Z0220112VEGR4078 Zilog, Z0220112VEGR4078 Datasheet - Page 52

• Manufacturer Part Number: Z0220112VEGR4078
• Description: IC MODEM 2400BPS DSP AFE 44-PLCC
• Manufacturer: Zilog

Specifications of Z0220112VEGR4078

• Data Format: V.21, V.22, V.23, Bell 103, Bell 212A
• Baud Rates: 2.4k
• Interface: Parallel
• Voltage - Supply: 4.5 V ~ 5.5 V
• Mounting Type: Surface Mount
• Package / Case: 44-LCC (J-Lead)
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Table 20. Modem Data Pump Word Definitions (Continued)
PS000904-0107
Register & Address
(hex)
Seq1Count
Biquad A Coefficients
Biquad B Coefficients
DTD0–DTD15
EQMlev
0155–015E
015F–0168
0145–0154
092
18C 95 msec
Default
Value
—
—
—
—
Function and Explanation
Dial Timer On Count
Seq1Count, Seq2Count, and Seq3Count are timer counts in units of
1/9600 of a second, for DTMF and pulse dialing.
For DTMF dialing, Seq1Count is the length of the digit on-time, and
Seq2Count is the length of the digit off-time.
For pulse dialing, Seq1Count is the length of the break period,
Seq2Count is the length of the make period, and Seq3Count is the
length of the pause after dialing a digit.
The data pump sets these locations to their default values when the
host sets Config register, bits 0–6 (MODE) to 3 (dial).
Biquad A and B Coefficients
These locations program the frequency range for the biquad tone
detectors. The coefficients are in the following order:
b2, b1, a3, a2, a1, B2, B1, A3, A2, A1.
See the section on
Detectors on page -54
Tone Detector Coefficients
These locations set the tone detector coefficients for the 16 detectors
in the system. The coefficients are set by using the following formula
where (2 pi x ftone/9600) is measured in radians:
See “Tone Detectors” for more information.
Eye Quality Monitor (EQM)
This register provides a measure of line quality during V.22, V.22bis,
or Bell 212A, while computing a running average of the mean square
error (MSE) of the received point and decision point. When EQMlev
exceeds EQMMaxThresh, Dpctrl.EQE is set to 1; otherwise, it is set
to 0.
coeff
Call-Progress Monitoring Using Biquad Tone
tone
V.22BIS Data Pump with Integrated AFE
for more information.
=
cos
⎛
⎝
2π f
--------------------- -
9600
⋅
tone
⎞
⎠
⋅
32767
48