z02201 ZiLOG Semiconductor, z02201 Datasheet - Page 63

• Manufacturer Part Number: z02201
• Description: Z02201 V.22bis Data Pump With Integrated Afe
• Manufacturer: ZiLOG Semiconductor

Manual Handshake Procedures
PS000904-0107
Pulse Dialing
into DTMFh_lev and DTMFl_lev exceeds 30720 (0x7800) the data pump may not
properly transmit the tones.
When transmitting DTMF with a required twist (power difference between high
and low bands), use this formula to determine the maximum DTMF transmit levels
where
DTMF high band (DTMFH_LEV) transmit level in dBm (b is the twist in dBm):
10^(x/20) + 10^((x+b)/20) <= 30720/32768
The values for maximum transmit levels (DTMFl_lev + DTMFh_lev =
common twist values are described in the following table:
Table 26. Maximum Transmit Levels
Pulse dialing is very similar to timed dialing, with the exception that the tone gen-
erated is a cadence of pulses output on the
MSTATUS, bit
timed tone dialing, except:
1. Select pulse instead of tone dial mode by setting location TONESTATUS, bit
2. After setting CONFIG register, bits 0–6 (MODE) to
The V.22bis data pump software allows the host to control every aspect of the
handshake procedure. The host instructs the data pump which signal to send at
which time. The data pump sets status bits when it receives signals from the
remote modem.
DTMFl_lev
14,477
13,599
12,733
(TONEDIAL) to
is always timed.
SEQ2COUNT, and SEQ3COUNT to the required make and break times, pausing
after each digit is dialed. For North American applications requiring a
100 msec cadence, a 39%/61% make/break ratio, and a 0.75 second pause,
set locations SEQ1COUNT to
01C20h
x
is the DTMF low band (DTMFL_LEV) transmit level in dBm, and
.
DTMFh_lev x
16,243
17,121
17,987
2
(OFFHOOK). To implement pulse dialing, follow the instructions for
0
TONESTATUS, bit
-7.10
-7.64
-8.21
024Ah
x+b
-6.10
-5.64
-5.21
, SEQ2COUNT to
V.22BIS Data Pump with Integrated AFE
4
(TIMEDIAL) has no effect. Pulse dialing
OH
b
1
2
3
pin and mirrored in RAM location
3
0176h
(DIAL), set SEQ1COUNT,
, and SEQ3COUNT to
30720
x+b
) at
is the
7
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