     assign hw2reg.status.tx_fifo_full.d  = tx_fifo_full;
     assign hw2reg.status.tx_fifo_empty.d = tx_fifo_empty;
@@ -164,7 +168,7 @@ module spi_core #(
     ) u_tx_fifo (
         .clk_i      (clk_i),
         .rst_ni     (rst_ni),
-        .flush_i    (1'b0),
+        .flush_i    (tx_fifo_flush),
         .testmode_i (1'b0),
         .full_o     (tx_fifo_full),
         .empty_o    (tx_fifo_empty),
@@ -182,7 +186,7 @@ module spi_core #(
     ) u_rx_fifo (
         .clk_i      (clk_i),
         .rst_ni     (rst_ni),
-        .flush_i    (1'b0),
+        .flush_i    (rx_fifo_flush),
         .testmode_i (1'b0),
         .full_o     (rx_fifo_full),
         .empty_o    (rx_fifo_empty),
diff --git a/rtl/perips/spi/spi_reg_pkg.sv b/rtl/perips/spi/spi_reg_pkg.sv
index f532a63..042d6b2 100644
--- a/rtl/perips/spi/spi_reg_pkg.sv
+++ b/rtl/perips/spi/spi_reg_pkg.sv
@@ -58,6 +58,14 @@ package spi_reg_pkg;
       logic [3:0]  q;
       logic        qe;
     } ss_delay;
+    struct packed {
+      logic        q;
+      logic        qe;
+    } tx_fifo_reset;
+    struct packed {
+      logic        q;
+      logic        qe;
+    } rx_fifo_reset;
     struct packed {
       logic [2:0]  q;
       logic        qe;
@@ -83,12 +91,12 @@ package spi_reg_pkg;
   } spi_reg2hw_status_reg_t;
 
   typedef struct packed {
-    logic [7:0]  q;
+    logic [31:0] q;
     logic        qe;
   } spi_reg2hw_txdata_reg_t;
 
   typedef struct packed {
-    logic [7:0]  q;
+    logic [31:0] q;
     logic        re;
   } spi_reg2hw_rxdata_reg_t;
 
@@ -137,6 +145,14 @@ package spi_reg_pkg;
       logic [3:0]  d;
       logic        de;
     } ss_delay;
+    struct packed {
+      logic        d;
+      logic        de;
+    } tx_fifo_reset;
+    struct packed {
+      logic        d;
+      logic        de;
+    } rx_fifo_reset;
     struct packed {
       logic [2:0]  d;
       logic        de;
@@ -162,22 +178,22 @@ package spi_reg_pkg;
   } spi_hw2reg_status_reg_t;
 
   typedef struct packed {
-    logic [7:0]  d;
+    logic [31:0] d;
   } spi_hw2reg_rxdata_reg_t;
 
   // Register -> HW type
   typedef struct packed {
-    spi_reg2hw_ctrl0_reg_t ctrl0; // [53:23]
-    spi_reg2hw_status_reg_t status; // [22:18]
-    spi_reg2hw_txdata_reg_t txdata; // [17:9]
-    spi_reg2hw_rxdata_reg_t rxdata; // [8:0]
+    spi_reg2hw_ctrl0_reg_t ctrl0; // [105:71]
+    spi_reg2hw_status_reg_t status; // [70:66]
+    spi_reg2hw_txdata_reg_t txdata; // [65:33]
+    spi_reg2hw_rxdata_reg_t rxdata; // [32:0]
   } spi_reg2hw_t;
 
   // HW -> register type
   typedef struct packed {
-    spi_hw2reg_ctrl0_reg_t ctrl0; // [43:13]
-    spi_hw2reg_status_reg_t status; // [12:8]
-    spi_hw2reg_rxdata_reg_t rxdata; // [7:0]
+    spi_hw2reg_ctrl0_reg_t ctrl0; // [71:37]
+    spi_hw2reg_status_reg_t status; // [36:32]
+    spi_hw2reg_rxdata_reg_t rxdata; // [31:0]
   } spi_hw2reg_t;
 
   // Register offsets
@@ -188,7 +204,7 @@ package spi_reg_pkg;
 
   // Reset values for hwext registers and their fields
   parameter logic [4:0] SPI_STATUS_RESVAL = 5'h0;
-  parameter logic [7:0] SPI_RXDATA_RESVAL = 8'h0;
+  parameter logic [31:0] SPI_RXDATA_RESVAL = 32'h0;
 
   // Register index
   typedef enum int {
@@ -202,8 +218,8 @@ package spi_reg_pkg;
   parameter logic [3:0] SPI_PERMIT [4] = '{
     4'b1111, // index[0] SPI_CTRL0
     4'b0001, // index[1] SPI_STATUS
-    4'b0001, // index[2] SPI_TXDATA
-    4'b0001  // index[3] SPI_RXDATA
+    4'b1111, // index[2] SPI_TXDATA
+    4'b1111  // index[3] SPI_RXDATA
   };
 
