MSC8144 Freescale Semiconductor, MSC8144 Datasheet - Page 36

• Manufacturer Part Number: MSC8144
• Description: Quad Core Digital Signal Processor
• Manufacturer: Freescale Semiconductor

Electrical Characteristics
2.7.2
The following sections include a description of clock signal characteristics. Table 20 shows the maximum frequency values for
internal (Core, Reference, Bus and DSI) and external (CLKIN, PCI_CLK_IN and CLKOUT. The user must ensure that
maximum frequency values are not exceeded.
2.7.3
The MSC8144 has several inputs to the reset logic:
All MSC8144 reset sources are fed into the reset controller, which takes different actions depending on the source of the reset.
The reset status register indicates the most recent sources to cause a reset. Table 22 describes the reset sources.
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CLKIN slew rate
PCI_CLK_IN slew rate
CLKIN frequency
PCI_CLK_IN frequency
CLKIN duty cycle
PCI_CLK_IN duty cycle
•
•
•
•
•
•
•
•
Power-on reset (PORESET)
External hard reset (HRESET)
External soft reset (SRESET)
Software watchdog reset
JTAG reset
RapidIO reset
Software hard reset
Software soft reset
Figure 7. Start-Up Sequence with V
Clock and Timing Signals
Reset Timing
PORESET/TRST asserted
V
DD
Characteristic
MSC8144 Quad Core Digital Signal Processor Data Sheet, Rev. 1
3.3 V
1.0 V
Characteristic
applied
Table 20. Clock Frequencies
Table 21. Clock Parameters
V
DDIO
CLKIN starts toggling
DD
applied
Raised Before
V
V
1
DD
DDIO
= Nominal
V
D
F
Symbol
DDIO
PCI_CLK_IN
= Nominal
PCI_CLK_IN
D
F
CLKIN
CLKIN
PORESET
with CLKIN Started with
Min
1
1
V
MIN
25
25
40
40
V
DD
Time
DDIO
Nominal
Nominal
Max
—
—
Freescale Semiconductor
Max
150
150
60
60
V
DDIO
Unit
V/ns
V/ns
Unit
MHz
MHz
%
%