BT8376EPF datasheet(61/323 Pages) CONEXANT

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Bt8370/8375/8376

2.0 Circuit Description

Fully Integrated T1/E1 Framer and Line Interface

2.5 Receive System Bus

N8370DSE

Conexant

2-33

The RSB supports five system bus rates (MHz): 1.536, 1.544, 2.048, 4.096,

and 8.192. The T1 rate without a framing bit is 1.536 MHz, consisting of 24 time

slots. The T1 rate with a framing bit 1.544 MHz. The E1 rate is 2.048 MHz,

consisting of 32 time slots. Twice the E1 rate is 4.096 MHz, consisting of 64 time

slots. Four times the E1 rate is 8.192 MHz, consisting of 128 time slots. The

4.096 and 8.192 MHz bus modes contain multiple bus members (A, B, C, D)

which allow multiple T1/E1 signals to share the same system bus. This is done by

interleaving the time slots to a maximum of four Bt8370s without external

circuitry (see Figures 2-15 and 2-17). The system bus rate is independent of the

line rate and must be selected using the System Bus Interface Configuration

Figure 2-16. RSB 4.096 MHz Bus Mode Time Slot Interleaving

NOTE(S):

A and B time slot data comes from different Bt8370s. Output data on rising edge clock, RCPM_NEG = 0 [addr 0D1].

Output sync on rising edge clock, RSYN_NEG = 0 [addr 0D1]. RSBCKI operates at 1 times the data rate. RSB.OFFSET

equals 0.

RSBCKI

TS31A

TS31B

TS0A

TS0B

RPCMO

RFSYNC

SIG31A

SIG31B

SIG0A

SIG0B

RSIGO

Figure 2-17. RSB 8.192 MHz Bus Mode Time Slot Interleaving

NOTE(S):

A, B, C, and D data comes from different Bt8370s. Output data on rising edge clock, RCPM_NEG = 0 [addr 0D1].

Output sync on rising edge clock, RSYN_NEG = 0 [addr 0D1]. RSBCKI operates at 1 times the data rate. RSB.OFFSET

equals 0.

SIG31A

SIG31B

SIG31C

SIG31D

SIG0A

SIG0B

SIG0C

SIG0D

RSBCKI

RSIGO

RFSYNC

TS31A

TS31B

TS31C

TS31D

TS0A

TS0B

TS0C

TS0D

RPCMO

BT8376EPF 数据表(PDF) 61 Page - Synaptics Incorporated.

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