Intel IXP2800 and IXP2850 Network Processors
Electrical Specifications
112
Datasheet
Table 50. Data Path Interface Timing (Static Alignment)
Symbol
Parameter
Min
Max
Units
fD
TDCLK / RDCLK Frequency
200
500
MHz
TDCLK / RDCLK Duty Cycle 1
1. Guaranteed by design.
45
55
%
T_dia,
Data invalid window with respect to clock edge
(Reference point A).
—
280
ps
Worst-case cumulative skew and jitter contribution
(Reference point B).
—
790
ps
Data valid window with respect to clock edge.
(Reference point B)
—
1/(2D) - G_max
ps
20% - 80% rise and fall times
(UI = fD)
(Reference point A)
(Reference point B)
100 ps
0.30 UI
0.36 UI
UI
Comments:
1. Rise and fall times assume nominal 100-ohm termination and exclude reflections.
2. All timing parameters are measured relative to the differential crossing point of the corresponding clock
signal.
3. Jitter parameters are peak-to-peak, measured above fD/1000 and below fD.
4. Receiver sensitivity is assumed to be less than or equal to 100 mV.
5. Assumes a 5 pF output load at reference point A, a 10 pF load at reference point B, and a 50-ohm
transmission line in-between.
6. Assumes up to a 20 ps skew between traces of a differential pair.
Table 51. Data Path Interface Timing (Dynamic Alignment)
Symbol
Parameter
Min
Max
Unit
fD
TDCLK / RDCLK Frequency
200
500
MHz
—
TDCLK / RDCLK Jitter (at reference point A) 1
1. Guaranteed by design.
—
0.10
UI
—
TDAT / RDAT / TCTL / RCTL Jitter (at reference point A)
1—0.24
UI
—
20% - 80% rise and fall
(UI = fD)
(Reference point A)
(Reference point B)
100 ps
0.30 UI
0.36 UI
UI
Comments:
1. Rise and fall times assume nominal 100-ohm termination and exclude reflections.
2. All timing parameters are measured relative to the differential crossing point of the corresponding clock
signal.
3. Jitter parameters are peak-to-peak, measured above fD/1000 and below fD.
4. Receiver sensitivity is assumed to be less than or equal to 100 mV.
5. Assumes a 5 pF output load at reference point A, a 10 pF load at reference point B, and a 50-ohm
transmission line in-between.
6. Assumes up to a 20 ps skew between traces of a differential pair.