DS21Q50L+ Maxim Integrated Products, DS21Q50L+ Datasheet - Page 64

• Manufacturer Part Number: DS21Q50L+
• Description: IC TXRX E1 QUAD 100-LQFP
• Manufacturer: Maxim Integrated Products

Specifications of DS21Q50L+

• 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: *
• 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): -

17.
The DS21Q50 provides a CMI interface for connection to optical transports. This interface is a unipolar
1T2B-coded signal. Ones are alternately encoded as a logical 1 or 0 level for the full duration of the clock
period. Zeros are encoded as a 0-to-1 transition at the middle of the clock period.
example data pattern and its CMI result. The control bit for enabling CMI is in the OUTAC register as
shown below.
Register Name:
Register Description:
Register Address:
Bit
Name
Figure 17-1. CMI Coding
NAME
TTLIE
CMIE
CMII
OA4
OA3
OA2
OA1
OA0
CMI (CODE MARK INVERSION)
TTLIE
7
BIT
7
6
5
4
3
2
1
0
CLOCK
CMII
DATA
TTL Input Enable. When this bit is set, the receiver can accept TTL positive and negative
data at the RTIP and RRING inputs. The data is clocked in on the falling edge of MCLK.
CMI Invert
0 = CMI input data not inverted
1 = CMI input data inverted
Transmit and Receive CMI Enable
0 = Transmit and receive line interface operates in normal AMI/HDB3 mode
1 = Transmit and receive line interface operate in CMI mode. TTIP is CMI output and
RTIP is CMI input. In this mode of operation TRING and RRING are no-connects.
OUTA Control Bit 4. Inverts OUTA output.
OUTA Control Bit 3. See
OUTA Control Bit 2. See
OUTA Control Bit 1. See
OUTA Control Bit 0. See
6
CMI
OUTAC (Reproduced here for clarity)
OUTA Control Register
1A Hex
CMIE
1
5
1
OA4
4
Table 15-1
Table
Table
Table 15-1
0
64 of 87
15-1for details.
15-1for details.
OA3
3
1
for details.
for details.
FUNCTION
0
OA2
2
0
OA1
1
1
OA0
Figure 17-1
0
shows an