The trace packets for External and AXI4-Master trace output are identical, and conform to the Arm® formatter frame structure as defined in the Arm CoreSight™ Architecture Specification.
There are two packet encodings:
- Default, selected when C_TRACE_PROTOCOL is 0
- Alternate, selected when C_TRACE_PROTOCOL is 1
With the default encoding, the frame ID is used to indicate which MicroBlaze™ processor and MDM core has generated a specific packet. The 8-bit ID is created by concatenating C_JTAG_CHAIN (1-4, 3 bits) with the MicroBlaze processor index (0–31, 5 bits).
The alternate protocol first frame ID (ID A) is set to the value of parameter C_TRACE_ID, and is followed by a single 8-bit value identical to the default protocol frame ID. The alternate protocol second frame ID (ID B) is set to the value of parameter C_TRACE_ID + 1, and is followed by the trace packet data.
Each packet transmits 32 18-bit trace items, and consists of 20 32-bit words, or five frames. The default packet encoding, when C_TRACE_PROTOCOL is 0 is illustrated in the following table and figure. The alternate packet encoding, when C_TRACE_PROTOCOL is 1, is shown in the following table and figure.
| Trace Item | Packet Word (w) and Bits | Trace Item | Packet Word (w) and Bits |
|---|---|---|---|
| 0 | w2[9:8], w0[23:17], w3[25], w0[15:8] | 16 | w12[9:8], w10[15:1], w11[28] |
| 1 | w2[11:10], w1[7:1], w3[26], w0[31:24] | 17 | w12[11:10], w10[31:17], w11[29] |
| 2 | w2[13:12], w1[23:17], w3[27], w1[15:8] | 18 | w12[13:12], w11[15:1], w11[30] |
| 3 | w2[15:14], w2[7:1], w3[28], w1[31:24] | 19 | w12[15:14], w12[7:1], w15[24], w11[23:17], w11[31] |
| 4 | w4[25:24], w2[31:17], w3[29] | 20 | w14[17], w15[29], w12[31:17], w15[25] |
| 5 | w4[27:26], w3[15:1], w3[30] | 21 | w14[19:18], w13[15:1],w15[26] |
| 6 | w4[29:28], w4[7:1], w7[24], w3[23:17], w3[31] | 22 | w14[21:20], w13[31:17], w15[27] |
| 7 | w4[31:30], w4[23:17], w7[25], w4[15:8] | 23 | w14[23:22], w14[15:1], w15[28] |
| 8 | w7[1], w7[30], w5[15:1], w7[26] | 24 | w17[9:8], w15[7:1], w15[30], w14[31:24] |
| 9 | w7[3:2], w5[31:17], w7[27] | 25 | w17[11:10], w15[23:17], w15[31], w15[15:8] |
| 10 | w7[5:4], w6[15:1], w7[28] | 26 | w17[13:12], w16[23:17], w19[25], w16[15:8] |
| 11 | w7[7:6], w6[31:17], w7[29] | 27 | w17[15:14], w17[7:1], w19[26], w16[31:24] |
| 12 | w9[25:24], w7[23:17], w7[31], w7[15:8] | 28 | w19[17], w19[31], w17[31:17], w19[27] |
| 13 | w9[27:26], w8[23:17], w11[25], w8[15:8] | 29 | w19[19:18], w18[15:1], w19[28] |
| 14 | w9[29:28], w9[7:1], w11[26], w8[31:24] | 30 | w19[21:20], w18[31:17], w19[29] |
| 15 | w9[31:30], w9[23:17], w11[27], w9[15:8] | 31 | w19[23:22], w19[15:1], w19[30] |
| Trace Item | Packet Word (w) and Bits | Trace Item | Packet Word (w) and Bits |
|---|---|---|---|
| 0 | w2[25:24], w1[7:1], w3[26], w0[31:24] | 16 | w12[17], w15[25], w11[23:17], w11[29], w10[15:8] |
| 1 | w2[27:26], w1[23:17], w3[27], w1[15:8] | 17 | w12[19:18], w11[7:1], w11[30], w10[31:24] |
| 2 | w2[29:28], w2[7:1], w3[28], w1[31:24] | 18 | w12[21:20], w11[23:17], w11[31], w11[15:8] |
| 3 | w2[31:30], w2[23:17], w3[29], w2[15:8] | 19 | w12[23:22], w12[15:1], w15[24] |
| 4 | w5[9:8], w3[15:1], w3[30] | 20 | w14[25:24], w13[7:1], w15[26], w12[31:24] |
| 5 | w5[11:10], w4[7:1], w7[24], w3[23:17], w3[31] | 21 | w14[27:26], w13[23:17], w15[27], w13[15:8] |
| 6 | w5[13:12], w4[23:17], w7[25], w4[15:8] | 22 | w14[29:28], w14[7:1], w15[28], w13[31:24] |
| 7 | w5[15:14], w5[7:1], w7[26], w4[31:24] | 23 | w14[31:30], w15[29]. w14[15:8] |
| 8 | w7[17], w7[31], w5[31:17], w7[27] | 24 | w17[9:8], w15[15:1], w15[30] |
| 9 | w7[19:18], w5[15:1], w7[28] | 25 | w17[11:10], w16[7:1]. w19[24], w15[23:17], w15[31] |
| 10 | w7[21:20], w6[31:17], w7[29] | 26 | w17[13:12], w16[23:17], w19[25], w16[15:8] |
| 11 | w7[23:22], w7[15:1], w7[30] | 27 | w17[15:14], w17[7:1], w19[26], w16[31:24] |
| 12 | w10[1], w11[28], w8[15:1], w11[24] | 28 | w19[17], w19[31], w17[31:17], w19[27] |
| 13 | w10[3:2], w8[31:17], w11[25] | 29 | w19[19:18], w18[15:1], w19[28] |
| 14 | w10[5:4], w9[15:1], w11[26] | 30 | w19[21:20], w18[31:17], w19[29] |
| 15 | w10[7:6], w9[31:17], w11[27] | 31 | w19[23:22], w19[15:1], w19[30] |
