MPC862_06 datasheet(2/88 Pages) FREESCALE

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MPC862/857T/857DSL PowerQUICC™ Family Hardware Specifications, Rev. 3

Freescale Semiconductor

Overview

1Overview

The MPC862/857T/857DSL is a derivative of Freescale’s MPC860 PowerQUICC™ family of devices. It

is a versatile single-chip integrated microprocessor and peripheral combination that can be used in a

variety of controller applications and communications and networking systems. The

MPC862/857T/857DSL provides enhanced ATM functionality over that of other ATM-enabled members

of the MPC860 family.

Table 1 shows the functionality supported by the members of the MPC862/857T/857DSL family.

2Features

The following list summarizes the key MPC862/857T/857DSL 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 cache (MPC862P) is four-way, set-associative with 256 sets; 4-Kbyte

instruction cache (MPC862T, MPC857T, and MPC857DSL) is two-way, set-associative

with 128 sets.

– 8-Kbyte data cache (MPC862P) is two-way, set-associative with 256 sets; 4-Kbyte data

cache (MPC862T, MPC857T, and MPC857DSL) 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

Table 1. MPC862 Family Functionality

Part

Cache

Ethernet

SCC

SMC

Instruction

Cache

Data Cache

10T

10/100

MPC862P

16 Kbyte

8 Kbyte

Up to 4

MPC862T

4 Kbyte

Up to 4

MPC857T

4 Kbyte

MPC857DSL

4 Kbyte

1 1

On the MPC857DSL, the SCC (SCC1) is for ethernet only. Also, the MPC857DSL does

not support the Time Slot Assigner (TSA).

1 2

On the MPC857DSL, the SMC (SMC1) is for UART only.

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