S2060
GIGABIT ETHERNET TRANSCEIVER
Figure 12. Receiver Timing Half Rate Mode (RATEN Inactive)
SERIAL DATA IN
RBC1
COMMA
RX[9-0]
T3 T4
T3 T4
Table 9. S2060 Receiver Timing
Parameters
T3
T4
Description
Min
3.0
2.0
-
Max Units
Conditions
See Note 1.
Data valid before RBC1 (RBC0)
Data valid after RBC1 (RBC0)
RBC1, RBC0 Rise and Fall Time
RBC1 to RBC0 Skew
-
ns
ns
ns
ns
ns
µs
-
TRCR, TRCF
2.4
8.5
2.4
2.5
Measured +.8 V to +2.0 V.
Rising edge to rising edge.
Measured +.8 V to +2.0 V.
Skew
7.5
-
T
DR, TDF
Data Output Rise and Fall Time
TLOCK (startup) Startup acquision lock time (1.25G)
-
90% input data eye (see
Figure 19).
-
100
ns
TLOCK
(reacquire)
Data Acquisition Lock Time (1.25G)
-
250
ns
%
24% input data eye.
Duty Cycle
RBC1 (RBC0)
40
60
-
TJ
Total Input Jitter Tolerance
Deterministic Input Jitter Tolerance
599
370
ps
ps
As specified in IEEE 802.3z.
As specified in IEEE 802.3z.
TDJ
-
1. All AC measurements are made from the reference voltage level of the clock (+1.4 V) to the valid input or output data
levels (+.8 V or +2.0 V).
Figure 13. Loopback Operation
OTHER OPERATING MODES
Loopback Mode
output
disabled
The S2060 supports internal loopback mode in
which the serial data from the transmitter replaces
external serial data. The loopback function is en-
abled when the loopback enable signal, EWRAP, is
set ACTIVE.
CSU
The loopback mode provides the ability to perform
system diagnostics and to perform off-line testing of
the interface to guarantee the integrity of the serial
channel before enabling the transmission medium.
Figure 13 shows the basic loopback operation.
CRU
March 7, 2001 / Revision H
18
AMCC [ APPLIED MICRO CIRCUITS CORPORATION ]
