S/UNI-IMA-4 Telecom Standard Product Data Sheet
Released
In Any-PHY mode, the cell transfer is initiated after a successful poll. The virtual PHY address
is prepended to the cell, thus performing an inband selection. The S/UNI-IMA-4 monitors the
address prepend on the cell transfer to detect its cells.
For Any-PHY mode, if a second TSX is asserted prior to a complete cell being transferred, the
cell transfer error interrupt will be triggered. This indicates that a runt cell has been transferred
to the S/UNI-IMA-4; this is an Any-PHY protocol violation. Also this interrupt signal will be
triggered if the TENB is deasserted prior to a complete cell is transferred since pausing is not
supported in Any-PHY mode.
Transmit Cell Transfer Format
The Transmit Cell Transfer Format is shown in Figure 6 and Figure 7. Word/byte 0 is required
for cell transfers to an Any-PHY slave. The address prepend is the S/UNI-IMA-4 virtual PHY
ID. The virtual PHY ID can be mapped to a TC link or to an IMA group. Optional prepends are
supported, but are ignored by the S/UNI-IMA-4.
Inclusion of optional words is statically configurable for the interface. The optional words are
always ignored.
Figure 6 16-bit Transmit Cell Transfer Format
Bits 15-8
Bits 7-0
Address Prepend
Word 0
(Any-PHY
only)
Optional Prepend
Word 1
(Optional)
H1
H2
H4
Word 2
Word 3
H3
HEC/UDF
Word 4
Word 5
Word 6
PAYLOAD1
PAYLOAD3
PAYLOAD2
PAYLOAD4
S
S
S
S
S
S
PAYLOAD47
PAYLOAD48
Word 28
Proprietary and Confidential to PMC-Sierra, Inc., and for its customers’ internal use.
Document No.: PMC-2020889, Issue 2
46
PMC [ PMC-SIERRA, INC ]
