Motorola PowerQUICC II MPC8280 Series Reference Manual page 1303

MPC8280
SONET
155 mbps
PHY
PHY
4*1.5 mbps
TDMa
4 channel
TDMb
T1
TDMc
Framer
TDMd
TDMa
4 channel
TDMb
T1
TDMc
Framer
TDMd
PHY
4*1.5 mbps
Figure 35-12. Example of Serial ATM Application
35.5.1 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.
35.5.2 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
MOTOROLA
Freescale Semiconductor, Inc.
UTOPIA 16-bit bus
UTOPIA 8-bit bus
SI-1
TC
SI-2
Chapter 35. ATM Transmission Convergence Layer
For More Information On This Product,
Go to: www.freescale.com
Implementation Example
FCC1
FCC2
8*1.5 mbps
DPR
35-17