CN8380EPF CONEXANT [Conexant Systems, Inc], CN8380EPF Datasheet - Page 50

• 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]

2.0 Circuit Description
2.7 Clock Rate Adapter
2-28
Table 2-11. CLAD Reference Frequencies and Configuration Examples (2 of 2)
applicable. For instance, an alternate configuration for an input reference
frequency of 2048 kHz is displayed in
Table 2-12. Sample Alternate Configuration
reference clock frequency before it is applied to the CLAD’s phase detector.
Similarly, VSCALE scales the CLAD’s internal feedback clock, CLADV . These
two clocks must have the same frequency at the phase detector’s inputs for the
CLAD’s loop to properly lock. So the rule is:
(CLAD reference freq.) ÷ (RSCALE factor) = (CLADV freq.) ÷ (VSCALE factor)
Reference
Reference
To configure the CLAD:
1.
2.
3.
4.
Many RSCALE and VSCALE values other than those shown in
RSCALE is a programmable frequency divider which scales the CLAD
CLAD
CLAD
(kHz)
(kHz)
1536
1280
2560
2048
384
768
160
320
640
20
40
80
Choose a CLADO output frequency. Refer to the CLAD Frequency Select
register [CSEL; addr 03] for a list of all possible CLADO output
frequencies.
Configure OSEL to select the CLADO output frequency.
Select the desired CLAD timing reference frequency from
Configure RSCALE, VSCALE, VSEL from
Advance Information
RSCALE
RSCALE
Conexant
000
000
000
000
000
000
000
000
000
000
000
001
Frequency
Frequency
Compare
Compare
Phase
Phase
(kHz)
(kHz)
1536
1280
2560
1024
384
768
160
320
640
20
40
80
Table
2-12.
VSCALE
VSCALE
010
001
000
111
110
101
100
011
010
001
000
011
Table
Quad T1/E1 Line Interface
2-11.
CLADV
CLADV
(kHz)
(kHz)
1536
1536
1536
2560
2560
2560
2560
2560
2560
2560
2560
8192
Table
Table 2-11
N8380DSA
CN8380
2-11.
VSEL
VSEL
1101
1101
1101
1100
1100
1100
1100
1100
1100
1100
1100
0100
are