DS21348T+ Maxim Integrated Products, DS21348T+ Datasheet - Page 35

• Manufacturer Part Number: DS21348T+
• Description: IC LIU T1/E1/J1 3.3V 44-TQFP
• Manufacturer: Maxim Integrated Products
• Type: Line Interface Units (LIUs)r

Specifications of DS21348T+

• Number Of Drivers/receivers: 1/1
• Protocol: T1/E1/J1
• Voltage - Supply: 3.135 V ~ 3.465 V
• Mounting Type: Surface Mount
• Package / Case: 44-TQFP, 44-VQFP
• Product: Framer
• Number Of Transceivers: 1
• Supply Voltage (max): 3.465 V
• Supply Voltage (min): 3.135 V
• Supply Current (max): 100 mA
• Maximum Operating Temperature: + 70 C
• Minimum Operating Temperature: 0 C
• Mounting Style: SMD/SMT
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

SYMBOL
ARLBE
ECRS2
ECRS1
ECRS0
CCR6 (05H): COMMON CONTROL REGISTER 6
RJAB
ALB
LLB
RLB
(MSB)
LLB
POSITION DESCRIPTION
CCR6.7
CCR6.6
CCR6.5
CCR6.4
CCR6.3
CCR6.2
CCR6.1
CCR6.0
RLB
Local Loopback. In Local Loopback (LLB), transmit data will be looped back
to the receive path passing through the jitter attenuator if it is enabled. Data in
the transmit path will act as normal. See
details.
0 = loopback disabled
1 = loopback enabled
Remote Loopback. In Remote Loopback (RLB), data output from the
clock/data recovery circuitry will be looped back to the transmit path passing
through the jitter attenuator if it is enabled. Data in the receive path will act as
normal while data presented at TPOS and TNEG will be ignored.
See
0 = loopback disabled
1 = loopback enabled
Automatic Remote Loopback Enable and Reset. When this bit is set high,
the device will automatically go into remote loopback when it detects loop up
code programmed into the Receive Loop-Up Code Definition Registers
(RUPCD1 and RUPCD2) for a minimum of 5 seconds and it will also set the
RIR2.1 status bit. Once in a RLB state, it will remain in this state until it has
detected the loop code programmed into the Receive Loop-Down Code
Definition Registers (RDNCD1 and RDNCD2) for a minimum of 5 seconds at
which point it will force the device out of RLB and clear RIR2.1. The
automatic RLB circuitry can be reset by toggling this bit from a 1 to a 0. The
action of the automatic remote loopback circuitry is logically ORed with the
RLB (CCR6.6) control bit (i.e., either one can cause a RLB to occur).
Analog Loopback. In Analog Loopback (ALB), signals at TTIP and TRING
will be internally connected to RTIP and RRING. The incoming signals, from
the line, at RTIP and RRING will be ignored. The signals at TTIP and TRING
will be transmitted as normal. See
0 = loopback disabled
1 = loopback enabled
RCLK Jitter Attenuator Bypass. This control bit allows the receive recovered
clock and data to bypass the jitter attenuation while still allowing the BPCLK
output to use the jitter attenuator. See
0 = disabled
1 = enabled
Error Count Register Select 2. See Section
Error Count Register Select 1. See Section
Error Count Register Select 0. See Section
ARLBE
Figure 1-1
and Section
ALB
35 of 76
6.2.1
RJAB
for details.
Figure 1-1
Figure 1-1
Figure 1-1
ECRS2
6.4
6.4
6.4
and Section
and Section
for details.
for details.
for details.
and Section
ECRS1
6.2.3
DS21348/DS21Q348
7.3
for more details.
6.2.2
for details.
ECRS0
for
(LSB)