Freescale Semiconductor MPC8260 - Manual (Page 101)

Overview
MPC8260 PowerQUICC II Family Reference Manual, Rev. 2
Freescale Semiconductor 1-7
Figure 1-1. PowerQUICC II Block Diagram
Both the system core and the CPM have an internal PLL, which allows independent optimization of the
frequencies at which they run. The system core and CPM are both connected to the 60x bus.
1.2.1 G2 Core
The G2 core is derived from the MPC603e microprocessor with power management modifications. The
core is a high-performance low-power implementation of the family of reduced instruction set computer
(RISC) microprocessors. The G2 core implements the 32-bit portion of the PowerPC architecture, which
provides 32-bit effective addresses, integer data types of 8, 16, and 32 bits. The G2 cache provides
snooping to ensure data coherency with other masters. This helps ensure coherency between the CPM and
system core.
The core includes 16 Kbytes of instruction cache and 16 Kbytes of data cache. It has a 64-bit
split-transaction external data bus, which is connected directly to the external PowerQUICC II pins.
16 Kbytes
G2 Core
I-Cache
I-MMU
16 Kbytes
D-Cache
D-MMU
Communication Processor Module (CPM)
Timers
Parallel I/O
Baud Rate
Generators
32-bit RISC Microcontroller
and Program ROM
Serial
DMAs
60x-to-PCI
Bridge
2
Bridge
Memory Controller
Clock Counter
System Functions
System Interface Unit
(SIU)
Local Bus 3
32 bits
PCI Bus 2
32 bits, up to 66 MHz
or
MCC1
6,7
MCC2 FCC1 FCC2 FCC3
7
SCC1 SCC2 SCC3 SCC4 SMC1 SMC2 SPI I 2 C
Serial Interface
3 MII 2 UTOPIA
Ports 6 Ports 9
60x Bus
Microcode
IMA 4
Interrupt
Controller
Time Slot Assigner TC Layer Hardware 4
8 TDM Ports 8 Non-Multiplexed
I/O
60x-to-Local
Bus Interface Unit
Notes:
1
24 Kbytes on .29 µm (HiP3) devices/ 32 Kbytes on .25µm (HiP4) devices
2
MPC8250, MPC8265, and MPC8266 only
3
Up to 66 MHz on .29
µm devices/ Up to 83 MHz on .25µm devices
4
MPC8264 and MPC8266 only
5
2 on .29 µm devices/ 4 on .25µm devices
Virtual
IDMAs 5
Dual-Port RAM
1
6
Not on the MPC8250
7 Not on the MPC8255
8
4 on the MPC8250 and MPC8255
9
2 on the MPC8255