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CS61880-IB

Octal E1 Line Interface Unit

Cirrus Logic 

CS61880

SYMBOL

RCLK0

RPOS0/RDATA0

RNEG0/BPV0

TCLK1

TPOS1/TDATA1

TNEG1/UBS1

RCLK1

RPOS1/RDATA1

RNEG1/BPV1

TCLK2

TPOS2/TDATA2

TNEG2/UBS2

LQFP

39

40

41

29

30

31

32

33

34

81

80

79

FBGA

P1

P2

P3

L1

L2

L3

M1

M2

M3

L14

L13

L12

TYPE

O

O

O

I

I

I

O

O

O

I

I

I

DESCRIPTION

Receive Clock Output Port 0

- When MCLK is active, this pin outputs the recovered clock

from the signal input on RTIP and RRING. In the event of

LOS, the RCLK output transitions from the recovered clock

to MCLK.

- If MCLK is held “High”, the clock recovery circuitry is dis-

abled and the RCLK output is driven by the XOR of RNEG

and RPOS.

- If MCLK is held “Low”, this output is in a high-impedance

state.

Receive Positive Pulse/ Receive Data Output Port 0

Receive Negative Pulse/Bipolar Violation Output Port 0

The function of the RPOS/RDATA and RNEG/BPV outputs

are determined by whether Unipolar, Bipolar, or RZ input

mode has been selected. During LOS, the RPOS/RNEG

outputs will remain active.

NOTE: The RPOS/RNEG outputs can be High-Z by holding

MCLK Low.

Bipolar Output Mode - When configured for Bipolar opera-

tion, NRZ Data is recovered from RTIP/RRING and output

on RPOS/RNEG. A high signal on RPOS or RNEG corre-

spond to the receipt of a positive or negative pulse on

RTIP/RRING respectively. The RPOS/RNEG outputs are

valid on the falling or rising edge of RCLK as configured by

CLKE.

Unipolar Output Mode - When unipolar mode is activated,

the recovered data is output on RDATA. The decoder sig-

nals bipolar violations are output on the RNEG/BPV pin.

RZ Output Mode - In this mode, the RPOS/RNEG pins

output RZ data recovered by slicing the signal present on

RTIP/RRING. A positive pulse on RTIP with respect to

RRING generates a logic 1 on RPOS; a positive pulse on

RRING with respect to RTIP generates a logic 1 on RNEG.

The polarity of the output on RPOS/RNEG is selectable us-

ing the CLKE pin. In this mode, external circuitry is used to

recover clock from the received signal.

Transmit Clock Input Port 1

Transmit Positive Pulse/Transmit Data Input Port 1

Transmit Negative Pulse/Unipolar-Bipolar Select Port 1

Receive Clock Output Port 1

Receive Positive Pulse/ Receive Data Output Port 1

Receive Negative Pulse/Bipolar Violation Output Port 1

Transmit Clock Input Port 2

Transmit Positive Pulse/Transmit Data Input Port 2

Transmit Negative Pulse/Unipolar-Bipolar Select Port 2

DS450PP2

17

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