L-ET4148-50C-DB LSI, L-ET4148-50C-DB Datasheet - Page 250

• Manufacturer Part Number: L-ET4148-50C-DB
• Manufacturer: LSI

Specifications of L-ET4148-50C-DB

• Lead Free Status / RoHS Status: Supplier Unconfirmed

ET4148-50
Single-Chip 48 x 1 Gbit/s + 2 x 10 Gbits/s Layer 2+ Ethernet Switch
Appendix A: Registers
Tx_Collision_Histogram
Table 351. Tx_Collision_Histogram Field Parameters
Statistics counters roll over from their maximum count to zero without warning or indication that a rollover has
occurred. It is expected that the supervisor sample these counters often and use the delta from a previous sample
to the current sample to determine the overall count delta. If the current sample has a smaller value than the previ-
ous sample (indicating a rollover), then 2
delta to determine the actual delta. All statistics counters’ widths are scaled to allow for sampling by the supervisor
at ten times per second without risk of missing a rollover event.
250
tx_single_collision_packets[15:0]
tx_multiple_collision_packets[15:0]
tx_excessive_collision_packets[15:0]
tx_late_collision_packets[15:0]
tx_deferred_packets[17:0]
Field Name
REFERENCE
(continued)
PORT
(continued)
XG1
Figure 263. Port Numbering Scheme
49
n
XG0
(where n is the number of bits in the statistics counter) is added to the
48
Agere Systems - Proprietary
G47
47
Offset = 800.14
Spacing = 16.0
Spacing = 16.0
Spacing = 16.0
Spacing = 16.0
Instances = 50
Instances = 50
Instances = 50
Instances = 50
Instances = 50
G = 10/100/1000 Mbits/s PORT
XG = 10 Gbits/s PORT
SU = SUPERVISOR
Offset = 12.16
Spacing = 4.0
PORT NUMBERING SCHEME
Offset = 0.16
Offset = 4.16
Offset = 8.16
Mode = R/W
Mode = R/W
Mode = R/W
Mode = R/W
Mode = R/W
Parameters
G46
46
G45
45
G44
44
The number of packets successfully transmit-
ted after experiencing one collision.
The number of packets successfully transmit-
ted after experiencing multiple collisions.
The number of packets that fail to be transmit-
ted due to excessive collisions.
The number of packets that fail to be transmit-
ted due to a late collision. Such packets may
have experienced one or more normal colli-
sions prior to the late collision.
A count of all packets that had to defer to
either traffic on the network (half-duplex
mode) or to an active pause timer (full-duplex
mode).
G3
3
G2
2
Description
G1
1
Preliminary Data Sheet
G0
0
Agere Systems Inc.
April 2006