MPC8280 datasheet(616/1386 Pages) FREESCALE

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CPM Multiplexing

MPC8280 PowerQUICC II Family Reference Manual, Rev. 1

16-4

Freescale Semiconductor

Figure 16-2. Enabling Connections to the TSA

16.3

NMSI Configuration

The CMX supports an NMSI mode for each of the FCCs, SCCs, and SMCs. Each serial device is

connected independently either to the NMSI or to the TSA using the clock route registers. The user should

note, however, that NMSI pins are multiplexed with other functions at the parallel I/O lines. Therefore, if

a combination of TDM and NMSI channels are used, consult the MPC8280’s pinout to determine which

FCC, SCC, and SMC to connect and where to connect them.

The clocks provided to the FCCs, SCCs, and SMCs are derived from a bank of 8 internal BRGs and 20

external CLK pins; see Figure 16-3. There are two main advantages to the bank-of-clocks approach. First,

a serial device is not forced to choose a serial device clock from a predefined pin or BRG; this allows a

flexible pinout-mapping strategy. Second, a group of serial receivers and transmitters that needs the same

clock rate can share the same pin. This configuration leaves additional pins for other functions and

minimizes potential skew between multiple clock sources.

SI RAMs

Time-Slot

Assigners

TDM a,b,c,d Enable = 1

TDM a Pins

TDM b Pins

TDM c Pins

TDM d Pins

FCC1

FCC2

FCC3

SCC1

SCC2

SCC3

SCC4

SMC1

SMC2

MII1/UTOPIA 8/16/M-phy

FC1 = 0

MII2/UTOPIA 8/M-phy

FC2 = 00

MII3

FC3 = 0

SCC1 Pins

SC1 = 0

SCC2 Pins

SC2 = 0

SCC3 Pins

SC3 = 0

SCC4 Pins

SC4 = 0

SMC1 Pins

SMC1 = 0

SMC2 Pins

SMC2 = 0

MCCs

TDM a channels

TDM b channels

TDM c channels

TDM d channels

MPC8280 Datasheet(PDF) 616 Page - Freescale Semiconductor, Inc

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