diff --git a/src/libboard_artiq/src/cxp_upconn.rs b/src/libboard_artiq/src/cxp_upconn.rs
index decac45..4c5c7f9 100644
--- a/src/libboard_artiq/src/cxp_upconn.rs
+++ b/src/libboard_artiq/src/cxp_upconn.rs
@@ -5,15 +5,17 @@ use crate::pl::csr;
 
 pub fn pipeline_test(timer: &mut GlobalTimer) {
     let arr = [
-        0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08
-        // 0x00, 0x00, 0x00, 0x04, 0x00, 0x00, 0x00, 0x00, // CXP CRC-32
-         // 0x56, 0x86, 0x5D, 0x6f,
+        // 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08
+        0x00, 0x00, 0x00, 0x04, 0x00, 0x00, 0x00, 0x00, // CXP CRC-32
+             // 0x56, 0x86, 0x5D, 0x6f,
     ];
 
-    const LEN: usize = 12;
+    const LEN: usize = 20;
     let mut pak_arr: [u8; LEN] = [0; LEN];
 
     unsafe {
+        csr::cxp::txcore_din_len_write(arr.len() as u8);
+
         for a in arr.iter() {
             while csr::cxp::txcore_din_ready_read() == 0 {}
             // println!("{:#04X}", *a);