MRF24XA_15 Datasheet, PDF (187/258 Pages) Microchip Technology – Low-Power, 2.4 GHz ISM-Band IEEE 802.15.4™ RF

11. Host MCU configures:
- SECSUITE to 0x07
- SECKEY to
0x0F0E0D0C0B0A09080706050403020100,
where LSB (0x00) is at address 0x40
- SECNONCE to
0x08070605040302015555555506, where
MSB (0x08) is at address 0x5c.
12. Host MCU issues RXDEC.
13. MRF24XA performs CCM* de-authentication
and decryption, where the MIC tag is compared
against the received one, and AB E6 is
decrypted to AB AB.
14. MRF24XA asserts RXDECIF (and IDLEIF).
15. —
16. SW read the entire frame from the RX Buffer
(0x300):
3B || C9 55 91 92 93 94 95 96 97 98 01 02 03 04
05 06 07 08 || 5E 18 19 || BA BA AB AB AB 4B
03 7B B7 30 98 B1 E5 93 CA D7 86 81 8A 2D
05 15 AB 5F 6C 7D 5C 70 6C 96 91 C0 34 E5
18 0D || 7B 71 || RSVs
MRF24XA
6.8.8
MAC AND NWK LAYER SECURITY
EXAMPLE 2
• Network Configuration: Address size is 4 bytes,
Inferred destination addressing
• Source address: 0x04030201 where LSB (0x01)
is at address 0x1F
• Destination address: 0x94939291
• Payload: BA BA
• Network header: AB
• Network payload: AB
• Network security level: 0x07
• MAC security level: 0x07
• MAC security indices: Only encode from the sec-
ond payload
• Packet: Data packet
6.8.8.1 Transmission
1. Host MCU constructs the frame and loads the
buffer:
11 || 89 55 91 92 93 94 01 02 03 04 || 3E 10 11
|| BA BA AB AB
2. Host MCU configures:
- SECSUITE to 0x07
- SECKEY to
0x0F0E0D0C0B0A09080706050403020100,
where LSB (0x00) is at address 0x40
- SECNONCE
0x08070605040302015555555506, where
MSB (0x08) is at address 0x5c.
3. Host MCU issues TXENC.
4. MRF24XA configures:
- SECHDRINDX to 0x10
- SECPAYINDX to 0x11
- SECENDINDX to 0x11.
5. MRF24XA performs CCM* authentication with
encryption, where AB AB is encrypted to AB E6,
and the following MIC tag is attached:
AB 4B 03 7B B7 30 98 B1 E5 93 CA D7 86 81
8A 2D
6. MRF24XA asserts TXENCIF (and IDLEIF).
7. Host MCU configures:
- SECSUITE to 0x03
- SECKEY to 0xFFFEFDFCFB-
FAF9F8F7F6F5F4F3F2F1F0, where LSB
(0xF0) is at address 0x40
- SECNONCE
0xF8F7F6F5F4F3F2F15555555506,
where (0xF8) is at address 0x5c.
8. Host MCU issues TXST.
 2015 Microchip Technology Inc.
Preliminary
DS70005023B-page 187