82551QM Datasheet, PDF (103/120 Pages) Intel Corporation – Fast Ethernet Multifunction PCI/CardBus Controller

Networking Silicon — 82551QM
12.4.2.2 PCI/CardBus Timings
Table 77. PCI/CardBus Timing Parameters
Symbol
Parameter
Min
T14 t_val
T15 t_val(ptp)
T16 t_on
T17 t_off
T18 t_su
T19 t_su(ptp)
T20 t_h
T21 t_rst
T22 T_rst-clk
T23 T_rst-off
PCI CLK to Signal Valid Delay
2
CardBus CLK to Signal Valid Delay
2
PCI CLK to Signal Valid Delay (point-
to-point)
2
Float to Active Delay
2
Active to Float Delay
Input Setup Time to CLK
7
PCI Input Setup Time to CLK (point-to-
point)
10
Input Hold Time from CLK
0
Reset Active Time After Power Stable
1
PCI Reset Active Time After CLK
Stable
100
CardBus Reset Active Time After CLK
Stable
100
Reset Active to Output Float Delay
Max Units
11
ns
18
ns
12
ns
ns
28
ns
ns
ns
ns
ms
clocks
clocks
40
ns
Notes
1, 2, 3
1, 7
1, 2, 3
1
1
3, 4
3, 4
5
5
5
5
5, 6
NOTES:
1. Timing measurement conditions are illustrated in Figure 24.
2. PCI minimum times are specified with loads as detailed in the PCI Bus Specification, Revision 2.1, Section
4.2.3.2.
3. n a PCI environment, REQ# and GNT# are point-to-point signals and have different output valid delay times
and input setup times than bussed signals. All other signals are bussed.
4. Timing measurement conditions are illustrated in Figure 25.
5. RST# is asserted and de-asserted asynchronously with respect to the CLK signal.
6. All PCI and CardBus interface output drivers are floated when RST# is active.
7. CardBus minimum times are specified with a 0 pF equivalent load. Maximum times are specified with a 30 pF
equivalent load. Actual test loads may vary but must be correlated to these loads.
12.4.2.3
Flash/Modem Interface Timings
The 82551QM is designed to support up to 150 ns of Flash access time. The V_PP signal in the Flash
implementation should be connected permanently to 12 V. Thus, writing to the Flash is controlled
only by the FLWE# pin.
Table 78 provides the timing parameters for the Flash interface signals. The timing parameters are
illustrated in Figure 26 and Figure 27.
Modem is supported through the Flash interface when the following conditions apply:
• FLA6:0, FLD7:0, FLCS#, FLOE#, and FLWE# have the same functions for Flash and modem.
Datasheet
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