MPC866 datasheet(2/96 Pages) FREESCALE

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MPC866/MPC859 Hardware Specifications, Rev. 2

Freescale Semiconductor

Features

Table 1 shows the functionality supported by the members of the MPC866/859 family.

2Features

The following list summarizes the key MPC866/859 features:

•

Embedded single-issue, 32-bit PowerPC™ core (implementing the PowerPC architecture) with

thirty-two 32-bit general-purpose registers (GPRs)

— The core performs branch prediction with conditional prefetch, without conditional execution

— 4- or 8-Kbyte data cache and 4- or 16-Kbyte instruction cache (see Table 1)

– 16-Kbyte instruction cache (MPC866P and MPC859P) is four-way, set-associative with 256 sets;

4-Kbyte instruction cache (MPC866T, MPC859T, and MPC859DSL) is two-way, set-associative

with 128 sets.

– 8-Kbyte data cache (MPC866P and MPC859P) is two-way, set-associative with 256 sets; 4-Kbyte

data cache(MPC866T, MPC859T, and MPC859DSL) is two-way, set-associative with 128 sets.

– Cache coherency for both instruction and data caches is maintained on 128-bit (4-word) cache

blocks

– Caches are physically addressed, implement a least recently used (LRU) replacement algorithm, and

are lockable on a cache block basis.

— MMUs with 32-entry TLB, fully associative instruction and data TLBs

— MMUs support multiple page sizes of 4, 16, and 512 Kbytes, and 8 Mbytes; 16 virtual address spaces

and 16 protection groups.

— Advanced on-chip-emulation debug mode

•

The MPC866/859 provides enhanced ATM functionality over that of the MPC860SAR. The MPC866/859

adds major new features available in 'enhanced SAR' (ESAR) mode, including the following:

— Improved operation, administration, and maintenance (OAM) support

— OAM performance monitoring (PM) support

— Multiple APC priority levels available to support a range of traffic pace requirements

Table 1. MPC866 Family Functionality

Part

Cache

Ethernet

SCC

SMC

Instruction

Data

10T

10/100

MPC866P

16 Kbytes

8 Kbytes

Up to 4

MPC866T

4 Kbytes

Up to 4

MPC859P

16 Kbytes

8 Kbytes

1112

MPC859T

4 Kbytes

1112

MPC859DSL

4 Kbytes

1 1

On the MPC859DSL, the SCC (SCC1) is for ethernet only. Also, the MPC859DSL does not support the Time Slot

Assigner (TSA).

1 2

On the MPC859DSL, the SMC (SMC1) is for UART only.

MPC852T 3

For more details on the MPC852T, please refer to the

MPC852T Hardware Specifications.

4 KBytes

4 Kbytes

2121

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