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GXM Datasheet, PDF (186/244 Pages) National Semiconductor (TI) – Geode™ GXm Processor Integrated x86 Solution with MMX Support | |||
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Electrical Specifications (Continued)
7.6 AC CHARACTERISTICS
The following tables list the AC characteristics including
output delays, input setup requirements, input hold
requirements and output float delays. The rising-clock-
edge reference level VREF, and other reference levels are
shown in Table 7-6. Input or output signals must cross
these levels during testing.
Input setup and hold times are specified minimums that
define the smallest acceptable sampling window for which
a synchronous input signal must be stable for correct oper-
ation.
All AC tests are at VCC2 = 2.75V to 3.05V (2.9V nominal),
TC = 0oC to 70oC or 85o, CL = 50 pF unless otherwise
specified.
Table 7-6. Drive Level and Measurement Points
for Switching Characteristics
Symbol
Voltage (V)
VREF
1.5
VIHD
2.4
VILD
0.4
TX
CLK
OUTPUTS
VIHD
VILD
A
B Min
Valid Output n
Max
Valid Output n+1
INPUTS
VIHD
VILD
C
D
Valid Input
Legend: A = Maximum Output Delay Specification
B = Minimum Output Delay Specification
C = Minimum Input Setup Specification
D = Minimum Input Hold Specification
VREF
VREF
VREF
Figure 7-1. Drive Level and Measurement Points for Switching Characteristics
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