S/UNI-IMA-4 Telecom Standard Product Data Sheet
Released
13.4 IMA_LAYER Configuration
13.4.1 Indirect access to internal memory tables
The IMA-Layer operations are configured by internal memory tables. The access to these tables
is by indirect access. The following procedure applies for the indirect accesses in the RIPP,
RDAT, TIMA, TXIDCC, and RXIDCC blocks.
Write accesses
The indirect write access procedure is as follows:
Sꢀ Wait until the “BUSY” bit in the Block Indirect Memory Access Control Register is clear.
Sꢀ Once the BUSY bit is clear, write to the Block Data Indirect Data Register(s) to specify
the data to be written for that link.
Sꢀ Next, write into the Block Indirect Memory Address register specifying the address that is
about to be configured and then write Block Indirect Memory Command register to
specify the table to be accessed and whether the access is to be a write or a read access,
by clearing or setting the RWB bit in this register. Note that is some instances, the Block
Indirect Memory Address register is combined with the Block Indirect Memory Access
Control Register.
Read Accesses
The indirect read access procedure is as follows:
Sꢀ Wait until the “BUSY” bit in the Block Indirect Memory Access Control Register is clear.
Sꢀ Once the BUSY bit is clear, write into the Block Indirect Memory Address register
specifying the address that is about to be configured and then write Block Indirect
Memory Command register to specify the table to be accessed and whether the access is
to be a write or a read access, by clearing or setting the RWB bit in this register. Note
that is some instances, the Block Indirect Memory Address register is combined with the
Block Indirect Memory Access Control Register.
Sꢀ Poll the “Busy” bit in the Block Indirect Memory Access Control until it is cleared.
Sꢀ Read returned data from the Block Data Indirect Data Register(s).
13.4.2 Configuring Links for Transmission Convergence Operations
After all of the interfaces have been configured, in order to configure a link for ATM over
T1/E1, the mapping from physical link to Any-PHY/UTOPIA address must be set and the link
must be set to TC mode within the IMA sublayer.
Also, all link-based statistics should be cleared.
For TC only links, all RIPP tables are not used and should not be programmed.
Proprietary and Confidential to PMC-Sierra, Inc., and for its customers’ internal use.
Document No.: PMC-2020889, Issue 2
273
PMC [ PMC-SIERRA, INC ]
