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RELEASED
PM73122 AAL1GATOR-32
DATASHEET
PMC-1981419
ISSUE 7
32 LINK CES/DBCES AAL1 SAR PROCESSOR
PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA, INC., AND FOR ITS CUSTOMERS’ INTERNAL USE
388
If DC_EN is disabled and an overrun/underrun condition is reported for a link,
the link should be reset by writing to the tributary control register for the
tributary corresponding to that link. If DC_EN is set, then the tributary will
automatically be reset unless SYNCH_TRIB is set on any Insert tributary.
CLK_MSTR pin TS_EN bits in the SBI_BUS_CFG_REG should be used for
strapping purposes only. If programmability is required, these pins should be
strapped to the non-overriding state and the register equivalents used to
change the Clock Master and the Time Switch Enable states.
INSBI/EXSBI Programming Steps:
1. For each write access, wait until the BUSY bit in the Insert/Extract Tributary
RAM Indirect Access Control Register is clear. Note that the BUSY bit might
not be ready for up to 4.32 us after either a mapping page switch or a Control
RAM or Mapping RAM access.
2. Once the BUSY bit is clear, write to the Insert/Extract Tributary RAM Indirect
Access Address Register specifying the SPE and tributary on the SBI side
that is about to be mapped onto the link side. If the access is to the Mapping
RAM then set bit 7, if the access is to the Control RAM then leave bit 7 clear.
3. If access is to the Mapping RAM, then write into the Extract Tributary
Mapping RAM Indirect Access Data register to specify the SPE and link that
is to be mapped from the SBI side. If access is to the Control RAM, then write
into the Extract Tributary Control RAM Indirect Access Data register to specify
the desired control values for that tributary.
4. Next, write into the Extract Tributary RAM Indirect Access Control register to
specify whether this is to be a write or a read access, by clearing or setting
the WRB bit in this register.
The mapping RAM only needs to be configured if tributary mapping is
enabled (TS_EN=’1’). If tributary mapping is disabled, the default 1:1
mapping is automatically assumed and no mapping RAM configuration is
necessary.
Configuration changes should be done while the tributary is disabled.
Whether tributary mapping is performed or using default 1:1 mapping, the
control RAM needs to be configured for any active tributaries. All tributaries
are initialized to being disabled.