MPC8275VR datasheet(56/76 Pages) MOTOROLA

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MPC8280 PowerQUICC II™ Family Hardware Speciﬁcations

MOTOROLA

Pinout

Symbols used in Table 20 are described in Table 21.

8.2

VR and ZQ Packages—MPC8275 and MPC8270

The following ﬁgures and table represent the alternate 516 PBGA package. For information on the standard

package for the MPC8280 and the MPC8270, refer to Section 8.1, “ZU Package—MPC8280 and

MPC8270” on page 41.

Figure 15 shows the pinout of the VR and ZQ packages as viewed from the top surface.

6 GNDSYN (AB1): This pin exists as a separate ground signal in MPC826x(A) devices; it does not exist as a separate

ground signal on the MPC8280. New designs must connect AB1 to GND and follow the suggestions in Section 4.3,

“Layout Practices.” Old designs in which the MPC8280 is used as a drop-in replacement can leave the pin connected

to GND with the noise ﬁltering capacitors.

7 XFC (AB2) pin: This pin is used in MPC826x(A) devices; it is not used in MPC8280 because there is no need for

external capacitor to operate the PLL. New designs should connect AB2 (XFC) pin to GND. Old designs in which the

MPC8280 is used as a drop-in replacement can leave the pin connected to the current capacitor.

Table 21. Symbol Legend

Symbol

Meaning

OVERBAR

Signals with overbars, such as TA, are active low.

UTM

Indicates that a signal is part of the UTOPIA master interface.

UTS

Indicates that a signal is part of the UTOPIA slave interface.

UT8

Indicates that a signal is part of the 8-bit UTOPIA interface.

UT16

Indicates that a signal is part of the 16-bit UTOPIA interface.

MII

Indicates that a signal is part of the media independent interface.

RMII

Indicates that a signal is part of the reduced media independent interface.

MPC8275VR 数据表(PDF) 56 Page - Motorola, Inc