BT8376EPF datasheet(235/323 Pages) CONEXANT

235 / 323 page

Bt8370/8375/8376

Fully Integrated T1/E1 Framer and Line Interface

3.17 System Bus Registers

N8370DSE

Conexant

3-117

0D4—Transmit System Bus Configuration (TSB_CR)

BUS_TSB

Enable Bussed TSB Output—Applicable only if system bus outputs are controlled by SBI

timebases [SBI_OE = 1; addr 0D0]. When BUS_TSB is active, TINDO outputs from multiple

devices are allowed to share a common transmit system bus connection. Unused time slots are

three-stated during bus groups not selected by SBI mode [addr 0D0]; otherwise, unused time

slots repeat their TINDO value for all bus groups.

0 = TINDO repeated for all bus groups

1 = three-state TINDO during unused time slots

TX_ALIGN

Transmitter Output Multiframe Aligns to TSB Timebase—Allows multiframe alignment

located at TSB (from TMSYNC or TFRAMER) to pass across TSLIP buffer and force the

corresponding multiframe alignment onto the transmitter timebase. Used primarily to pass

TMSYNC from system bus.

0 = Transmitter multiframe does not follow TSB

1 = Transmitter multiframe follows TSB multiframe

TPCM_NEG

Output Data on Falling Edge Clock—Selects TSBCKI rising or falling edge clock signal to

output TINDO and the opposite TSBCKI edge to sample TPCMI and TSIGI inputs.

0 = TINDO rising edge output (TPCMI and TSIGI falling edge inputs)

1 = TINDO falling edge outputs (TPCMI and TSIGI rising edge inputs)

8192 kbps SBI Mode

OFFSET[9:5]

OFFSET[4:3]

RSYNC Time Slot

Group

00000

00001

11110

11111

NOTE(S):

Offsets outside the RSB timebase range result in no pulses on RFSYNC and

RMSYNC outputs.

BUS_TSB

TX_ALIGN

TPCM_NEG

TSYN_NEG

TSB_ALIGN

TSB_CTR

TSBI[1]

TSBI[0]

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