CS61581 データシートの表示（PDF） - Cirrus Logic

部品番号

コンポーネント説明

メーカー

CS61581

T1/E1 Universal Line Interface

Cirrus Logic 

CS61581

2.13 Control Register 1 LH (CR2.0 = 0): Address 0x10

7 (MSB)

TAOS

6

LLOOP

5

RLOOP

4

LB02

3

LB01

2

CODER

TAZ

1

NLOOP

0 (LSB)

LOS

TAOS

LLOOP

RLOOP

LBO[2:1]

CODER

(TAZ)

NLOOP

LOS

Transmit All Ones Select

When TAOS = 1, all ones are transmitted at the TCLK frequency

Local Loopback

When LLOOP = 1, data input at TPOS, TNEG (TDATA) is internally looped back and output on

RPOS, RNEG (RDATA). TCLK is routed to RCLK, through the jitter attenuator, if activated.

Remote Loopback

When RLOOP = 1, clock and data recovered by the receiver are sent back through the transmit

path and retransmitted. The clock and data are routed through the jitter attenuator, if activated.

Line Build Out

LBO2

LBO1

Attenuation

0

0

0 dB

0

1

-7.5 dB

1

0

-15 dB

1

1

-22.5 dB

For E1 long haul, only the 0 dB setting should be used when the part is configured for matched

impedance drive.

Zero Substitution (valid only when TNEG (UBS) is tied high, invoking unipolar mode).

In Long Haul mode, setting CODER to “1” enables B8ZS (HDB3) encoding and decoding.

The substitution depends on whether the CS61581 is configured for T1 or E1 operation. via the

E1_LH bit, CR3.6

Transmit All Zeroes (valid only when TNEG (UBS) is tied low, invoking bipolar mode).

When in bipolar mode (TPOS/TNEG are data inputs) setting TAZ to “1” causes all zeros to be

transmitted.

Network Loopback

NLOOP = 1 when a network loopback code has been detected on the received signal.

An interrupt will occur when NLOOP changes state unless a “1” is written to NLOOP disabling

the interrupt.

Loss Of Signal

LOS = 1 when the loss of signal criteria have been met (175 zeros).

LOS = 0 when a valid signal is being received.

An interrupt will occur when LOS changes state unless a “1” is written to LOS disabling the in-

terrupt.

18

DS211PP8

Share Link: