USER MANUAL
TCM 515Z – 2.4 GHZ IEEE 802.15.4 Transceiver
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F-710-017, V1.0
TCM 515Z User Manual | v1.6 | September 2017 | Page 38/46
Appendix C
ESP3 Interface Format
C.1
Packet Type 0x10: IEEE 802.15.4 Raw Packet
In receive mode, TCM 515Z forwards the content of received IEEE 802.15.4 radio telegrams
(which pass frame check sum validation) unmodified to the external host via the ESP3 in-
terface.
The forwarded frame starts with the Length field of the IEEE 802.15.4 PHY Header, contin-
ues with the MAC Header and ends with the last Byte of the MAC Payload. The frame check
sum (MAC Trailer) will not be forwarded to the host.
In transmit mode, TCM 515Z receives from the external host the precomputed message
payload starting with the Length field of the IEEE 802.15.4 PHY Header, continuing with the
MAC Header and ending with the last Byte of the MAC Payload.
TCM 515Z then calculates the frame check sum (MAC Trailer) based on the received pay-
load and appends it to the message. The full frame (including the Preamble and Start of
Frame fields) will then be transmitted as IEEE 802.15.4 radio telegram (TX mode).
C.1.1
ESP3 packet structure for IEEE 802.15.4 Raw Packets
The MAC frame is embedded as 802.15.4 payload into the ESP3 packet as shown in Figure
21 below.
Figure 21: ESP3 packet structure for IEEE 802.15.4 Raw Packets
CRC8D
Header
CRC8H
Optional Data
Sync Byte
802.15.4 Payload
ESP3
Packet
Data Payload
