Freescale Semiconductor MPC8260 - Manual (Page 1179)

MPC8260 PowerQUICC II Family Reference Manual, Rev. 2
Freescale Semiconductor 34-1
Chapter 34
ATM Transmission Convergence Layer
NOTE
The functionality described in this chapter is available only on the
MPC8264 and the MPC8266.
The PowerQUICC II can support applications which receive ATM traffic over the standard serial protocols
like E1, T1, and xDSL via its serial interface (SIx TDMx) ports because the ATM TC-layer functionality
is implemented internally. This allows the use of standard low-cost PHY devices in system applications
instead of PHYs that support UTOPIA bus devices.
A typical TC layer application requires the use of one SI TDM channel per TC block. As shown in
Figure 34-1 , all TC blocks are internally connected to FCC2. In addition, Figure 34-1 shows FCC1
connected to a UTOPIA 16-bit MPHY bus which can be routed outside and operated independently of the
TC blocks.
Figure 34-1. Serial ATM Using FCC2 and TC Blocks (Single Channel)
34.1 Features
Primary features of the TC layer include the following:
• Eight TDM channels routed in hardware to eight TC layer blocks
FCC2
FCC1
UTOPIA level-2 8-/16-bit bus
DPR TDMx
FCC3
TC
SIx
UTOPIA level-2 8-bit bus
Blocks