MSC8122 Freescale Semiconductor, MSC8122 Datasheet - Page 26

• Manufacturer Part Number: MSC8122
• Description: Quad Digital Signal Processor
• Manufacturer: Freescale Semiconductor

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Electrical Characteristics
2.5.5.2
Table 17 describes the
For designs that use the
values specified for
26
Notes:
No.
20
21
22
23
24
Rise-to-rise skew
•
•
Fall-to-fall skew
•
•
CLKOUT phase (1.2 V, 133 MHz)
•
•
CLKOUT phase (1.1 V, 133 MHz)
•
•
CLKOUT phase (1.1 V, 100 MHz)
•
•
1.
2.
3.
4.
V
V
V
V
Phase high
Phase low
Phase high
Phase low
Phase high
Phase low
DD
DD
DD
DD
A positive number indicates that CLKOUT precedes CLKIN, A negative number indicates that CLKOUT follows CLKIN.
Skews are measured in clock mode 29, with a CLKIN:CLKOUT ratio of 1:1. The same skew is valid for all clock modes.
CLKOUT skews are measured using a load of 10 pF.
CLKOUT skews and phase are not measured for 500/166 Mhz parts because these parts only use CLKIN mode.
CLKIN to CLKOUT Skew
= 1.1 V
= 1.2 V
= 1.1 V
= 1.2 V
CLKIN
CLKOUT-
CLKOUT
synchronization. Figure 12 shows the relationship between the
MSC8122 Quad Digital Signal Processor Data Sheet, Rev. 15
to-
synchronization mode, use the skew values listed in Table 16 to adjust the rise-to-fall timing
CLKIN
Characteristic
CLKOUT
Figure 12. CLKOUT and CLKIN Signals.
CLKIN
skew timing.
Table 16. CLKOUT Skew
20
Min
–1.5
–0.8
0.0
0.0
2.8
2.8
2.2
2.2
3.3
3.3
CLKOUT
1
21
Freescale Semiconductor
and
CLKIN
Max
0.95
0.85
1.0
1.0
—
—
—
—
—
—
1
timings.
Units
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns