GXM Datasheet, PDF (189/244 Pages) National Semiconductor (TI) – Geode™ GXm Processor Integrated x86 Solution with MMX Support

Electrical Specifications (Continued)
Table 7-9. PCI Interface Signals
Symbol Parameter
Min
Max
Unit Notes
t_VAL1
Delay Time, SYSCLK to Signal Valid for Bused
Signals
2
11
ns
t_VAL2
t_ON
t_OFF
t_SU1
t_SU2
t_H
Note:
Delay Time, SYSCLK to Signal Valid for GNT#
2
12
ns Note
Delay Time, Float to Active
2
ns
Delay Time, Active to Float
28
ns
Input Setup Time for Bused Signals
7
ns
Input Setup Time for REQ#
12
ns Note
Input Hold Time to SYSCLK
0
ns
GNT# and REQ# are point-to-point signals. All other PCI interface signals are bused.
Refer to Chapter 4 of PCI Local Bus Specification, Revision 2.1, for more detailed information.
SYSCLK
OUTPUT
TRISTATE
OUTPUT
t_VAL1,2
t_ON
t_OFF
Figure 7-4. Output Timing
SYSCLK
INPUT
t_SU1,2
t_H
Figure 7-5. Input Timing
Revision 3.1
189
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