CS61583 datasheet(27/44 Pages) CIRRUS

27 / 44 page

CODER1, CODER2 : Coder Mode Configuration (PLCC pins 24, 45; TQFP pins 15, 34)

Setting CODER high causes the Coder Mode to be enabled. In Coder Mode, the transmit and

receive data appears in NRZ format on TDATA and RDATA, respectively. These pins also

enable the corresponding AMI pin.

CON01, CON11, CON21, : Configuration Selection

CON02, CON12, CON22 : (PLCC pins 2, 65, 63, 66, 64, 62; TQFP pins 58, 53, 51, 54, 52, 50)

These pins configure the transmitter (pulse shape, pulse width, pulse amplitude, and driver

impedance) receiver (slicing level), and coder (HDB3 vs B8ZS). The CONx1 pins control

channel 1 and the CONx2 pins control channel 2. Both channels must be configured to operate

at the same data rate on the line interface (both T1 or both E1).

LLOOP1, LLOOP2 : Local Loopback (PLCC pins 6, 5; TQFP pins 62, 61)

A local loopback is enabled when LLOOP is high. During local loopback, the TCLK,

TPOS/TNEG (or TDATA) inputs are looped back through the jitter attenuator (if enabled) to the

RCLK, RPOS/RNEG (or RDATA) outputs. The data at TPOS/TNEG continues to be

transmitted to the line interface unless overridden by a TAOS request. The inputs at RTIP and

RRING are ignored.

RESET : Reset (PLCC pin 35; TQFP pin 25)

A device reset is selected by setting the RESET pin high for a minimum of 200 ns. The reset

function initiates on the falling edge of RESET and requires less than 20 ms to complete. The

control logic is initialized and LOS is set high.

RLOOP1, RLOOP2 : Remote Loopback (PLCC pins 7, 37; TQFP pins 63, 27)

A remote loopback is selected when RLOOP is high. The data received from the line interface

at RTIP and RRING is looped back through the jitter attenuator (if enabled) and retransmitted

on TTIP and TRING. Data recovered from RTIP and RRING continues to be transmitted on

RPOS/RNEG (or RDATA). Data input on TPOS/TNEG (or TDATA) is ignored. A TAOS

request overrides the data transmitted at TTIP and TRING.

TAOS1, TAOS2 : Transmit All Ones Select (PLCC pins 4, 3; TQFP pins 60, 59)

Setting TAOS high causes continuous ones to be transmitted at the line interface on TTIP and

TRING at the frequency determined by REFCLK.

Status

AIS1, AIS2 : Alarm Indication Signal (PLCC pins 15, 54; TQFP pins 6, 43)

The AIS indication goes high when the receiver detects 99.9% ones density in a 5.3 ms period

(< 9 zeros in 8192 bits). The AIS indication returns low when the receiver detects

≥ 9 zeros in

8192 bits.

BPV1, BPV2 : Bipolar Violation (PLCC pins 12, 57; TQFP pins 3, 46)

The BPV indication goes high for one RCLK bit period when a bipolar violation is detected in

the received signal. Bipolar violations caused by B8ZS (or HDB3) zero substitutions are not

flagged by the BPV pin if the coder mode is enabled.

CS61583

DS172PP5

CS61583 датащи(PDF) 27 Page - Cirrus Logic