Maxim Integrated 73M1822/73M1922 Implementers Guide - Manual (Page 20)

73M1822/73M1922 Implementer’s Guide UG_1x22_052
20 Rev. 1.0
5 Off-Hook Procedures
The off-hook procedures described in this section include:
• Barrier Synch Loss
• On-hook Request
• Parallel Pickup Event Detection
5.1 Barrier Synch Loss
When in an off hook state the host must be ready to act in case of a barrier failure. The host should
attempt to put the device in an on-hook state and then reset the PLL and barrier so they can resync.
The on-hook request procedure is described in
Section 5.2 . The procedure for barrier synchronization is
described in Section 3.2.1 .
5.2 On-hook Request
The registers used in the on-hook request procedure are:
0x12 OFH ENDC ENAC ENSHL ENLVD ENFEL ENDT ENNOM
Write 0 0 0 X X X X X
Begin
1. Set ENDC = ENAC = OFH = 0 (write RG12 = 000x_xxxx).
End
5.3 Parallel Pickup Event Detection
To be defined.