DS21Q58L+ Maxim Integrated Products, DS21Q58L+ Datasheet - Page 39

• Manufacturer Part Number: DS21Q58L+
• Description: IC TXRX E1 QUAD 3.3V 100LQFP
• Manufacturer: Maxim Integrated Products

Specifications of DS21Q58L+

• Function: Transceiver
• Interface: E1
• Number Of Circuits: 4
• Voltage - Supply: 3.14 V ~ 3.47 V
• Current - Supply: 230mA
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Surface Mount
• Package / Case: 100-LQFP
• Includes: AIS Alarms Detector and Generator, Loopback Functions, PRBS Generator / Detector, Remote Detector and Generator
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Power (watts): -

13.
The DS21Q58 can transmit and receive the 2
specifications. The PRBS pattern can be unframed (in all 256 bits of the frame), framed (in all time slots except
TS0), or in any single time slot. Register CCR5 contains the control bits for configuring the transmit and receives
PRBS functions. See
transmit and receive mode 1 operation, the transmit- and receive-channel monitor-select bits of registers CCR3
and CCR4 have an alternate use. When this mode is selected, these bits determine which time slot transmits
and/or receives the PRBS pattern.
SR2.0 indicates when the receiver has synchronized to the PRBS pattern. The PRBS synchronizer remains in sync
until it experiences six or more bit errors within a 64-bit span. Choosing any receive mode other than NORMAL
causes the 16-bit E-bit error counter—EBCR1 and EBCR2—to be reconfigured for counting PRBS errors.
User-definable outputs OUTA or OUTB can be configured to output a pulse for every bit error received. See
Section
during PRBS testing. Once synchronized, any bit errors received cause a positive-going pulse, synchronous with
RCLK.
Table 13-1. Transmit PRBS Mode Select
Table 13-2. Receive PRBS Mode Select
(CCR5.3)
(CCR5.1)
TPRBS1
RPRBS1
0
0
1
1
0
0
1
1
PRBS GENERATION AND DETECTION
20
and
Table 20-1
(CCR5.2)
(CCR5.0)
TPBRS0
RPBRS0
0
1
0
1
0
1
0
1
Table 13-1
for details. This signal can be used with external circuitry to keep track of bit-error rates
Mode 0: Normal (PRBS disabled)
Mode 1: PRBS in TSx. PRBS pattern is transmitted in a single time slot (TS). In this mode, the
transmit-channel monitor-select bits in register CCR3 are used to select a time slot in which to
transmit the PRBS pattern.
Mode 2: PRBS in all but TS0. PRBS pattern is transmitted in time slots 1 through 31.
Mode 3: PRBS unframed. PRBS pattern is transmitted in all time slots.
Mode 0: Normal (PRBS disabled)
Mode 1: PRBS in TSx. PRBS pattern is received in a single time slot (TS). In this mode, the
receive-channel monitor-select bits in register CCR4 are used to select a time slot in which to
receive the PRBS pattern.
Mode 2: PRBS in all but TS0. PRBS pattern is received in time slots 1 through 31.
Mode 3: PRBS unframed. PRBS pattern is received in all time slots.
and
Table 13-2
15
- 1 PRBS pattern. This PRBS pattern complies with ITU-T O.151
for selecting the transmit and receive modes of operation. In
39 of 74
MODE
MODE
DS21Q58 E1 Quad Transceiver