mpc8260aec Freescale Semiconductor, Inc, mpc8260aec Datasheet - Page 23

• Manufacturer Part Number: mpc8260aec
• Description: Mpc826xa Hip4 Family Hardware
• Manufacturer: Freescale Semiconductor, Inc

1.3.2
The MPC8265 and the MPC8266 have three clocking modes: local, PCI host, and PCI agent. The clocking
mode is set according to three input pins—PCI_MODE, PCI_CFG[0], PCI_MODCK—as shown in
Table 14.
In addition, note the following:
MOTOROLA
1
2
3
MODCK_H–MODCK[1–3]
Because of speed dependencies, not all of the possible configurations in Table 13 are applicable.
The user should choose the input clock frequency and the multiplication factors such that the frequency of the
Input clock frequency is given only for the purpose of reference. User should set MODCK_H–MODCK_L so that
CPU is equal to or greater than150 MHz and the CPM ranges between 66–233 MHz.
the resulting configuration does not exceed the frequency rating of the user’s part.
0111_111
1000_000
1000_001
1000_010
1000_011
1000_100
PCI_MODE
PCI Mode
1
0
0
0
0
In PCI mode only, PCI_MODCK comes from the LGPL5 pin and
MODCK_H[0–3] comes from {LGPL0, LGPL1, LGPL2, LGPL3}.
The minimum Tval = 2 when PCI_MODCK = 1, and the minimum
Tval = 1 when PCI_MODCK = 0. Therefore, designers should use clock
configurations that fit this condition to achieve PCI-compliant AC timing.
Clock configurations change only after POR is asserted.
PCI_CFG[0]
Table 13. Clock Configuration Modes
Frequency
Table 14. MPC8265 and MPC8266 Clocking Modes
MPC826xA (HiP4) Family Hardware Specifications
Input Clock
Pins
—
66 MHz
66 MHz
66 MHz
66 MHz
66 MHz
66 MHz
0
0
1
1
2,3
PCI_MODCK
NOTE: Tval (Output Hold)
CPM Multiplication
NOTE: PCI_MODCK
—
0
1
0
1
Factor
3.5
3.5
3.5
3.5
3.5
3.5
NOTE
2
Clocking Mode
PCI agent
Local bus
PCI host
Frequency
233 MHz
233 MHz
233 MHz
233 MHz
233 MHz
233 MHz
CPM
1
(Continued)
2
Core Multiplication
Clock Configuration Modes
Frequency Range
Factor
2.5
3.5
4.5
PCI Clock
2
3
4
(MHZ)
50–66
25–50
50–66
25–50
—
2
Frequency
133 MHz
166 MHz
200 MHz
233 MHz
266 MHz
300 MHz
Core
23
2