MPC8280 datasheet(619/1386 Pages) FREESCALE

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CPM Multiplexing

MPC8280 PowerQUICC II Family Reference Manual, Rev. 1

Freescale Semiconductor

16-7

NOTE

After a clock source is selected, the clock is given an internal name. For the

FCCs and SCCs, the names are RCLKx and TCLKx; for SMCs, the name is

simply SMCLKx. These internal names are used only in NMSI mode to

specify the clocks sent to the FCCs, SCCs or SMCs. These names do not

correspond to any MPC8280 pins.

16.4

CMX Registers

The following sections describe the CMX registers.

16.4.1

CMX UTOPIA Address Register (CMXUAR)

NOTE

This section does not apply to the MPC8270.

The CMX UTOPIA address register (CMXUAR), shown in Figure 16-4, defines the connection of FCC1

and FCC2 UTOPIA multiple-PHY addresses to the twenty UTOPIA address pins of the MPC8280; it also

defines the connection of a BRG to the FCCs when an internal rate feature is used. This enables the user

to implement a multiple-PHY UTOPIA master or slave on both FCC1 and FCC2 using only twenty pins.

The user chooses how many PHYs to use with each interface and how many address lines are needed for

each FCC.

Table 16-2 describes CMXUAR fields.

01234

Field SAD0 SAD1 SAD2 SAD3 SAD4

—

MAD4 MAD3

F1IRB

F2IRB

—

Reset

0000_0000_0000_0000

R/W

Addr

0x11B0E

Figure 16-4. CMX UTOPIA Address Register (CMXUAR)

Table 16-2. CMXUAR Field Descriptions

Bits

Name

Description

0–4

SAD

Slave address input pin

x connection. Note that the address indexes are relative to FCC1; see

Figure 16-7.

0 This address input pin is used by FCC2 in slave mode.

1 This address input pin is used by FCC1 in slave mode.

—

Reserved, should be cleared.

6–7

MAD

Master address output pin

x connection. Note that the address indexes are relative to FCC1; see

Figure 16-7.

0 This address output pin is used by FCC2 in master mode.

1 This address output pin is used by FCC1 in master mode.

Note: Setting both MAD3 and MAD4 to 1 enables a special extended PHY mode (see Section

31.12.3, “Extended Number of PHYs”).

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