DS92UT16 Datasheet, PDF (12/111 Pages) Texas Instruments – DS92UT16TUF UTOPIA-LVDS Bridge for 1.6 Gbps Bi-directional Data Transfers

DS92UT16
OBSOLETE
SNOS992E – JANUARY 2002 – REVISED APRIL 2013
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BIP16
A Bit-Interleaved-Parity mechanism provides a live error performance metric on the LVDS link. A BIP16 value is
calculated over a previous block of 28 containers and inserted in the F1/F2 bytes of containers 27 and 55, as
shown in F Channel Byte Usage Within the Frame. At the far end, the re-calculated BIP16 values are compared
against the received values. Any bit errors in this comparison are counted. Should the number of errors exceed a
programmed threshold, then an interrupt may be raised.
F Channel (Flow Control and OAM) Bandwidth Analysis
This section analyses the bandwidth used by the various components of the F Channel. The figures are
dependent upon the link bandwidth and the size of the PDU/ATM cells being carried in the Transport Containers.
This illustration is restricted to 800 Mbps and PDU sizes of 52 and 64 bytes. By adding the 4 bytes for the F
Channel, the TCs are then 56 and 68 bytes respectively.
Table 6 illustrates the number of bytes used for each function in the F Channel. The top row gives the total
number of Transport Containers per Frame as 56. It then shows the number of bytes in each Frame for OAM
and Flow Control. There is a total of 112 bytes in each Frame for the F Channel.
Table 7 shows the bit rate used by each portion of the F Channel. The larger 68 byte container uses a lower
proportion of the channel bandwidth for F Channel functions.
Table 8 shows the percentage of the channel bandwidth used for each of the functions. The total F Channel
bandwidth is only 3.57% of total bandwidth even with the smaller container size.
Table 6. F Channel Bandwidth—Bytes
Number of Transport Containers in Frame (8 rows x 7
columns)
56
Bytes per Frame for Remote Alarms and signaling
1
Bytes per Frame for Link Label
1
Bytes per Frame for ECC
8
Bytes per Frame Reserved
2
Bytes per Frame for BIP16
4
Bytes per Frame for OAM
16
Bytes per Frame for Flow Control
96
Bytes per Frame for F Channel
112
Table 7. F Channel Bandwidth—Mbps
Link BW - Mbps
Container Size - Bytes
Remote Alarm BW - Mbps
Link Label BW - Mbps
ECC BW - Mbps
Reserved BW - Mbps
BIP16 BW - Mbps
OAM BW - Mbps
Flow Control BW - Mbps
F Channel BW - Mbps
800
56
0.26
0.26
2.04
0.51
1.02
4.08
24.49
28.57
800
68
0.21
0.21
1.68
0.42
0.84
3.36
20.17
23.53
12
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