Datasheet

MPC8260A PowerQUICC™ II Integrated Communications Processor Hardware Specifications, Rev. 2.0
Freescale Semiconductor 29
Clock Configuration Modes
3.2.2 PCI Agent Mode
The frequencies listed in Table 18 and Table 19 are for the purpose of illustration only. Users must select
a mode and input bus frequency so that the resulting configuration does not exceed the frequency rating
of the user’s device.
1001_010 66 MHz 3.5 233 MHz 3.5 233 MHz 4/8 58/29 MHz
1001_011 66 MHz 3.5 233 MHz 4 266 MHz 4/8 58/29 MHz
1001_100 66 MHz 3.5 233 MHz 4.5 300 MHz 4/8 58/29 MHz
1010_000 100 MHz 2 200 MHz 2 200 MHz 3/6 66/33 MHz
1010_001 100 MHz 2 200 MHz 2.5 250 MHz 3/6 66/33 MHz
1010_010 100 MHz 2 200 MHz 3 300 MHz 3/6 66/33 MHz
1010_011 100 MHz 2 200 MHz 3.5 350 MHz 3/6 66/33 MHz
1010_100 100 MHz 2 200 MHz 4 400 MHz 3/6 66/33 MHz
1011_000 100 MHz 2.5 250 MHz 2 200 MHz 4/8 62/31 MHz
1011_001 100 MHz 2.5 250 MHz 2.5 250 MHz 4/8 62/31MHz
1011_010 100 MHz 2.5 250 MHz 3 300 MHz 4/8 62/31 MHz
1011_011 100 MHz 2.5 250 MHz 3.5 350 MHz 4/8 62/31 MHz
1011_100 100 MHz 2.5 250 MHz 4 400 MHz 4/8 62/31 MHz
1
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.
2
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.). Refer to Ta bl e 1 5 .
3
In this mode, PCI_MODCK must be “0”.
Table 18. Clock Default Configurations in PCI Agent Mode (MODCK_HI = 0000)
MODCK[1–3]
1
Input Clock
Frequency
(PCI)
2
CPM
Multiplication
Factor
2
CPM
Frequency
Core
Multiplication
Factor
Core
Frequency
3
Bus Division
Factor
60x Bus
Frequency
4
000 66/33 MHz 2/4 133 MHz 2.5 166 MHz 2 66 MHz
001 66/33 MHz 2/4 133 MHz 3 200 MHz 2 66 MHz
010 66/33 MHz 3/6 200 MHz 3 200 MHz 3 66 MHz
011 66/33 MHz 3/6 200 MHz 4 266 MHz 3 66 MHz
Table 17. Clock Configuration Modes in PCI Host Mode (continued)
MODCK_H –
MODCK[1–3]
Input Clock
Frequency
1
(Bus)
CPM
Multiplication
Factor
CPM
Frequency
Core
Multiplication
Factor
Core
Frequency
PCI Division
Factor
2
PCI
Frequency
2