PM7340 S/UNI-IMA-8
PRELIMINARY
INVERSE MULTIPLEXING OVER ATM
DATA SHEET
PMC-2001723
ISSUE 3
INVERSE MULTIPLEXING OVER ATM
Figure 6
- 8-bit Transmit Cell Transfer Format
Bits 7-0
Byte 0
Address Prepend
(Any-PHY
only)
Byte 1
Optional Prepend[15:8]
Optional Prepend[7:0]
(Optional)
Byte 2
(Optional)
Byte 3
Byte 4
Byte 5
Byte 6
Byte 7*
H1
H2
H3
H4
HEC
Byte 8
PAYLOAD1
•
•
•
Byte 55
PAYLOAD48
10.1.2 Receive Any-PHY/UTOPIA Slave (RXAPS)
In the receive direction, each S/UNI-IMA-8 transmits cells on an Any-
PHY/UTOPIA L2 compatible interface operating at clock rates up to 52 MHz and
supporting 16-bit and 8-bit wide data structures. The S/UNI-IMA-8 operates as a
bus slave.
In the 8 and 16-bit UTOPIA Level 2 Multi-Address Slave mode, the S/UNI-IMA-8
operates as an 8 port multi-PHY with each virtual PHY stored in it’s own FIFO. A
4-bit configuration register, RCAEN, controls the response to polling the
PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA, INC., AND FOR ITS CUSTOMERS’ INTERNAL USE
44
PMC [ PMC-SIERRA, INC ]
