DS33R41 Maxim Integrated Products, DS33R41 Datasheet - Page 68
DS33R41
Manufacturer Part Number
DS33R41
Description
Network Controller & Processor ICs Inverse-Multiplexing Ethernet Mapper wit
Manufacturer
Maxim Integrated Products
Datasheet
1.DS33R41.pdf
(335 pages)
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10 INTEGRATED T1/E1/J1 TRANSCEIVERS
10.1 T1/E1/J1 Transceiver Clocks
The device contains an on-chip clock synthesizer that generates a user-selectable clock referenced to the
recovered receive clock (RCLK). The synthesizer uses a phase-locked loop to generate low-jitter clocks. Common
applications include generation of port and backplane system clocks.
Figure 10-1
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 10-1. Transceiver Clock Structure
The TCLKT MUX is dependent on the state of the TCSS0 and TCSS1 bits in the TR.CCR1 register and the state of
the TCLKT pin.
RXCLK
TXCLK
TO
LIU
shows the clock map of the transceivers. The routing for the transmit and receive clocks are shown for
MCLKS = 0
RCL = 1
RCL = 0
2.048 TO 1.544
SYNTHESIZER
PRE-SCALER
MCLK
LOCAL
LOOPBACK
LLB = 0
LLB = 1
MCLKS = 1
TR.LIC4.MPS0
TR.LIC4.MPS1
TR.LIC2.3
JITTER ATTENUATOR
SEE TR.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
RLB = 1
RLB = 0
68 of 335
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
TCLKT
MUX
TSYSCLK
8XCLK
BPCLK
RCLKO
TCLKT
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