Z0220112VEGR4078 Zilog, Z0220112VEGR4078 Datasheet - Page 46

• 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)
Dpctrl
01FA 0H
Default
Value
Function and Explanation
Data Pump Miscellaneous Controls
Do not modify this location during automatic handshake or retrain.
The data pump sets this location to its default value at any reset.
b15 TXSQLCH (Squelch Transmitter: all modes)
b14 AGCFRZ (Freeze Autogain Control: V.22/V.22bis/Bell 212A)
b13 Reserved for Internal Use
b12 Reserved for Internal Use
b10–
11
b9
b8
b4
b3
b2
Set to 1 to freeze AGC adaptation.
Set to 0 when Dpctrl is written by the host.
Set to 0 when Dpctrl is written by the host.
LEQTYPE (Link Equalizer Type) Set LEQTYPE to 0 for a flat
line equalizer, or LEQTYPE to 1 for a 3002 line equalizer.
GTEN (Guard Tone Enable: V.22/V.22bis/Bell 212A)
This bit controls if a V.22/V.22bis/Bell 212A link has a guard
tone or not. If ia guard tone is set, the tone is transmitted along
with the carrier. This bit must not be enabled in modes other
than V.22, V.22bis, and Bell 212A. This bit must be set prior to
selecting the mode in the Config. register.
GTSEL (Guard Tone Select: V.22/V.22bis/Bell212A)
This bit selects the guard tone frequency: 0 is 550 Hz, and 1 is
1800 Hz. This bit must be set prior to selecting the mode in the
Config. register.
EQE (EQMlev > EQMMaxThresh: V.22, V.22bis, BELL
212A)—The data pump sets EQE to 1 when EQMlev exceeds
the threshold set in EQMMaxThresh.
EQFRZ (Freeze Equalizer: all modes)
Set to 1 to freeze adaptive equalizer (AEQ) adaptation. AEQ
coefficients are lost when a mode change (in the Config.
register) occurs.
TSPACE (Select T-spaced vs. T/2-spaced Equalizer)
This bit, when set, selects a T-spaced AEQ. When reset, it
selects a T/2 spaced AEQ. V.22/V.22bis/Bell 212A modes
always use a T/2-spaced equalizer.
V.22BIS Data Pump with Integrated AFE
42