PM7340 S/UNI-IMA-8
PRELIMINARY
INVERSE MULTIPLEXING OVER ATM
DATA SHEET
PMC-2001723
ISSUE 3
INVERSE MULTIPLEXING OVER ATM
12.4.2.2
Receiver
To map the physical link to an Any-PHY/UTOPIA address, the VPHY address
field must be programmed in the RDAT TC Context Record for the physical link.
All other fields in this table should be cleared to zero. This table may be
accessed by the RDAT Indirect Memory access registers.
The RDAT Link Statistics Record, the RDAT TC Group Statistics Record, the
RDAT Link Context Memory should also be cleared to zero to reset the statistic
counts. The RDAT Validation memory should be set to TC_MODE
To put the physical link into TC mode, set the TC_MODE bit in the RXIDCC. This
bit may be accessed by the RXIDCC Indirect Memory Access registers.
Ensure that the RDAT_EN bit in the RDAT CONFIGURATION register is set.
12.4.3
Configuring For IMA Operations
All IMA timeouts are programmable. In general, the default values result in ~1
sec timeouts with a 55 MHz SYSCLK.
The global IMA interrupt enables default to disabled. In an interrupt driven
system, these interrupt should be selectively enabled in registers 0x218, 0x21A,
and 0x21C.
RIPP_EN in Register –x200 controls whether internal IMA state machines engine
is enabled. This must be set for proper operation.
IMA groups are configured using the following per group tables:
• RIPP Group Configuration Record: Group options and configuration,
• TX LID to Link Mapping Table: maps Group Tag/LID to physical Link.
• TIMA TX Group Configuration Record: maps group to Any-PHY/UTOPIA
port ID, sets stuffing mode and OAM label.
• RDAT IMA Group Context Record: maps group to Any-PHY/UTOPIA port ID
and also the following per link tables:
• RIPP TX Link Configuration Record: maps physical Link to Group Tag/LID,
enables TX Link Interrupts.
PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA, INC., AND FOR ITS CUSTOMERS’ INTERNAL USE
264
PMC [ PMC-SIERRA, INC ]
