z02201 ZiLOG Semiconductor, z02201 Datasheet - Page 66

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

Making a V.22bis Connection
PS000904-0107
Originating Modem
Answering Modem
9. Set TRNCTRL, bit
10. Set TRNCTRL, bits
11. Set TRNCTRL, bits
12. If in step 6., SB1 is received instead of an S1 signal, set TRNCTRL, bits
In the following example, all timing is performed by the host.
1. Take the telephone line OFF-HOOK and dial.
2. Program the discrete tone detectors and the biquad tone detectors for answer
3. Upon receiving the 2100 Hz answer tone, set CONFIG to
4. When the data pump establishes a V.22bis connection, and is ready to
1. Upon a ring signal or command from the terminal, take the phone off-hook and
2. If required, use the tone generators to transmit a 2100 Hz tone for 2.6–4
3. Set CONFIG register, bits 0–6 (MODE) to
150 msec.
msec.
being transmitted and received at 2400 bps.
(TXCTRL) to 3 (Transmit SB1) for 765 msec. From that point, set TRNCTRL,
bits
received at 1200 bps.
tones (2100 Hz) and call-progress tones (200–600 Hz). Look for the answer
tone and call-progress tones (busy tones, ring back, etc.)
originate). After setting Config, the host should be prepared to receive data
from the remote modem. The data pump holds the received data to marks
(that is, receives nothing) until the modem is able to receive data from the
remote modem.
transmit data to the remote modem, it sets Reg5, bit
now be transmitted or received between the modems.
transmit silence for 1.8–2.5 seconds.
seconds. This tone is the V.25 answer tone.
75 msec.
0
–
2
(TXCTRL) to 5 (1200 bps DATA mode). Data is now transmitted and
3
0
0
(V22BIS) to 1 (force 16-way receive decisions). Wait for
–
–
2
2
(TXCTRL) to
(TXCTRL) to 6 (2400 bps data mode). Data is now
V.22BIS Data Pump with Integrated AFE
4
(transmit SB1 at 2400 bps). Wait for 200
0
(STANDBY) and transmit silence for
1
(CDET) to 1. Data may
4008h
(V.22bis
0
–
2
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