BT8376EPF datasheet(71/323 Pages) CONEXANT

71 / 323 page

Bt8370/8375/8376

2.0 Circuit Description

Fully Integrated T1/E1 Framer and Line Interface

2.6 Clock Rate Adapter

N8370DSE

Conexant

2-43

Tables 2-8 and 2-9 list examples of program values for selecting various

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.

2.6.1 Configuring the CLAD Registers

Step 1

Choose a CLADO output frequency. Table 2-8 lists all possible CLADO output

clock frequencies. For system bus applications, valid CLADO frequencies are

1544 kHz, 1536 kHz, 2048 kHz, 4096 kHz, and 8192 kHz.

Step 2

Configure OSEL and XSEL from Table 2-8. OSEL and XSEL together select the

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.

Step 3

If CLADI is the timing reference source (CEN = 1), select the desired CLAD

timing reference frequency from Table 2-9. If CEN = 0, the CLAD reference is

RXCLK (line rate), TXCLK (line rate), or free run (REFCKI) and Table 2-9 is

not applicable.

Table 2-8. CLADO Frequencies Selection

CLADO (kHz)

T1/E1

OSEL

XSEL

1024

2048

4096

8192

2560

1536

1544

3088

6176

12352

16384

NOTE(S):

X = Don’t care

BT8376EPF Datasheet(PDF) 71 Page - Synaptics Incorporated.

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