RELEASED
PM7350 S/UNI DUPLEX
DATA SHEET
PMC-1980581
ISSUE 8
DUAL SERIAL LINK PHY MULTIPLEXER
The SCI-PHY/Any-PHY Input Configuration 1 register (0x0C) determines the cell
format of the input bus. A SCI-PHY/Utopia input bus slave neither requires nor
supports embedded PHY ID. The cell length options for the 8 bit bus (shown in
Fig. 6) are described in Table 6. 16 bit bus options (shown in Fig. 7) are
described in Table 7. Note that these options are identical to the SCI-PHY/Utopia
input bus master configuration.
Table 6 Eight Bit SCI-PHY/Utopia Bus Slave, Input Configuration
Byte
Register 0x0C
H5UDF PRELEN
Notes
H1-H4, no H5 byte
#
bytes
52
53
53
54
54
55
0
1
2
7
N
N
N
N
N
N
N
N
Y
Y
Y
Y
N
N
N
N
Y
Y
N
Y
N
Y
N
Y
0
1
0
1
0
1
00
00
01
01
10
10
Default, Utopia compatible
1 user byte then H1-H4
1 user byte then H1-H5
2 user bytes then H1-H4
2 user bytes then H1-H5
Table 7 Sixteen Bit SCI-PHY/Utopia Bus Slave, Input Configuration
Word
Register 0x0C
H5UDF PRELEN
Notes
H1-H4, no H5/UDF field
#
bytes
52
54
54
0
1
4
N
N
N
N
N
N
Y
Y
N
Y
N
Y
0
1
0
1
00
00
01
01
Default, Utopia compatible
1 user word then H1-H4
56
1 user word, H1-H4, then H5/UDF
In the egress direction (cells are transferred from the LVDS to the output port),
the port appears as a single addressable SCI-PHY/Utopia Level 2 slave. The
cells received on the high-speed serial link are queued in FIFOs dedicated to
each logical channel. The corresponding PHY ID of each cell is encoded in
system prepend bytes sent over the LVDS link. The S/UNI-DUPLEX
autonomously multiplexes the traffic from up to 32 logical channels and presents
it as a single cell stream on the output bus. If at least one cell is present in any of
the FIFOs, OCA will drive high when the device is polled.
Polling occurs when OAVALID is sampled high and the sampled OADDR[4:0]
matches the OAD[4:0] bits in the Output Address Match register. Utopia L2
compatibility is achieved if OAVALID is tied high and OAD[4:0] is not all ones.
PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA, INC., AND FOR ITS CUSTOMERS’ INTERNAL USE
52
PMC [ PMC-SIERRA, INC ]
