Local Bus
9.2
USB AC Electrical Specifications
Table 39. USB General Timing Parameters (ULPI Mode Only)
Parameter
Symbol
1
t
USCK
t
USIVKH
t
USIXKH
t
USKHOV
t
USKHOX
Min
15
4
1
—
2
Max
—
—
—
7
—
Unit
ns
ns
ns
ns
ns
describes the general timing parameters of the USB interface of the device.
USB clock cycle time
Input setup to USB clock—all inputs
input hold to USB clock—all inputs
USB clock to output valid—all outputs
Output hold from USB clock—all outputs
and
provide the AC test load and signals for the USB, respectively.
Output
Z
0
= 50
Ω
OVDD/2
R
L
= 50
Ω
Figure 21. USB AC Test Load
USBDR_CLK
t
USIVKH
Input Signals
t
USIXKH
t
USKHOV
Output Signals
t
USKHOX
Figure 22. USB Interface Timing Diagram
10 Local Bus
This section describes the DC and AC electrical specifications for the local bus interface of the
MPC8378E.
MPC8378E PowerQUICC
™
II Pro Processor Hardware Specifications, Rev. 2
Freescale Semiconductor
39
FREESCALE [ FREESCALE SEMICONDUCTOR, INC ]
