MPC8308-RDB Freescale Semiconductor, MPC8308-RDB Datasheet - Page 35

• Manufacturer Part Number: MPC8308-RDB
• Description: BOARD REF DESIGN MPC8308
• Manufacturer: Freescale Semiconductor
• Series: PowerQUICC II™ PROr
• Type: MPUr

Specifications of MPC8308-RDB

• Contents: Board, Cables, Documentation, Power Supply, Software
• Ethernet Connection Type: Serial to Ethernet
• Data Rate: 10 Mbps, 100 Mbps, 1000 Mbps
• Memory Type: DDR2, SDRAM
• Interface Type: HSSI
• Operating Voltage: 1.5 V
• Operating Current: 5 uA
• Maximum Power Dissipation: 1000 mW
• Operating Temperature Range: - 55 C to + 125 C
• Product: Modules
• For Use With/related Products: MPC8308
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

10.2.4.1
SD_REF_CLK/SD_REF_CLK are not intended to be used with, and should not be clocked by, a spread
spectrum clock source.
10.3
Figure 26
The DC and AC specification of SerDes data lanes are defined in
Note that external AC coupling capacitor is required for the PCI Express serial transmission protocol with
the capacitor value defined in specification of PCI Express protocol section.
11 PCI Express
This section describes the DC and AC electrical specifications for the PCI Express bus.
11.1
For more information, see
11.2
Table 33
Freescale Semiconductor
Symbol
t
t
REFCJ
REFPJ
t
REF
lists the PCI Express SerDes clock AC requirements.
SerDes Transmitter and Receiver Reference Circuits
DC Requirements for PCI Express SD_REF_CLK and
SD_REF_CLK
AC Requirements for PCI Express SerDes Clocks
shows the reference circuits for SerDes data lane’s transmitter and receiver.
REFCLK cycle time (for 125 MHz and 100 MHz)
REFCLK cycle-to-cycle jitter. Difference in the period
of any two adjacent REFCLK cycles.
Phase jitter. Deviation in edge location with respect to
mean edge location.
Spread Spectrum Clock
Transmitter
MPC8308 PowerQUICC II Pro Processor Hardware Specification, Rev. 2
Figure 26. SerDes Transmitter and Receiver Reference Circuits
Table 33. SD_REF_CLK and SD_REF_CLK AC Requirements
Parameter Description
Section 10.2, “SerDes Reference Clocks.”
50 Ω
50 Ω
TX n
TX n
RX n
RX n
Min
–50
—
8
Section 11, “PCI Express.”
Typ
10
—
—
50 Ω
50 Ω
Receiver
Max
100
50
—
Units
ns
ps
ps
PCI Express
Notes
—
—
—
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