PM7340 S/UNI-IMA-8
PRELIMINARY
INVERSE MULTIPLEXING OVER ATM
DATA SHEET
PMC-2001723
ISSUE 3
INVERSE MULTIPLEXING OVER ATM
Table 7 Context Memory Address Space
Address space
0x000 – 0x03F
0x040 – 0x29F
0x2A0 – 0x2AF
0x2B0 – 0x34F
0x350 – 0x35F
0x360 – 0x3FF
Description
Group context record area.
Reserved
TX link context record area.
Reserved
RX link context record area.
Reserved
MEM_SEL:
The memory select (MEM_SEL) is used to select between the two internal
RAMs. A logic ‘0’ selects the configuration memory, while a logic ‘1’ selects
the context memory.
MEM_RWB:
The memory indirect access control bit (MEM_RWB) selects between a
configure (write) or interrogate (read) access to the RIPP internal context
RAM. Writing a logic 0 to MEM_RWB triggers an indirect write operation. Data
to be written is taken from the RIPP Indirect Memory Data registers. Writing a
logic 1 to MEM_RWB triggers an indirect read operation. The read data can
be found in the RIPP Indirect Channel Data registers
MEM_BUSY:
The memory indirect access status bit (MEM_BUSY) reports the progress of
an indirect access. To trigger an indirect access, MEM_BUSY is set high
when this register is written; it stays high until the access is complete; at that
point, MEM_BUSY is set low. This register should be polled to determine
either: (1) when data from an indirect read operation is available in the
Indirect Data register or (2) when a new indirect write operation may
commence.
PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA, INC., AND FOR ITS CUSTOMERS’ INTERNAL USE
151
PMC [ PMC-SIERRA, INC ]
