Rainbow Electronics AT76C551 - Manual (Page 35)

35
AT76C551
1612D–08/01
• Bit 16 R – TxDataBusy
Set by hardware while TX data is being streamed out
• Bit 15 R – RxDataBusy
Set by hardware while RX data is being streamed in
• Bits 14...13 W – E_funType
Selects the type of E function to be calculated
00: E1 (used for authentication)
01: E21 (used for link key generation)
10: E22 (used for link key generation)
11: E3 (used for encryption key generation)
• Bit 12 R/W – EfunEnblBusy
Set by firmware to start E function calculation
Reset by hardware when calculation is complete
• Bit 11 W – CipherMode
0: No encryption used
1: Packet payload is encrypted in TX and decrypted in RX
• Bits 10..4 W – CorrelThresh
Sliding correlator threshold value, default = 51
Sets sliding correlator sensitivity.
• Bit 3 W– GetFHS_syncword
Set by firmware to start access code recovery from LAP and FHS packet parity bits. Auto-clear
• Bit 2 W – EvalAccCode
Set by firmware to start access code calculation from BD_ADDR only. Auto-clear
• Bit 1 W – AccCodeType
0: Access code TXed (and loaded on sliding correlator) has no trailer bits, thus access code
size is 68 bits.
1: Access code TXed (and loaded on sliding correlator) has trailer bits, thus access code size
is 72 bits.
• Bit 0 W – RxFHS
0: The packet expected to be RXed is not an FHS packet.
1: An FHS packet RX is expected.
Note: Default Value: 00000000 hex
CLKN
addr: 600020 hex R 32 bits
Bits 31..28 – Reserved