82551QM Datasheet, PDF (100/120 Pages) Intel Corporation – Fast Ethernet Multifunction PCI/CardBus Controller

82551QM — Networking Silicon
Table 73. AC Specifications for CardBus Signaling
Symbol Parameter
Condition
t_RCB
t_FCB
CardBus Output
Rise Time
0.2V_CC to 0.6V_CC
CardBus Output
Fall Time
0.6V_CC to 0.2V_CC
Min
0.25
0.25
Max Units Notes
1.0
V/ns
1.0
V/ns
12.4
Timing Specifications
12.4.1
Clocks Specifications
12.4.1.1 PCI/CardBus Clock Specifications
The 82551QM uses the PCI Clock signal directly. Figure 23 shows the clock waveform and
required measurement points for the PCI Clock signal. Table 74 summarizes the PCI Clock
specifications.
Figure 23. PCI/CardBus Clock Waveform
0.475V_CC
0.4V_CC
0.325V _CC
0.6V_CC
T_high
T_cyc
0.2V_CC
T_low
0.4V_CC p-to-p
(minimum)
Table 74. PCI/CardBus Clock Specifications
Symbol
T1 T_cyc
T2 T_high
T3 T_low
T4 T_slew
Parameter
CLK Cycle Time
CLK High Time
CLK Low Time
CLK Slew Rate
Min
Max
Units Notes
30
ns
1
11
ns
11
ns
1
4
V/ns
2
NOTES:
1. The 82551QM will work with any PCI clock frequency up to 33 MHz.
2. Rise and fall times are specified in terms of the edge rate measured in V/ns. This slew rate is met across the
minimum peak-to-peak portion of the clock waveform as shown in Figure 23.
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Datasheet