DS3172 Maxim Integrated, DS3172 Datasheet - Page 60
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DS3172
Manufacturer Part Number
DS3172
Description
Network Controller & Processor ICs Dual DS3/E3 Single Chip Transceiver
Manufacturer
Maxim Integrated
Datasheet
1.DS3171.pdf
(234 pages)
Specifications of DS3172
Part # Aliases
90-31720-000
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10.2.5 Gapped Clocks
The transmit and receive output clocks can be gapped in certain configurations. See
for the configuration settings. The gapped clocks are active during DS3 or E3 framed payload bits overhead bits
depending on which mode the device is configured for.
In the internal DS3 or E3 frame modes, the transmit gapped clock is created by the logical OR of the TCLKOn and
TDENn signals creating a positive or negative clock edge for each payload bit, the receive gapped clock is created
by the logical OR of the RCLKOn and RDENn signals.
When the output clock is disabled, the gapped output signal is high during clock periods if the pin is not inverted,
otherwise it will be low.
The gapped clocks are very useful when the data being clocked does not need to be aligned with any frame
structure. The data is simply clocked one bit at a time as a continuous data stream.
10.3 Reset and Power-Down
The device can be reset at a global level via the GL.CR1.RST bit or the RST pin and at the port level via the
PORT.CR1.RST bit and each port can be explicitly powered down via the PORT.CR1.PD bit. The JTAG logic is
reset using the power on reset signal from one of the LIUs as well as from the JTRST pin.
Figure 10-4. Example IO Pin Clock Muxing
TSER
TCLKI
RLCLK
CLAD CLOCKS
STS-1 CLK
RX LIU CLK
DS3 CLK
E3 CLK
PIN INVERT
PIN INVERT
PIN INVERT
DELAY
TFTS
0
1
CLOCK TREE
CLOCK TREE
CLOCK TREE
INTERNAL
INTERNAL
INTERNAL
SIGNAL
SIGNAL
SIGNAL
D
SET
CLR
Q
Q
60
D
D
D
D
SET
CLR
SET
CLR
SET
CLR
SET
CLR
Q
Q
Q
Q
Q
Q
Q
Q
INTERNAL
DELAY
SIGNAL
DELAY
DELAY
TFTS
TLTS
RFTS
0
1
0
1
0
1
D
D
D
SET
CLR
SET
CLR
SET
CLR
Q
Q
Q
Q
Q
Q
PIN INVERT
PIN INVERT
PIN INVERT
PIN INVERT
PIN INVERT
PIN INVERT
Table 10-22
RCLKO
TCLKO
TLCLK
TDEN
RSER
TPOS
and
Table 10-24
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