Datasheet

MPC8260A PowerQUICC™ II Integrated Communications Processor Hardware Specifications, Rev. 2.0
32 Freescale Semiconductor
Clock Configuration Modes
1010_001 66/33 MHz 4/8 266 MHz 3 266 MHz 3 88 MHz
1010_010 66/33 MHz 4/8 266 MHz 3.5 300 MHz 3 88 MHz
1010_011 66/33 MHz 4/8 266 MHz 4 350 MHz 3 88 MHz
1010_100 66/33 MHz 4/8 266 MHz 4.5 400 MHz 3 88 MHz
1011_000 66/33 MHz 4/8 266 MHz 2 212MHz 2.5 106 MHz
1011_001 66/33 MHz 4/8 266 MHz 2.5 265 MHz 2.5 106 MHz
1011_010 66/33 MHz 4/8 266 MHz 3 318 MHz 2.5 106 MHz
1011_011 66/33 MHz 4/8 266 MHz 3.5 371 MHz 2.5 106 MHz
1011_100 66/33 MHz 4/8 266 MHz 4 424 MHz 2.5 106 MHz
1
The frequency depends on the value of PCI_MODCK. If PCI_MODCK is high (logic ‘1’), the PCI frequency is
divided by 2 (33 instead of 66 MHz, etc.) and the CPM multiplication factor is multiplied by 2. Refer to Ta ble 15.
2
Input clock frequency is given only for the purpose of reference. User should set MODCK_H–MODCK_L so that
the resulting configuration does not exceed the frequency rating of the user’s part.
3
Core frequency = (60x bus frequency)(core multiplication factor)
4
Bus frequency = CPM frequency/bus division factor
5
In this mode, PCI_MODCK must be “1”.
Table 19. Clock Configuration Modes in PCI Agent Mode (continued)
MODCK_H –
MODCK[1–3]
Input Clock
Frequency
(PCI)
1,2
CPM
Multiplication
Factor
1
CPM
Frequency
Core
Multiplication
Factor
Core
Frequency
3
Bus Division
Factor
60x Bus
Frequency
4