MPC855 datasheet(2/76 Pages) MOTOROLA

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MPC860 Family Hardware Speciﬁcations

MOTOROLA

Features

MPC8xx core that incorporates memory management units (MMUs) and instruction and

data caches and that implements the PowePC instruction set. The communications

processor module (CPM) from the MC68360 QUICC has been enhanced by the addition of

the inter-integrated controller (I2C) channel. The memory controller has been enhanced,

enabling the MPC860 to support any type of memory, including high-performance

memories and new types of DRAMs. A PCMCIA socket controller supports up to two

sockets. A real-time clock has also been integrated.

Table 1 shows the functionality supported by the members of the MPC860 family.

Part II Features

The following list summarizes the key MPC860 features:

•

Embedded single-issue, 32-bit MPC8xx 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 caches are four-way, set-associative with 256 sets;

4-Kbyte instruction caches are two-way, set-associative with 128 sets.

– 8-Kbyte data caches are two-way, set-associative with 256 sets; 4-Kbyte data

caches are two-way, set-associative with 128 sets.

– Cache coherency for both instruction and data caches is maintained on 128-bit

(4-word) cache blocks.

Table 1. MPC860 Family Functionality

Part

Cache (Kbytes)

Ethernet

ATM

SCC

Ref. 1

Supporting documentation for these devices refers to the following:

1. MPC860 PowerQUICC User’s Manual (MPC860UM/D, Rev. 1).

2. MPC8XX ATM Supplement (MPC860SARUM/AD).

3. MPC860T (Rev. D), Fast Ethernet Controller Supplement (MPC860TREVDSUPP).

4. MPC855T User’s Manual (MPC855TUM/D, Rev. 1).

Instruction

Cache

Data Cache

10T

10/100

MPC860DE

Up to 2

—

MPC860DT

Up to 2

yes

1,2,3

MPC860DP

Up to 2

yes

1,2,3

MPC860EN

Up to 4

—

MPC860SR

Up to 4

—

yes

1,2

MPC860T

Up to 4

yes

1,2,3

MPC860P

Up to 4

yes

1,2,3

MPC855T

yes

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