stlc3040 STMicroelectronics, stlc3040 Datasheet - Page 20

• Manufacturer Part Number: stlc3040
• Description: Subscriber Line Interface Codec Filter, Cofislic
• Manufacturer: STMicroelectronics

STLC3040
Figure 9.
DUP3-DUP0 Persistence check for signalling up-
stream Off-Hook and I1.
will be transmitted upstream, after it has been sta-
ble for from (N-1) to N millisecond (see fig. 9).
N is programmable in range of 1 to 15 ms in steps
of 1 ms. DUP3-DUP0 = 0000 means no persist-
ence check.
DUB3-DUB0 Persistence check for signalling up-
stream Ground-Key. New status information will
be transmitted upstream, after it has been stable
for N millisecond. N is programmable in range
from 0 to 60 ms in steps of 4 ms. DUB3-DUB0 =
0000 means no persistence check.
CR4 enables internal filters B, Z, X, R, GX/GR. It
also programs the Loop Back and sets the codifi-
cation law: A-law or -law.
Reset value: F9h
B represents B-filter
Z represents Z-filter
X represents X-filter
20/49
BIT7 BIT6 BIT5 BIT4
B
= 0 B-filter is Off, Related Transfer Function
= 0 Z-filter is Off, Related Transfer Function is
= 1 Z-filter is On, Related Transfer Function
= 0 X-filter is Off, Related Transfer Function
= 1 X-filter is On, Related Transfer Function
= 1 B-filter is On, Related Transfer Function
(HB) is defined by programmed filter
coefficients (COP command)
(HX = 1) is one
is zero (HB = 0)
zero (HZ = 0)
(HZ) is defined by programmed filter
coefficients (COP command)
Z
X
R
I1 AFTER PERSISTENCE
I1 AFTER PERSISTENCE
CHECK ON UPSTREAM
CHECK ON UPSTREAM
GX/GR LOOP1 LOOP0 A/U
BIT3
I1
I1
New status information
BIT2
BIT1
0
0
BIT0
R represents R-filter
GX/GR represents GX/GR-filter
LOOP1-LOOP0 select the loop back (see Block
Diagram fig. 3 and paragraph 4.42)
A/U chooses coding law
CR5 sets ring-trip thresholds and test modes
Reset value: 60h.
RTV3-RTV0 set Ring-Trip Threshold Value. This
value is programmable in the range from 9.6/16
mA to 9.6 mA in steps of 9.6/16 mA.
RTV3 RTV2 RTV1 RTV0
BIT7 BIT6 BIT5 BIT4
= 0 R-filter is Off, Related Transfer Function
= 1 R-filter is On, Related Transfer Function
= 0 GX/GR-filter is Off, Related Transfer
= 1 GX/GR-filter is On, Related Transfer
= 0 -law coding
= 1 A-law coding
N-1ms
= 00 No loop-Back
= 01 Loop-Back only GCI interface (LB1 on).
= 10 Loop-Back the digital part (Digital
= 11 Loop-Back the Analog part (Analog
N-1
(HX) is defined by programmed filter
coefficients (COP command)
(HR) is defined by programmed filter
(HR = 1) is one
coefficients (COP command)
Function (HGX/GR = 1) is one
Function (HGX/GR) is defined by
programmed filter coefficients
(COP command)
Sigma-Delta converter is included, LB2 on).
Sigma-Delta converter is included, LB3 on).
N
Nms
TESM3 TESM2 TESM1 TESM0
BIT3
D96TL264
BIT2
BIT1
BIT0