BT8375 CONEXANT [Conexant Systems, Inc], BT8375 Datasheet - Page 71

• Manufacturer Part Number: BT8375
• Description: single chip transceivers for T1/E1 and Integrated Service Digital Network (ISDN) primary rate interfaces
• Manufacturer: CONEXANT [Conexant Systems, Inc]

Bt8370/8375/8376
Fully Integrated T1/E1 Framer and Line Interface
2.6.1 Configuring the CLAD Registers
N8370DSE
Step 1
Step 2
Step 3
CLADO and CLADI frequencies. Typically, only 1 selection is needed for a given
system configuration. The processor reconfigures the timing reference [CEN;
addr 090] as needed to respond to system conditions where the primary reference
is unavailable.
Choose a CLADO output frequency.
clock frequencies. For system bus applications, valid CLADO frequencies are
1544 kHz, 1536 kHz, 2048 kHz, 4096 kHz, and 8192 kHz.
Configure OSEL and XSEL from
CLADO output frequency. In some cases, there are two options for generating the
desired output signal. Selecting an option with both T1/E1 and XSEL settings
equal to don’t-care (X in the table) allows greater flexibility in subsequent options
below, and also results in a fixed CLADO frequency when switching framer
operation between T1 and E1 modes.
Table 2-8. CLADO Frequencies Selection
If CLADI is the timing reference source (CEN = 1), select the desired CLAD
timing reference frequency from
RXCLK (line rate), TXCLK (line rate), or free run (REFCKI) and
not applicable.
NOTE(S):
Tables 2-8
X = Don’t care
CLADO (kHz)
12352
16384
1024
2048
4096
8192
2560
1536
1544
3088
6176
and
2-9
Conexant
list examples of program values for selecting various
Table
Table
Table 2-8
T1/E1
2-9. If CEN = 0, the CLAD reference is
X
X
0
X
0
X
0
X
X
1
X
1
1
1
0
X
2-8. OSEL and XSEL together select the
lists all possible CLADO output
OSEL
0
1
7
2
7
3
7
4
6
7
5
7
7
7
7
8
2.0 Circuit Description
2.6 Clock Rate Adapter
Table 2-9
XSEL
X
X
X
X
X
X
X
X
0
1
2
0
1
2
3
3
is
2-43