Freescale Semiconductor MPC8260 - Manual (Page 1194)

ATM Transmission Convergence Layer
MPC8260 PowerQUICC II Family Reference Manual, Rev. 2
34-16 Freescale Semiconductor
Figure 34-12. Example of Serial ATM Application
34.5.1 Operating the TC Layer at Higher Frequencies
The operation of the TC layer requires a minimum frequency ratio of 1:2.5 between the serial clock and
the UTOPIA clock (in Rx and Tx separately). Using the TC for serial frequencies greater than 10 MHz
requires using higher UTOPIA frequencies to preserve that ratio.
34.5.2 Programming a T1 Application
This section describes the configurations necessary to implement a T1 application using a single TC layer
block. Note that using two or more TCs requires FCC2 to work in MPHY mode. Assuming that the
required ATM parameters and data structures have been setup and initialized, implementing a T1
application requires the following steps:
1. Program FCC2
2. Setup I/O Ports and Clocks
3. Enable Tx/Rx on FCC2
4. Program CPM MUX
5. Program the TC block
FCC2
SI-2
4 channel
T1
PHY
TC
FCC1
UTOPIA 8-bit bus
UTOPIA 16-bit bus
DPR
SONET
155 mbps
PHY
4*1.5 mbps 8*1.5 mbps
TDMa
TDMb
TDMc
TDMd
TDMa
TDMb
TDMc
TDMd
SI-1
Framer
4 channel
T1
PHY
4*1.5 mbps
Framer
PowerQUICC II