diff --git a/sdk/software/examples/asm/user-sample.c b/sdk/software/examples/asm/user-sample.c
index 129e6a3..4029279 100644
--- a/sdk/software/examples/asm/user-sample.c
+++ b/sdk/software/examples/asm/user-sample.c
@@ -195,6 +195,17 @@ int main(void)
     dma_start_transfer(1, phys_bank_C[(MATMUL_GROUP_NUM - 1) % 2], EXTRAM_PHYS_C(MATMUL_GROUP_NUM - 1), 192, 20);
     dma_wait_polling(1); // 必须等待最后一组写回完成
 
+    /* ── DEBUG: read back specific C elements from ExtRAM ─────── */
+    #define C_WORD(g, elem, part) extram[DST_BASE_WORDS + (g)*48 + (elem)*3 + (part)]
+    printf("DBG g=0 C00=[%08lx %08lx %08lx] C11=[%08lx %08lx %08lx] C23=[%08lx %08lx %08lx]\n",
+        C_WORD(0,0,0),C_WORD(0,0,1),C_WORD(0,0,2),
+        C_WORD(0,5,0),C_WORD(0,5,1),C_WORD(0,5,2),
+        C_WORD(0,11,0),C_WORD(0,11,1),C_WORD(0,11,2));
+    printf("DBG g=1 C00=[%08lx %08lx %08lx] C11=[%08lx %08lx %08lx] C23=[%08lx %08lx %08lx]\n",
+        C_WORD(1,0,0),C_WORD(1,0,1),C_WORD(1,0,2),
+        C_WORD(1,5,0),C_WORD(1,5,1),C_WORD(1,5,2),
+        C_WORD(1,11,0),C_WORD(1,11,1),C_WORD(1,11,2));
+
     /* ── CRC32 over result region ─────────────────────────────── */
     crc = compute_crc32(extram);