mpc8309 Freescale Semiconductor, Inc, mpc8309 Datasheet - Page 38

• Manufacturer Part Number: mpc8309
• Description: Powerquicc Ii Pro Integrated Communications Processor Family Hardware Specifications
• Manufacturer: Freescale Semiconductor, Inc

USB
Figure 28
38
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 (except
USBDR_STP_USBDR_STP)
USB clock to output valid—USBDR_STP
Output hold from USB clock—all outputs
Note:
1. The symbols used for timing specifications follow the pattern of t
inputs and t
(USB) for the input (I) to go invalid (X) with respect to the time the USB clock reference (K) goes high (H). Also, t
symbolizes us timing (USB) for the USB clock reference (K) to go high (H), with respect to the output (O) going invalid (X) or
output hold time.
MPC8309 PowerQUICC II Pro Integrated Communications Processor Family Hardware Specifications, Rev. 0
and
(first two letters of functional block)(reference)(state)(signal)(state)
Output Signals
USBDR_CLK
Figure 29
Input Signals
Parameter
Output
provide the AC test load and signals for the USB, respectively.
t
USKHOV
Table 36. USB General Timing Parameters
Figure 28. USB AC Test Load
Z
Figure 29. USB Signals
0
= 50 
t
USIVKH
t
USKHOX
Symbol
t
t
t
t
t
USKHOV
USKHOV
USKHOX
USIVKH
USIXKH
t
USCK
(first two letters of functional block)(signal)(state)(reference)(state)
for outputs. For example, t
1
R
L
= 50 
t
USIXKH
Min
15
—
—
4
1
2
OV
DD
USIXKH
Max
7.5
/2
—
—
—
—
7
Freescale Semiconductor
symbolizes USB timing
Unit
ns
ns
ns
ns
ns
ns
USKHOX
Notes
for