AN2584 Freescale Semiconductor / Motorola, AN2584 Datasheet - Page 4

• Manufacturer Part Number: AN2584
• Description: Migrating from the MPC852T to the MPC875
• Manufacturer: Freescale Semiconductor / Motorola

Similarities and Differences between MPC852T and MPC875
Similarities and Differences between MPC852T and MPC875
two SCCs (SCCs 3&4), SMC1, and the SPI. The SCCs can support 802.3 Ethernet, HDLC/SDLC, UART,
and transparent protocols.
5 Similarities and Differences between MPC852T and
The following sections discuss MPC852T and MPC875 differences for pinout and memory mapping.
5.1 Pinout
Both the MPC852T and the MPC875 use the 256 plastic ball grid array (PBGA) package. Buses and other
functions were grouped in a logical order, but reuse of layout is not available. Parallel ports changed from
four (Port A, B, C, and D) on the MPC852T to five (Port A, B, C, D, and E) on the MPC875. Each signal
in the I/O ports can be configured as a general-purpose I/O signal or as a signal dedicated to supporting
communications peripherals, such as Ethernet or USB. See the MPC885 PowerQUICC Family Users
Manual for more information.
4
MPC875
Fast Ethernet
Media Access
Embedded
Processor
Controller
MPC8xx
Base-T
Control
DMAs
FIFOs
10/100
Core
MII
Load/Store
Instruction
Bus
Bus
Freescale Semiconductor, Inc.
2 Baud Rate
Migrating from the MPC852T to the MPC875
Generators
Parallel I/O
For More Information On This Product,
Instruction Cache
Instruction MMU
32-Entry DTLB
32-Entry ITLB
Data Cache
Figure 2. MPC852T Block Diagram
Data MMU
4-Kbyte
4-Kbyte
Go to: www.freescale.com
Timers
Timers
2
SCC3
32-Bit RISC Controller
Controllers
and Program
Interrupt
Unified
SCC4
ROM
Bus
Dual-Port RAM
SMC1
8-Kbyte
System Interface Unit (SIU)
Bus Interface
Internal
Memory Controller
PCMCIA-ATA Interface
Unit
SPI
System Functions
Bus Interface
Channels
1 Virtual
8 Serial
External
IDMA
DMA
Unit
&
MOTOROLA