Maxim Integrated 73M1866B/73M1966B Implementers Guide - Manual (Page 18)

73M1866B/73M1966B Implementer’s Guide UG_1x66B_016
18 Rev. 1.3
4.2 Off-Hook Request
The registers used in the off-hook request procedure are:
0x08
TXDG
-12
TXDG
- 6
TXDG
+3.5
TXDG
+2
TXDG
+1
TXDG
+0.5
TXDG
+0.25
TXDG
+0.125
Write VAL3
0x09
RXDG
-12
RXDG
- 6
RXDG
+3.5
RXDG
+2
RXDG
+1
RXDG
+0.5
RXDG
+0.25
RXDG
+0.125
Write VAL4
0x12 OFH ENDC ENAC ENSHL ENLVD ENFEL ENDT ENNOM
Write X/X/1/X 1/X/X/X X/X/0 or 1/1 X X 1/X/X/X X X/0/X/1
0x13 DCIV1 DCIV0 ILM RSVD PLDM OVDTH IDISPD Res
Write VAL1[1:0] X X X X X X
0x14 TXBST DAA1 DAA0 Res RXBST RLPNH RXG1 RXG0
Write X X X X 0 X X X
0x15 ENOLD DISNTR Res CIDM THEN ENUVD ENOVD ENOID
Write X X 0/X 0/X X/1 X X X
0x16 TXEN RXEN RLPNEN ATEN ACZ3 ACZ2 ACZ1 ACZ0
Write X/1 X/1 X X/1 VAL2[3:0] / X
The temporary variables defined in this procedure are:
VAL1 = System appropriate value for DCIV[1:0].
VAL2 = System appropriate value for ACZ[3:0].
VAL3 = System appropriate value for Tx Gain (RG08).
VAL4 = System appropriate value for Rx Gain (RG09).
Begin
1. Set RXBST = 0 (write xxxx_0xxx to RG14).
2. Set CIDM = 0 (write xx00_xxxx to RG15).
3. Set ENDC = ENFEL =1 (write x1xx_x1xx to RG12).
4. Set DCIV[1:0] = VAL1 (write VAL1[1:0]xx_xxxx to RG13).
5. Set ACZ[3:0] = VAL2 (write xxxx_VAL2[3:0] to RG16).
6. Set THEN = 1 (write xxxx_1xxx to RG15).
7. Set ENNOM = 0 (write xxxx_xxx0 to RG12).
8. Set TXEN = RXEN = ATEN = 1 (write 11x1_xxxx to RG16).
9. Set Rx Gain and Tx Gain as needed. Write VAL3 to RG08, write VAL4 to RG09.
10. Set OFH = 1. If using sieze state, set ENAC =0 else set ENAC =1. (write 1x0x_xxxx or 1x1x_xxxx to
RG12).
11. Wait until line settles (typical maximum is 350 ms).
12. Set ENAC = ENNOM =1 (write xx1x_xxx1 to RG12).
End