CPM Multiplexing
MPC8260 PowerQUICC II Family Reference Manual, Rev. 2
Freescale Semiconductor 16-5

Figure 16-3. Bank of Clocks

The eight BRGs also make their clocks available to external logic, regardless of whether the BRGs are being used by a serial device. Notice that the BRG outputs are multiplexed with other functions; thus, all BRGOx pins may not always be available. Chapter 40, “Parallel I/O Ports,” shows the function multiplexing.There are two restrictions in the bank-of-clocks mapping: Only four of the twenty sources can be connected to any given FCC or SCC receiver or transmitter. The SMC transmitter and receiver share the same clock source when connected to the NMSI.Table16-1 shows the clock source options for the serial controllers and TDM channels.
BRG1 BRG2 BRG3 BRG4
CLK1
CLK2
BRGO1
BRGO2
BRGO3
BRGO4
Bank of Clocks
Selection Logic
CLK3
CLK4
CLK5
CLK6
CLK7
CLK8
CLK9
CLK10
CLK11
CLK12
CLK13
CLK14
CLK15
CLK16
BRG5 BRG6 BRG7 BRG8
BRGO5
BRGO6
BRGO7
BRGO8
FCC1 Tx
CLK17
CLK18
CLK19
CLK20
(Partially filled cross-switch logic
programmed in the CMX registers.)
Rx
FCC2 Tx
Rx
FCC3 Tx
Rx
SCC1 Tx
Rx
SCC2 Tx
Rx
SCC3 Tx
Rx
SCC4 Tx
Rx
SMC1
SMC2
TDMA1
TxRx
TDMB1
TxRx
TDMC1
TxRx
TDMD1
TxRx
TDMA2
TxRx
TDMB2
TxRx
TDMC2
TxRx
TDMD2
TxRx