S/UNI-IMA-4 Telecom Standard Product Data Sheet
Released
Attribute
UTOPIA L2
Any-PHY
Autonomous
Not supported. A subsequent cell is
output (provided one is available) if
RENB is held low beyond the end of a
cell.
The outputs become high impedance
after the last word of a cell is
transferred and until the S/UNI-IMA-4
is reselected.
deselection
Receive Cell Transfer Format
The cell format for the receive direction is the same as the transmit interface; see Figure 8 and
Figure 9 for the formats.
Figure 8 16-bit Receive Cell Transfer Format
Bits 15-8
Bits 7-0
Address Prepend
Word 0
(Any-PHY and
single channel
UL2 only*)
Optional Prepend
Word 1
(Optional)
H1
H2
H4
Word 2
Word 3
Word 4*
Word 5
Word 6
H3
HEC/UDF
PAYLOAD1
PAYLOAD3
PAYLOAD2
PAYLOAD4
S
S
S
S
S
S
PAYLOAD47
PAYLOAD48
Word 28
Note:
Sꢀ Address prepend for Single Channel UL2 may be inserted in HEC/UDF field instead of prior to the
cell.
Proprietary and Confidential to PMC-Sierra, Inc., and for its customers’ internal use.
Document No.: PMC-2020889, Issue 2
49
PMC [ PMC-SIERRA, INC ]
