PCI/PCI-X
provides the AC test load for the I
2
C.
Output
Z
0
= 50
Ω
OV
DD
/2
R
L
= 50
Ω
Figure 33. I
2
C AC Test Load
shows the AC timing diagram for the I
2
C bus.
SDA
t
I2CF
t
I2CL
SCL
t
I2SXKL
S
t
I2CH
t
I2DXKL,
t
I2OVKL
Sr
t
I2SVKH
t
I2PVKH
P
S
t
I2DVKH
t
I2SXKL
t
I2KHKL
t
I2CR
t
I2CF
Figure 34. I
2
C Bus AC Timing Diagram
14 PCI/PCI-X
This section describes the DC and AC electrical specifications for the PCI/PCI-X bus of the MPC8548E.
Note that the maximum PCI-X frequency in synchronous mode is 110 MHz.
14.1
PCI/PCI-X DC Electrical Characteristics
Table 47. PCI/PCI-X DC Electrical Characteristics
1
Parameter
Symbol
V
IH
V
IL
I
IN
V
OH
V
OL
Min
2
–0.3
—
2.4
—
Max
OV
DD
+ 0.3
0.8
±5
—
0.4
Unit
V
V
μA
V
V
Notes
—
—
2
—
—
provides the DC electrical characteristics for the PCI/PCI-X interface.
High-level input voltage
Low-level input voltage
Input current (V
IN
= 0 V or V
IN
= V
DD
)
High-level output voltage (OV
DD
= min, I
OH
= –2 mA)
Low-level output voltage (OV
DD
= min, I
OL
= 2 mA)
Notes:
1. Ranges listed do not meet the full range of the DC specifications of the
PCI 2.2 Local Bus Specifications.
2. Note that the symbol V
IN
, in this case, represents the OV
IN
symbol referenced in
and
MPC8548E PowerQUICC™ III Integrated Processor Hardware Specifications, Rev. 6
56
Freescale Semiconductor
FREESCALE [ FREESCALE SEMICONDUCTOR, INC ]
