CMX868E2 View Datasheet(PDF) - MX-COM Inc
Part Name
Description
MFG CO.
'CMX868E2' PDF : 43 Pages View PDF
Low Power V.22bis Modem
29
CMX868 Advance Information
1.E-03
1.E-04
BER
1.E-05
1.E-06
0
1
2
3
4
5
6
7
Rx Status Register BER reading
Figure 19: Typical Rx BER vs. Average Status Register BER Reading (b2-0)
4.10.8 Programming Register
Programming Register : 16-bit write-only. C-BUS address $E8
This register is used to program the transmit and receive programmed tone pairs by writing appropriate
values to RAM locations within the CMX868. Note that these RAM locations are cleared by Powersave or
Reset.
The Programming Register should only be written to when the Programming Flag bit (b13) of the Status
Register is 1. The act of writing to the Programming Register clears the Programming Flag bit. When the
programming action has been completed (normally within 150Ps) the CMX868 will set the bit back to 1.
When programming Transmit or Receive Tone Pairs, do not change the Transmit or Receive Mode Registers
until programming is complete and the Programming Flag bit has returned to 1.
Transmit Tone Pair Programming
4 transmit tone pairs (TA to TD) can be programmed.
The frequency (max 3.4kHz) and level must be entered for each tone to be used.
Single tones are programmed by setting both level and frequency values to zero for one of the pair.
Programming is done by writing a sequence of up to seventeen 16-bit words to the Programming Register.
The first word should be 32768 (8000 hex), the following 16-bit words set the frequencies and levels and are
in the range 0 to 16383 (0-3FFF hex)
Word
1
2
3
4
5
6
7
---
---
16
17
Tone Pair
TA
TA
TA
TA
TB
TB
---
---
TD
TD
Value written
32768
Tone 1 frequency
Tone 1 level
Tone 2 frequency
Tone 2 level
Tone 1 frequency
Tone 1 level
----------
----------
Tone 2 frequency
Tone 2 level
¤2001 MX-COM, Inc.
www.mxcom.com tel: 800 638 5577 336 744 5050 fax: 336 744 5054
Doc. # 20480205.007
4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA
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