參數(shù)資料
型號(hào)： VSC7217
廠(chǎng)商： Vitesse Semiconductor Corporation.
英文描述： Multi-Gigabit Interconnect Chip
中文描述： 千兆位級(jí)互連芯片
文件頁(yè)數(shù)： 15/36頁(yè)
文件大?。?/td> 516K
代理商： VSC7217
VITESSE
SEMICONDUCTOR CORPORATION
741 Calle Plano, Camarillo, CA 93012 805/388-3700 FAX: 805/987-5896
Page 15
6/14/00
VITESSE
Preliminary Datasheet
VSC7217
Multi-Gigabit Interconnect Chip
G52325-0, Rev. 3.0
Link Status Outputs
The receiver
ERRn
,
K CHn
and
IDL En
outputs indicate status for each channel as shown below in
Table7. Since this status is encoded, multiple conditions could occur simultaneously so the states are prioritized
as indicated (1 being highest priority). For example, if both Out-of-Band and Disparity Errors occur, only an
Out-of-Band Error is reported because it has higher priority.
The
ERRn
,
K CHn
and
IDLEn
status signals apply to the data on
Rn(7:0)
on a per-character basis. The
only exception to this is the Underrun/Overrun indication. This indication is asserted coincident with the dupli-
cated character when an underrun occurs, and is asserted following the deleted character (e.g., on the cycle
where the deleted character should have appeared) when overrun occurs.
Table 7: Receiver Status Signals
ERRn
KCHn
IDLEn
Priority
Link Status
0
0
0
7
Valid Data Transmission:
A valid 10B data character with correct
disparity was received. The correctly decoded version of this
character is on
Rn(7:0)
.
Underrun/Overrun Error:
The elastic buffer has not been able to
add/drop an IDLE when required. Data on
Rn(7:0)
is invalid.
K xx.x Special Character Detected (not IDLE):
A valid 10B
special character with correct disparity was received. The correctly
decoded version of this character, per Table3, is on
Rn(7:0)
.
IDLE Detected:
A valid IDLE character (K28.5) with correct
disparity was received. The correctly decoded version of this
character, per Table3, is on
Rn(7:0)
.
Out-of-band Error Detected
: A character was received which
was not a valid 10B data or control character. Data on
Rn(7:0)
is
invalid.
Disparity Error Detected:
A valid 10B character was received
which did not have the expected disparity.
Rn(7:0)
is invalid.
Loss of Synchronization:
The receiver state machine is in the
Loss-of-Sync state. Data on
Rn(7:0)
is invalid.
RESYNC:
The receiver state machine is in the Re-
Synchronization state. Data on
Rn(7:0)
is a decoded version of
K28.1, K28.5 or K28.7.
0
0
1
1
0
1
0
6
0
1
1
5
1
0
0
3
1
0
1
4
1
1
0
2
1
1
1
2
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