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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
384
the SYNCH_TRIB bit in the Insert Tributary Control Indirect Access
Data register must also be set accordingly.
It is important to note that, in synchronous mode, a tributary must
derive its clocking from the SBI bus. In other words, that tributary
must be configured to be clock slave to the SBI bus by clearing
CLK_MSTR bit in both Extract and Insert Control RAM Indirect
Access Data registers
Tributary Mapping or Disabled
Any tributary can be mapped to any link, unless the tributary is DS3. In
that case the tributary can only be mapped to link 1 or link 17. Note
links numbering starts at ‘1’.
The mapping of links to tributaries is controlled by the Extract/Insert
Tributary Indirect Address Register and Extract/Insert Tributary
Mapping Indirect Address Data Register for that tributary. The SPE
field indicates either the SPE1 or SPE2 and upper or lower 16 links.
The LINK field indicates which link in the group of 16 is mapped to that
tributary.
The TS_EN bit in the SBI Bus Configuration Register
(SBI_BUS_CFG_REG) must be set to globally enable the mapping. If
this bit is set then mapping may occur on a tributary by tributary basis.
If this bit is a zero, which is default value, then the first 16 links are
mapped to the first 16 links of SPE1 and the upper 16 links are
mapped to the first 16 links of SPE2.
There is also a TS_EN bit in the Insert/Extract Control Register,
which operates in a similar fashion. To map individual tributary to a
link, both TS_EN bit on the Extract and on the Insert side must be
set in addition to the global TS_EN bit in the SBI Bus Configuration
Register.
The TRIB_ENBL bit in the Insert/Extract Tributary Control Indirect
Access Data Register for each tributary must be set to enable data to
be extracted or inserted from/to that tributary. On power-up, each
tributary is disabled by default.
The serial clock generated for each link can be disabled by setting the
LINKn_DIS bit in the SBI_LINK_DIS_REGn register for that link. All
clocks default to being active. All serial clocks can also be disabled on
a group of 16 links by setting the CKOUT_KILL bit in the SBI Link
Configuration Register (SBI_LNK_CFG_REG)