S/UNI-IMA-4 Telecom Standard Product Data Sheet
Released
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4
3
4
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ꢀ 14 ꢂ NumLines* * Line.Clock.Freq
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0
0
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REFCLK(min)= max
,19.44MHz
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4* REFCLK.Freq
Line.Clock.Freq
3
4
Num.Linesmax
?
ꢂ14 *
0
/
0
13.3.2 Configuring TC layer Options
TC layer options in the transmit direction include scrambling and HEC generations. Scrambling
should be set as required by the physical layer.
TC layer options in the receive direction include descrambling, and interrupt reporting and error
handling options. To properly support IMA applications, the TC layer functions should not
filter out errored cells but pass them to the IMA-LAYER and let the IMA-LAYER filter them
out. The options LCDOCDPASS, HCSPASS and UNASSPASS should be set for IMA
applications.
For TC-only operations, the configuration of HCSPASS has no effect, as all HCS errored cells
will be dropped by the device regardless. LCDOCDPASS must be configured to drop for TC-
only operations in order to ensure cells continue to be dropped when OCD is exited but LCD
has not yet ended. IDLEPASS and UNASSPASS can be programmed according to the desired
application in TC-only operations.
When running IMA, there should never be any idle cells. IDLEPASS must always be set when
running IMA to ensure correct defect event reporting in the absence of all other cells.
The configuration options are programmed one link at a time by following the steps below:
Sꢀ RTTC/TTTC Programming Steps:
o
For each write access, wait until the LBUSY bit in the RTTC/TTTC Indirect Status
Register is clear. Note that the LBUSY bit might not be ready for up to 86 REFCLK
cycle after an access.
o
o
Once the BUSY bit is clear, write to the RTTC/TTTC Link Data Register to specify
the desired configuration options for that link.
Next, write into the RTTC/TTTC Indirect Status register specifying the LINK that is
about to be configured and whether this is to be a write or a read access, by clearing
or setting the LWRB bit in this register.
13.3.3 UTOPIA Interface Configuration
There is very little setup required to configure the Any-PHY/UTOPIA Interface. For typical
operation, the following registers need to be written to select the mode of operation and the
predefined address or address range of the S/UNI-IMA-4 and the number of active ports of the
S/UNI-IMA-4.
Proprietary and Confidential to PMC-Sierra, Inc., and for its customers’ internal use.
Document No.: PMC-2020889, Issue 2
271
PMC [ PMC-SIERRA, INC ]
