z02201 ZiLOG Semiconductor, z02201 Datasheet - Page 54

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

Table 20. Modem Data Pump Word Definitions (Continued)
Transmitting Tones
PS000904-0107
Register & Address
(hex)
DTDStatus
The data pump has two tone generators, each with their own transmit level. The
outputs are mixed together. The frequency of the tones are programmed by writ-
ing coefficients to locations TONEGENA and TONEGENB. The transmit levels are
programmed by writing values to locations DTMF_LEV and DTMFH_LEV. If only
one tone is to be transmitted, the other tone generator’s transmit level is set to
disable it.
00 —
Default
Value
Function and Explanation
This location programs the threshold for all discrete tone detectors.
Any signal whose signal strength is above this threshold turns on the
detection bit for that tone. Any signal below this threshold turns off
the detection bit for that tone. This location can be programmed
using the following formula:
This location must be programmed after Config register, bits 0–6
(MODE) is set to detect tone (02h), because the data pump resets
this location to its default when Config register, bits 0–6 (MODE) is
set to tone detect mode. See “Tone Detectors” for more information.
Discrete Tone Detector Status
This location contains the status of the tone detectors when in tone
detect mode (Config register, bits 0–6 (MODE) is 02h). Bit 0 contains
the status of detector 0, bit 1 (the status of detector 1), and so on.
This location is only valid when in tone detection mode.
The response time of the tone detectors is dependent upon the
frequency of the tone being detected and sampling rate of the data
pump.
When the host sets Config register, bits 0–6 (MODE) to 0
(STANDBY), or resets the data pump, the data pump writes its part
number into this location.
Threshold
V.22BIS Data Pump with Integrated AFE
=
10
(
level
) 20
⁄
⋅
32767
0
to
50