MSC8144 Freescale Semiconductor, MSC8144 Datasheet - Page 42

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

Electrical Characteristics
Figure 11 provides the AC test load for the DDR bus.
2.7.5
2.7.5.1
Table 26 lists AC requirements.
42
REFCLK cycle time
REFCLK cycle-to-cycle
jitter
Phase jitter
Parameter Description
Serial RapidIO Timing and SGMII Timing
AC Requirements for SRIO_REF_CLK and SRIO_REF_CLK
Output
Table 26. SDn_REF_CLK and SDn_REF_CLK AC Requirements
MSC8144 Quad Core Digital Signal Processor Data Sheet, Rev. 1
Symbol
t
t
REFCJ
REFPJ
t
REF
Z
Min
–40
0
Figure 11. DDR AC Test Load
—
—
= 50 Ω
10 (8, 6.4)
Typical
—
—
Max
80
40
—
R
L
= 50 Ω
Units
ns
ps
ps
8 ns applies only to serial RapidIO system
with 125-MHz reference clock. 6.4 ns
applies only to serial RapidIO systems with
a 156.25 MHz reference clock.
Note:
Difference in the period of any two
adjacent REFCLK cycles
Deviation in edge location with respect to
mean edge location
V
DD
/2
SGMII uses the 8 ns (125 MHz)
value only.
Comments
Freescale Semiconductor