BT8376EPF datasheet(70/323 Pages) CONEXANT

70 / 323 page

2.0 Circuit Description

Bt8370/8375/8376

2.6 Clock Rate Adapter

Fully Integrated T1/E1 Framer and Line Interface

2-42

Conexant

N8370DSE

JCLK and CLADO are locked to the selected timing reference. The reference

frequency can operate at T1 or E1 line rates, or at any rate supported by the clock

rate adapter. See RSCALE[2:0] [addr 092] to select timing reference frequency.

See Table 2-6 for the JCLK/CLADO timing reference.

CLAD output jitter meets jitter generation requirements of AT&T TR62411,

as listed in Table 2-7.

CLAD modes are selected using the Clock Rate Adapter Configuration

[CSEL; addr 091], and the Clock Rate Adapter Phase Detector Scale Factor

[CPHASE; addr 092].

If the CLAD Phase Detector (CPHASE) is disabled [CEN; addr 090], the

CLAD input timing reference is determined by the JEN and JFREE bits

(addr 002).

If the CLAD Phase Detector is enabled [CEN; addr 090], the CLAD input

timing reference is selected using CLADI[1:0] in the Clock Input Mux register

[CMUX; addr 01A]. The input timing reference can consist of the Clock Rate

Adapter Input Pin (CLADI); the Receive Clock Output (RCKO, prior to the

output buffer); the Transmit Clock Input Pin (TCKI); or the Transmit System Bus

Clock Input Pin (TSBCKI). (See Figures 2-21 and 2-22 for more details.)

Table 2-6. JCLK/CLADO Timing Reference

CEN

JEN

JFREE

JDIR

CLADO/JCLK Reference

REFCKI—Free running 10 MHz clock

REFCKI—Free running 10 MHz clock with transmit JAT

REFCKI—Free running 10 MHz clock with receive JAT

TXCLK—TCKI or ACKI per [AISCLK; addr 068]

RXCLK—RPLL or RCKI per [RDIGI; addr 020]

CLADI—System clock bypass JAT elastic store

CLADI—System clock with transmit JAT

CLADI—System clock with receive JAT

NOTE(S):

1. JCLK always operates at T1 or E1 line rate selected by [T1/E1N; addr 001]

Table 2-7. Jitter Generation Requirements

Filter Applied

Maximum Output Jitter

Measured

None (Broadband)

0.05 UI peak-peak

.015 UI

10 Hz to 40 kHz

0.025 UI peak-peak

.015 UI

8 kHz to 40 kHz

0.025UI peak-peak

.015 UI

10 Hz to 8 kHz

0.02UI peak-peak

.015 UI

BT8376EPF Datasheet(PDF) 70 Page - Synaptics Incorporated.

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