MPC8275VR datasheet(34/76 Pages) MOTOROLA

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MPC8280 PowerQUICC II™ Family Hardware Speciﬁcations

MOTOROLA

Clock Conﬁguration Modes

7.3

PCI Agent Mode

Table 18 and Table 19 show conﬁgurations for PCI agent mode. The frequencies listed 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. In addition, note the following:

NOTE: PCI_MODCK

In PCI mode only, PCI_MODCK comes from the LGPL5 pin and

MODCK_H[0–3] comes from {LGPL0, LGPL1, LGPL2, LGPL3}.

NOTE: Tval (Output Hold)

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.

1 “Low” values are the minimum allowable frequencies for a given clock mode. The minimum bus frequency guarantees the

required minimum CPU operating frequency. Minimum CPU frequency is determined by the clock mode.

For modes with a CPU multiplication factor

≤ 3, the minimum CPU frequency is 166 MHz. The minimum CPM frequency

is 133 MHz.

For modes with a CPU multiplication factor

≥ 3.5, the minimum CPU frequency is 250 MHz. The minimum CPM frequency

is as shown in the table.

“High” values 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.

2 As Table 14 shows, PCI_MODCK determines the PCI clock frequency range. Refer to Table 16 for higher conﬁgurations.

3 MODCK_H = hard reset conﬁguration word [28–31]. MODCK[1-3] = three hardware conﬁguration pins.

4 60x and local bus frequency. Identical to CLKIN.

5 CPM multiplication factor = CPM clock/bus clock

6 CPU multiplication factor = Core PLL multiplication factor

Table 18. Clock Conﬁgurations for PCI Agent Mode (PCI_MODCK=0)1,2

Mode3

PCI Clock

(MHz)

CPM

Multiplication

Factor4

CPM Clock

(MHz)

CPU

Multiplication

Factor5

CPU Clock

(MHz)

Bus

Division

Factor

Bus Clock

(MHz)

MODCK_H-

MODCK[1-3]

low

high

low

high

low

high

low

high

Default Modes (MODCK_H=0000

0000_000

66.7

133.3 133.3

2.5

166.7 166.7

66.7

0000_001

66.7

133.3 133.3

200.0 200.0

66.7

0000_010

55.5

66.7

166.7 200.0

55.5

66.7

0000_011

62.5

66.7

187.5 200.0

250.0 266.6

62.5

66.7

0000_100

50.0

66.7

150.0 200.0

180.0 240.0

2.5

60.0

80.0

0000_101

59.5

66.7

178.6 200.0

3.5

250.0 280.0

2.5

71.4

80.0

0000_110

53.6

66.7

214.3 266.6

3.5

250.0 311.1

71.4

88.9

0000_111

50.0

66.7

200.0 266.6

240.0 320.0

2.5

80.0

106.7

Full Conﬁguration Modes

0001_001

Reserved

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