N681622YG Nuvoton Technology Corporation of America, N681622YG Datasheet - Page 30

• Manufacturer Part Number: N681622YG
• Manufacturer: Nuvoton Technology Corporation of America

Specifications of N681622YG

• Lead Free Status / RoHS Status: Supplier Unconfirmed

Setting LAMC:LCDA[0] address (0x43) bit makes the channel automatically enter the Active state from the ON-HOOK
Transmission, Idle, TIP Open, and RING Open states upon Loop Closure Detect. Furthermore, the channel will
transition from Active to Idle state if the Loop Closure Detect circuitry indicates a loop closure is no longer present,
and back to Active state upon a reoccurrence of Loop Closure Detect.
When the above automatic transitions do occur, LS:LS[3:0] address (0x44) will be updated automatically to reflect the
newly entered state. In all cases the shadow linefeed status bits, LS:SLS[3:0] address (0x44) reflect the actual
linefeed status. This includes switching between ‘Ringing’ during the ring burst and ‘ON-HOOK Transmission’ during
the cadence. This RING/cadence transition is not considered an automatic transition and LS:LS[3:0] address (0x44)
will continue to reflect Ringing state. The following example state diagram illustrates LS:SLS[3:0] address (0x44)
states including automatic transitions, RING/Cadence transition and several possible transitions solely governed by
software.
Preliminary Datasheet Rev1.0
LS
LAMC
Register
Any State
Any State
Any State
Any State
Any State
12.1.1.3.3.
SLS[7:4]
LCDA[0]
RGA[1]
LS[3:0]
PAA[2]
Bit(s)
PA_Auto
SW
SW
SW
SW
Table 6: Associated Registers for Linefeed Control
Address
0x44
0x44
0x43
0x43
0x43
SETTING LOOP CLOSURE DETECT AUTOMATIC REACT
Calibration
RING Open
TIP Open
Open
(F/R)
Idle
Figure 7: Example State Diagram
Programmed Linefeed Status
Shadow Linefeed Status
Power Alarm Automatic React
RING Automatic
Loop Closure Detect Automatic React
Page 30 of 164
! LC_Auto
! LC_Auto
LC_Auto
LC_Auto
LC_Auto
LC_Auto
Parameter
Active
(F/R)
RT_Auto
Single Programmable Extended Codec/SLCC
SW
SW
!
!
n = 1, 2
n = 1, 2
LC_Auto = RTLC:LCD = 1 & LAMC:LCDA= 1
LC_Auto = RTLC:LCD = 1 & LAMC:LCDA= 1
RT_Auto = RTLC:RTD = 1 & LAMC:RGA= 1
RT_Auto = RTLC:RTD = 1 & LAMC:RGA= 1
PA_Auto = Power Alarm Event & LAMC:PAA = 1
PA_Auto = Power Alarm Event & LAMC:PAA = 1
LC_Auto = RTLC:LCD= 0
LC_Auto = RTLC:LCD= 0
F/R = Forward / Reverse
F/R = Forward / Reverse
SW
LC_Auto
Ringing
Open
SW
& LAMC:LCDA= 1
& LAMC:LCDA= 1
SW
LS[3:0] = Ringing
Ring Cadence
&
Eleven states
Reflects actual state
Enable/Disable
Enable/Disable
Enable/Disable
Description / Range
Transmission
LFSDS
LFSDS
N681386/87
On Hook
(F/R)
SW
SW
LS[3:0] = Ringing
Ring Burst
&
January 2010