BT8376EPF datasheet(60/323 Pages) CONEXANT

60 / 323 page

2.0 Circuit Description

Bt8370/8375/8376

2.5 Receive System Bus

Fully Integrated T1/E1 Framer and Line Interface

2-32

Conexant

N8370DSE

2.5 Receive System Bus

The Receive System Bus (RSB) provides a high-speed, serial interface between

the RCVR and the system bus. The system bus is compatible with the Mitel

ST-Bus, the Siemens PEB Bus, and the AT&T CHI Bus, and directly connects to

other CONEXANT serial TDM bus devices with no need for any external

circuitry.

The RSB has the following seven pins: Receive System Bus Clock (RSBCKI),

Receive PCM Data (RPCMO), Receive Signaling Data (RSIGO), Receive Frame

Sync (RFSYNC), Receive Multiframe Sync (RMSYNC), Receive Time Slot

Indicator (RINDO), and Signaling Freeze (SIGFRZ). Figure 2-15 illustrates the

relationship between these signals. (Pin definitions are provided in

Table 1-1, Hardware Signal Definitions.) RSB data outputs can be configured to

output on the rising or falling edge of RSBCKI. See the Receive System Bus

Configuration register [RSB_CR; addr 0D1].

Figure 2-15. RSB Waveforms

NOTE(S):

The Receive Multiframe Sync (RMSYNC) occurs every 6 ms for 48 T1 or 48 E1 frames.

RSBCKI

RPCMO

RINDO

RSIGO

RPCMO

RINDO

RSIGO

SIGFRZ

RFSYNC

RMSYNC

Frame 48 TS 31

Frame 1 TS 0

Frame 48 TS 24

Frame 1 TS 1

BT8376EPF Datasheet(PDF) 60 Page - Synaptics Incorporated.