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Electrical Specifications
9.3.5
PCI Bus Interface
The SC3200 is compliant with PCI Bus Rev. 2.1 specifica-
tions. Relevant information from the PCI Bus specifications
is provided below.
Symbol
Parameter
I
(AC)
Switching current high
OH
(Note 1)
Test point (Note 2)
I
(AC)
Switching current low
OL
(Note 1)
Test point (Note 2)
I
Low clamp current
CL
I
High clamp current
CH
SLEW
Output rise slew rate
R
(Note 3)
SLEW
Output fall slew rate
F
Note 1. Refer to the V/I curves in Figure 9-13. This specification does not apply to PCICLK0, PCICLK1, and PCIRST#
which are system outputs.
Note 2. Maximum current requirements are met when drivers pull beyond the first step voltage. Equations which define
these maximum values (A and B) are provided with relevant diagrams in Figure 9-13. These maximum values are
guaranteed by design.
Note 3. Rise slew rate does not apply to open-drain outputs. This parameter is interpreted as the cumulative edge rate
across the specified range, according to the test circuit in Figure 9-12.
Figure 9-12. Testing Setup for Slew Rate and Minimum Timing
AMD Geode™ SC3200 Processor Data Book
Table 9-17. PCI AC Specifications
Min
-12V
IO
-17.1(V
-V
IO
OUT
16V
IO
26.7V
OUT
-25+(V
+1)/0.015
IN
25+(V
-V
-1)/0.015
IN
IO
1
1
Pin
Output
Buffer
Ω
1 K
All parameters in Table 9-17 are not 100% tested. The
parameters in this table are further described in Figure 9-
13.
Max
)
Equation A
(Figure 9-13)
-32V
IO
Equation B
(Figure 9-13)
38V
IO
4
4
0.5" max.
Ω
10 pF
1 K
32581C
Unit
Comments
≤ 0.3V
mA
0 < V
OUT
IO,
mA
0.3V
< V
< 0.9V
IO
OUT
0.7V
< V
< V
IO
OUT
mA
V
= 0.7V
OUT
IO
≥ 0.6V
mA
V
> V
IO
OUT
mA
0.6V
> V
> 0.1V
IO
OUT
0.18V
>V
>0
IO
OUT
mA
V
= 0.18V
OUT
IO
mA
-3 < V
< -1
IN
mA
V
+4 > V
> V
IO
IN
IO
V/ns
0.2V
- 0.6V
Load
IO
IO
V/ns
0.6V
- 0.2V
Load
IO
IO
V
CC
IO
IO
IO
IO
+1
371
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