Electronic Component Distributor. Source::Freescale Semiconductor
P.N:MPC8349CZUAGDB Desc:IC MPU POWERQUICC II PRO 672TBGA
Web:http://www.hotenda.cn E-mail:[email protected] Phone:(+86) 075583794354
MPC8349EA PowerQUICC II Pro Integrated Host Processor Hardware Specifications, Rev. 13
Freescale Semiconductor
13
RESET Initialization
4.3
TSEC Gigabit Reference Clock Timing
Table 8
provides the TSEC gigabit reference clocks (EC_GTX_CLK125) AC timing specifications.
5
RESET Initialization
This section describes the DC and AC electrical specifications for the reset initialization timing and
electrical requirements of the MPC8349EA.
5.1
RESET DC Electrical Characteristics
Table 9
provides the DC electrical characteristics for the RESET pins of the MPC8349EA.
Table 8. EC_GTX_CLK125 AC Timing Specifications
At recommended operating conditions with LV
DD
= 2.5 ± 0.125 mV/ 3.3 V ± 165 mV
Parameter
Symbol
Min
Typical
Max
Unit
Notes
EC_GTX_CLK125 frequency
t
G125
—
125
—
MHz
—
EC_GTX_CLK125 cycle time
t
G125
—
8
—
ns
—
EC_GTX_CLK125 rise and fall time
LV
DD
= 2.5 V
LV
DD
= 3.3 V
t
G125R
/t
G125F
—
—
0.75
1.0
ns
1
EC_GTX_CLK125 duty cycle
GMII, TBI
1000Base-T for RGMII, RTBI
t
G125H
/t
G125
45
47
—
55
53
%
2
EC_GTX_CLK125 jitter
—
—
—
±150
ps
2
Notes:
1. Rise and fall times for EC_GTX_CLK125 are measured from 0.5 and 2.0 V for LV
DD
= 2.5 V and from 0.6 and 2.7 V for
LV
DD
= 3.3 V.
2. EC_GTX_CLK125 is used to generate the GTX clock for the eTSEC transmitter with 2% degradation. The EC_GTX_CLK125
duty cycle can be loosened from 47%/53% as long as the PHY device can tolerate the duty cycle generated by the eTSEC
GTX_CLK. See
Section 8.2.4, “RGMII and RTBI AC Timing Specifications
for the duty cycle for 10Base-T and 100Base-T
reference clock.
Table 9. RESET Pins DC Electrical Characteristics
1
Parameter
Symbol
Condition
Min
Max
Unit
Input high voltage
V
IH
—
2.0
OV
DD
+ 0.3
V
Input low voltage
V
IL
—
–0.3
0.8
V
Input current
I
IN
—
—
±5
μ
A
Output high voltage
2
V
OH
I
OH
= –8.0 mA
2.4
—
V
Output low voltage
V
OL
I
OL
= 8.0 mA
—
0.5
V
13 / 87