Z0220112VEGR3470 Zilog, Z0220112VEGR3470 Datasheet - Page 47

• Manufacturer Part Number: Z0220112VEGR3470
• Description: IC MODEM 2400BPS DSP AFE 44-PLCC
• Manufacturer: Zilog

Specifications of Z0220112VEGR3470

• 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)
MStatus
EQM MaxThresh 01F6 400H
RLSDOffThresh 01F5 –48 dBm Received Line Signal Detect OFF Threshold
RLSDOnThresh
01F
01F4 –43 dBm Received Line Signal Detect ON Threshold
Default
Value
0H
Function and Explanation
Modem Control and Status
b11 RETRAIN (Force a Retrain: V.22bis)
b2
EQM Maximum Threshold
The upper acceptable limit for the Eye Quality Monitor (EQM). During
V.22, V.22bis or Bell 212A data mode, the EQMlev exceeds
EQMMaxThresh, and the data pump sets Dpctrl, bit 4 (EQE) to 1.
The data pump sets this location to its default value at any reset.
Changes in value take effect at the end of the next baud period.
When set, this bit forces a retrain if the data pump has a
V.22bis connection. The CDET (Register 5 bit 1) bit is set to 0
when the retrain begins. The CDET bit is set to 1 when the
retrain is complete. The data pump sets RETRAIN to 0 when
the retrain procedure begins and when the host sets Config
register, bits 0–6
OFFHOOK (Enable Off-Hook Relay)
The data pump sets the OH signal to the inverted value of this
bit. For example, when OFFHOOK is 1, the data pump sets OH
Low. When OH is Low, the off-hook relay closes for the signal
from the telephone line to be presented to the data pump.
The data pump sets OFFHOOK to 1 when the host sets Config
register, bits 0–6 (MODE) to 3 (dial), or to any data mode. The
data pump sets OFFHOOK to 0 at any reset.
Modify OFFHOOK only when Config register, bits 0–6 (MODE)
is set to 0 (STANDBY) to avoid interference with the data
pump’s use of this bit.
V.22BIS Data Pump with Integrated AFE
(
MODE
)
to any data mode.
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