Overview
MPC8260 PowerQUICC II Family Reference Manual, Rev. 2
Freescale Semiconductor 1-3
Three user programmable machines, general-purpose chip-select machine, and page mode
pipeline SDRAM machine
Byte selects for 64-bit bus width (60x) and for 32-bit bus width (local)
Dedicated interface logic for SDRAM
Disable CPU mode
Communications processor module (CPM)
Embedded 32-bit communications processor (CP) uses a RISC architecture for flexible support
for communications peripherals
Interfaces to G2 core through on-chip dual-port RAM and DMA controller. (Dual-port RAM
size is 24 Kbyte on 0.29µm (HiP3) silicon and 32Kbyte on 0.25µ m (HiP4) silicon.)
Serial DMA channels for receive and transmit on all serial channels
Parallel I/O registers with open-drain and interrupt capability
Virtual DMA functionality executing memory to memory and memory to I/O transfers
Three fast communication controllers (FCCs) (two on the MPC8255) supporting the following
protocols
10/100-Mbit Ethernet/IEEE 802.3 CDMA/CS interface through media independent
interface (MII)
ATM (not on MPC8250)—full-duplex SAR at 155 Mbps, UTOPIA interface, AAL5,
AAL1, AAL0 protocols, TM 4.0 CBR, VBR, UBR, ABR traffic types, up to 64 K external
connections
– Transparent
HDLC—up to T3 rates (clear channel)
Two multichannel controllers (MCCs) (only MCC2 on the MPC8250 and the MPC8255)
Two 128 serial full-duplex data channels (for a total of 256 64 Kbps channels). Each MCC
can be split into four subgroups of 32 channels each.
Almost any combination of subgroups can be multiplexed to single or multiple TDM
interfaces
Four serial communications controllers (SCCs) identical to those on the MPC860, supporting
the digital portions of the following protocols:
Ethernet/IEEE 802.3 CDMA/CS
HDLC/SD LC and HDLC bus
Universal asynchronous receiver transmitter (UART)
Synchronous UART
Binary s ynchronous (BiSync) communications
– Transparent
Two serial management controllers (SMCs), identical to those of the MPC860
Provide managem ent for BRI devices as general-circuit interface (GCI) controllers in time-
division-multiplexed (TDM) channels