mpc8641 Freescale Semiconductor, Inc, mpc8641 Datasheet - Page 106

• Manufacturer Part Number: mpc8641
• Description: Integrated Host Processor Hardware Specifications
• Manufacturer: Freescale Semiconductor, Inc

Clocking
18.2
The MPX clock is the clock that drives the MPX bus, and is also called the platform clock. The frequency
of the MPX is set using the following reset signals, as shown in
106
Memory bus clock frequency
Notes:
1. Caution: The MPX clock to SYSCLK ratio and e600 core to MPX clock ratio settings must be chosen such that the resulting
2. The memory bus clock speed is half the DDR/DDR2 data rate, hence, half the MPX clock frequency.
Platform/MPX bus clock frequency
Notes:
1. Caution: The MPX clock to SYSCLK ratio and e600 core to MPX clock ratio settings must be chosen such that the resulting
2. Platform/MPX frequencies between 400 and 500 MHz are not supported.
Local bus clock speed (for Local Bus Controller)
Notes:
1. The Local bus clock speed on LCLK[0:2] is determined by MPX clock divided by the Local Bus PLL ratio programmed in
SYSCLK frequency, e600 (core) frequency, and MPX clock frequency do not exceed their respective maximum or minimum
operating frequencies. Refer to
for ratio settings.
SYSCLK frequency, e600 (core) frequency, and MPX clock frequency do not exceed their respective maximum or minimum
operating frequencies. Refer to
for ratio settings.
LCRR[CLKDIV]. See the reference manual for the MPC8641D for more information on this.
•
SYSCLK input signal
MPX to SYSCLK PLL Ratio
MPC8641 and MPC8641D Integrated Host Processor Hardware Specifications, Rev. 2
Characteristic
Characteristic
Characteristic
Table 66. Platform/MPX bus Clocking Specifications
Section 18.2, “MPX to SYSCLK PLL Ratio,”
Section 18.2, “MPX to SYSCLK PLL Ratio,”
Table 65. Memory Bus Clocking Specifications
Table 67. Local Bus Clocking Specifications
1000, 1250, 1333, 1500MHz
1000, 1250, 1333, 1500MHz
1000, 1250, 1333, 1500MHz
Maximum Processor Core
Maximum Processor Core
Maximum Processor Core
Min
Min
200
Min
400
25
Frequency
Frequency
Frequency
and
and
Table
Section 18.3, “e600 to MPX clock PLL Ratio,”
Section 18.3, “e600 to MPX clock PLL Ratio,”
68:
500-600
Max
Max
Max
133
300
Freescale Semiconductor
MHz
MHz
Unit
Unit
MHz
Unit
Notes
Notes
Notes
1, 2
1, 2
1