DS3163 Maxim Integrated Products, DS3163 Datasheet - Page 97
DS3163
Manufacturer Part Number
DS3163
Description
IC TRPL ATM/PACKET PHY 400-PBGA
Manufacturer
Maxim Integrated Products
Datasheet
1.DS3163.pdf
(384 pages)
Specifications of DS3163
Applications
*
Mounting Type
Surface Mount
Package / Case
400-BGA
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
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DS3161/DS3162/DS3163/DS3164
10.2 Clocks
10.2.1 Line Clock Modes
The system loopback (SLB) function does not affect the line clocks in any way.
10.2.1.1 Loop Timing
When loop timing is enabled (PORT.CR3.LOOPT), the transmit clock source is the same as the receive clock
source. The TCLKIn pins are not used as a clock source. Because loop timing is enabled, the loopback functions
(LLB, PLB, and DLB) do not cause the clock sources to switch when they are activated. The transmit and receive
signal pins can be timed to a single clock reference without concern about having the clock source change during
loopbacks.
10.2.1.1.1 Loop Timing Enabled
In this mode, the RLCLKn pins are the source of the clock for both the receive and transmit logic. The RCLKOn,
TCLKOn and TLCLKn clock output pins will both be the same as the RLCLKn clock. The transmit or receive line,
payload and fractional signals can be timed to any of these clock pins. The use of the RLCLKn pin as the timing
source is suggested. If RLCLKn is used as the timing source, be sure to set PORT.CR3.RFTS = 1 for input timing.
10.2.1.1.2 Loop Timing Disabled
When loop timing is disabled, the transmit clock source can be different than the receive clock source. The
loopback functions, LLB, PLB and DLB, will cause the clock sources to switch when they are activated. Care must
be taken when selecting the clock reference for the transmit and receive signals.
The most versatile clocking option has the receive line interface signals timed to RLCLKn, the transmit line
interface signals timed to TLCLKn, the receive framer and fractional signals timed to RCLKOn, and the transmit
framer and fractional signals timed to TCLKOn. This clocking arrangement works in all modes.
When LLB is enabled, the clock on the TLCLKn pins will switch to the clock from the RLCLKn pins. It is
recommended that the transmit line interface signals be timed to the TLCLKn pins. If TLCLKn is used as the timing
source, be sure to set PORT.CR3.TLTS = 0 for output timing.
When PLB is enabled, the TCLKIn pin will not be used and the internal transmit clock is switched to the internal
receive clock. The clock on the TCLKOn pins will switch to the clock from the RLCLKn pins. The framer or
fractional input signals will be ignored while PLB is enabled. It is recommended that the transmit line interface
signals be timed to the TCLKOn pins.
When DLB is enabled, the internal receive clock is switched to the internal transmit clock which is sourced from the
TCLKIn pins or one of the CLAD clocks, and the clock on the RLCLKn pins will not be used. The clock on the
RCLKOn pins will switch to the clock on the TCLKIn pins or one of the CLAD clocks. The receive line signals from
the line interface pins will be ignored. It is recommended that the receive framer and fractional pins be timed to the
RCLKOn pins. If TCLKOn is used as the timing source, be sure to set PORT.CR3.TFTS = 0 for output timing.
When both DLB and LLB are enabled, the TLCLKn clock pins are connected to the RLCLKn clock pins, and the
RCLKOn clock pins will be connected to the TCLKIn clock pins or one of the CLAD clocks. It is recommended that
the transmit line signals be timed to the TLCLKn pins, the receive line interface signals be timed to the RLCLKn
pins, the receive framer and fractional signals be timed to the RCLKOn pins, and the transmit framer and fractional
signals be timed to the TCLKOn pins.
10.2.1.2 CLAD Timing Disabled – no LB
In this mode, the RLCLKn pins source the clock for the receive logic and the TCLKIn pins source the clock for the
transmit logic.
10.2.1.3 CLAD Timing Enabled – no LB
In this mode, the RLCLKn pins source the clock for the receive logic and one of the CLAD clocks sources the clock
for the transmit logic.
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