 endpackage
diff --git a/rtl/perips/spi/spi_reg_top.sv b/rtl/perips/spi/spi_reg_top.sv
index d840fb5..5d55396 100644
--- a/rtl/perips/spi/spi_reg_top.sv
+++ b/rtl/perips/spi/spi_reg_top.sv
@@ -61,6 +61,10 @@ module spi_reg_top (
   logic ctrl0_ss_level_wd;
   logic [3:0] ctrl0_ss_delay_qs;
   logic [3:0] ctrl0_ss_delay_wd;
+  logic ctrl0_tx_fifo_reset_qs;
+  logic ctrl0_tx_fifo_reset_wd;
+  logic ctrl0_rx_fifo_reset_qs;
+  logic ctrl0_rx_fifo_reset_wd;
   logic [2:0] ctrl0_clk_div_qs;
   logic [2:0] ctrl0_clk_div_wd;
   logic status_re;
@@ -70,9 +74,9 @@ module spi_reg_top (
   logic status_rx_fifo_empty_qs;
   logic status_busy_qs;
   logic txdata_we;
-  logic [7:0] txdata_wd;
+  logic [31:0] txdata_wd;
   logic rxdata_re;
-  logic [7:0] rxdata_qs;
+  logic [31:0] rxdata_qs;
 
   // Register instances
   // R[ctrl0]: V(False)
@@ -363,6 +367,58 @@ module spi_reg_top (
   );
 
 
+  //   F[tx_fifo_reset]: 16:16
+  prim_subreg #(
+    .DW      (1),
+    .SWACCESS("W1C"),
+    .RESVAL  (1'h0)
+  ) u_ctrl0_tx_fifo_reset (
+    .clk_i   (clk_i),
+    .rst_ni  (rst_ni),
+
+    // from register interface
+    .we     (ctrl0_we),
+    .wd     (ctrl0_tx_fifo_reset_wd),
+
+    // from internal hardware
+    .de     (hw2reg.ctrl0.tx_fifo_reset.de),
+    .d      (hw2reg.ctrl0.tx_fifo_reset.d),
+
+    // to internal hardware
+    .qe     (reg2hw.ctrl0.tx_fifo_reset.qe),
+    .q      (reg2hw.ctrl0.tx_fifo_reset.q),
+
+    // to register interface (read)
+    .qs     (ctrl0_tx_fifo_reset_qs)
+  );
+
+
+  //   F[rx_fifo_reset]: 17:17
+  prim_subreg #(
+    .DW      (1),
+    .SWACCESS("W1C"),
+    .RESVAL  (1'h0)
+  ) u_ctrl0_rx_fifo_reset (
+    .clk_i   (clk_i),
+    .rst_ni  (rst_ni),
+
+    // from register interface
+    .we     (ctrl0_we),
+    .wd     (ctrl0_rx_fifo_reset_wd),
+
+    // from internal hardware
+    .de     (hw2reg.ctrl0.rx_fifo_reset.de),
+    .d      (hw2reg.ctrl0.rx_fifo_reset.d),
+
+    // to internal hardware
+    .qe     (reg2hw.ctrl0.rx_fifo_reset.qe),
+    .q      (reg2hw.ctrl0.rx_fifo_reset.q),
+
+    // to register interface (read)
+    .qs     (ctrl0_rx_fifo_reset_qs)
+  );
+
+
   //   F[clk_div]: 31:29
   prim_subreg #(
     .DW      (3),
@@ -469,9 +525,9 @@ module spi_reg_top (
   // R[txdata]: V(False)
 
   prim_subreg #(
-    .DW      (8),
+    .DW      (32),
     .SWACCESS("WO"),
-    .RESVAL  (8'h0)
+    .RESVAL  (32'h0)
   ) u_txdata (
     .clk_i   (clk_i),
     .rst_ni  (rst_ni),
@@ -496,7 +552,7 @@ module spi_reg_top (
   // R[rxdata]: V(True)
 
   prim_subreg_ext #(
-    .DW    (8)
+    .DW    (32)
   ) u_rxdata (
     .re     (rxdata_re),
     .we     (1'b0),
@@ -553,11 +609,15 @@ module spi_reg_top (
 
   assign ctrl0_ss_delay_wd = reg_wdata[15:12];
 
+  assign ctrl0_tx_fifo_reset_wd = reg_wdata[16];
+
+  assign ctrl0_rx_fifo_reset_wd = reg_wdata[17];
+
   assign ctrl0_clk_div_wd = reg_wdata[31:29];
   assign status_re = addr_hit[1] & reg_re & !reg_error;
   assign txdata_we = addr_hit[2] & reg_we & !reg_error;
 
-  assign txdata_wd = reg_wdata[7:0];
+  assign txdata_wd = reg_wdata[31:0];
   assign rxdata_re = addr_hit[3] & reg_re & !reg_error;
 
   // Read data return
@@ -576,6 +636,8 @@ module spi_reg_top (
         reg_rdata_next[10] = ctrl0_ss_sw_ctrl_qs;
         reg_rdata_next[11] = ctrl0_ss_level_qs;
         reg_rdata_next[15:12] = ctrl0_ss_delay_qs;
+        reg_rdata_next[16] = ctrl0_tx_fifo_reset_qs;
+        reg_rdata_next[17] = ctrl0_rx_fifo_reset_qs;
         reg_rdata_next[31:29] = ctrl0_clk_div_qs;
       end
 
@@ -588,11 +650,11 @@ module spi_reg_top (
       end
 
       addr_hit[2]: begin
-        reg_rdata_next[7:0] = '0;
+        reg_rdata_next[31:0] = '0;
       end
 
       addr_hit[3]: begin
-        reg_rdata_next[7:0] = rxdata_qs;
+        reg_rdata_next[31:0] = rxdata_qs;
       end
 
       default: begin