DS21Q55 Maxim Integrated Products, DS21Q55 Datasheet - Page 49

IC TXRX QUAD T1/E1/J1 SCT 256BGA

DS21Q55

Manufacturer Part Number
DS21Q55
Description
IC TXRX QUAD T1/E1/J1 SCT 256BGA
Manufacturer
Maxim Integrated Products
Datasheet

Specifications of DS21Q55

Function
Transceiver
Interface
E1, J1, T1
Number Of Circuits
4
Voltage - Supply
3.14 V ~ 3.47 V
Current - Supply
75mA
Operating Temperature
0°C ~ 70°C
Mounting Type
Surface Mount
Package / Case
256-BGA
Includes
BERT Generator and Detector, Dual HDLC Controllers
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Power (watts)
-

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6. CLOCK MAP
Figure 6-1 shows the clock map of the DS21Q55. The routing for the transmit and receive clocks are
shown for the various loopback modes and jitter attenuator positions. Although there is only one jitter
attenuator, which can be placed in the receive or transmit path, two are shown for simplification and
clarity.
Figure 6-1. Clock Map
The TCLK MUX is dependent on the state of the TCSS0 and TCSS1 bits in the LIC1 register and the
state of the TCLK pin.
TCSS1
RXCLK
TXCLK
TO
LIU
0
0
1
1
MCLKS = 0
RCL = 1
RCL = 0
TCSS0
2.048 TO 1.544
SYNTHESIZER
PRE-SCALER
MCLK
0
1
0
1
LOCAL
LOOPBACK
LLB = 0
LLB = 1
MCLKS = 1
The TCLK pin (C) is always the source of transmit clock.
Switch to the recovered clock (B) when the signal at the TCLK pin
fails to transition after one channel time.
Use the scaled signal (A) derived from MCLK as the transmit clock.
The TCLK pin is ignored.
Use the recovered clock (B) as the transmit clock. The TCLK pin is
ignored.
LIC4.MPS0
LIC4.MPS1
LIC2.3
JITTER ATTENUATOR
SEE LIC1 REGISTER
JAS = 0
OR
DJA = 1
JAS = 1
AND
DJA = 0
LTCA
LTCA
JAS = 0
AND
DJA = 0
JAS = 1
OR
DJA = 1
REMOTE
LOOPBACK
Transmit Clock Source
RLB = 1
RLB = 0
49 of 237
DJA = 1
DJA = 0
FRAMER
LOOPBACK
FLB = 0
FLB = 1
TRANSMIT
FORMATTER
RECEIVE
FRAMER
8 x PLL
PAYLOAD
LOOPBACK
(SEE NOTES)
PLB = 1
PLB = 0
A
B
BPCLK
SYNTH
C
TCLK
MUX
TSYSCLK
8XCLK
BPCLK
RCLK
TCLK

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