PM7340 S/UNI-IMA-8
PRELIMINARY
INVERSE MULTIPLEXING OVER ATM
DATA SHEET
PMC-2001723
ISSUE 3
INVERSE MULTIPLEXING OVER ATM
12.4.1.2
Read Accesses
The indirect read access procedure is as follows:
1) Wait until the “BUSY” bit in the Block Indirect Memory Access Control
Register is clear.
2) 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 specifiy the table to ba accessed
and whether the access is to be a write or a read access, by clearing or
setting the LWRB 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
3) Poll the “Busy” bit in the Block Indirect Memory Access Control until it is
cleared.
4)Read returned data from the Block Data Indirect Data Register(s).
12.4.2 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.
12.4.2.1
Transmitter
To map the physical link to a ANY-PHY/UTOPIA address, the VPHY address field
must be programmed in the TIMA Physical Link Context Record for the physical
link. All other fields in this table should be cleared to zero. This table may be
accessed by the TIMA Indirect Memory access registers.
To put the physical link into TC mode set the TC_MODE bit in the TXIDCC. This
bit may be accessed by the TXIDCC Indirect Memory Access registers.
PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA, INC., AND FOR ITS CUSTOMERS’ INTERNAL USE
263
PMC [ PMC-SIERRA, INC ]
