CN8380EPF CONEXANT [Conexant Systems, Inc], CN8380EPF Datasheet - Page 56

• Manufacturer Part Number: CN8380EPF
• Description: integrated quad line interface unit unit for both 1.544 Mbps (T1) and 2.048 Mbps (E1) applications
• Manufacturer: CONEXANT [Conexant Systems, Inc]

3.0 Registers
3.2 Global Control and Status Registers
CMUX[2:0]
FREE
RSCALE[2:0]
LFGAIN[3:0]
3-4
02—CLAD Configuration (CLAD_CR)
FREE
7
RSCALE[2]
CLAD Multiplexer Select
phase detector if FREE = 0 [CLAD_CR; addr 02]. The source can be the receive recovered
clock output (RCKO) from any of the four channels or the CLAD input pin.
Free-Run CLAD
numerically controlled oscillator (NCO) to free-run based on the 10 MHz REFCKI input clock
accuracy.
CLAD Reference Scale Factor—Divides CLAD reference signal by 2
CLADR input to the phase detector. Applicable only if FREE is 0. Allows the system to supply
CLADI frequency, up to a maximum of 128 times the desired CLADR reference frequency.
Loop Filter Gain— Selects the NCO loop filter's proportional phase error gain. Lower gain
values reduce phase response time, and higher gain values increase phase response time. Note
that loop instability or acquisition failures may result from incorrectly programmed LFGAIN
values.
000 = CLADI pin
001 = RCKO[1] from channel #1
010 = RCKO[2] from channel #2
011 = RCKO[3] from channel #3
100 = RCKO[4] from channel #4
0 = normal (closed loop) CLAD operation
1 = free run (open loop) NCO operation
6
RSCALE
LFGAIN
000
001
010
011
100
101
110
111
0000
1111
|
RSCALE[1]
—
5
Disables the CLAD phase detector in the CLAD, which forces the
Scale Factor
Proportional Gain
—
128
16
32
64
1
2
4
8
RSCALE[0]
Selects the CLAD reference clock source input to the CLAD
Advance Information
1/2
1/2
4
|
15
0
Conexant
CLADR Reference
CLADR = CLADI
CLADR = CLADI/2
CLADR = CLADI/4
CLADR = CLADI/8
CLADR = CLADI/16
CLADR = CLADI/32
CLADR = CLADI/64
CLADR = CLADI/128
LFGAIN[3]
3
LFGAIN[2]
2
Quad T1/E1 Line Interface
LFGAIN[1]
[RSCALE]
1
to form
N8380DSA
LFGAIN[0]
CN8380
4/21/99
0
R/W