DSP56857 datasheet(56/662 Pages) FREESCALE

tên linh kiện	DSP56857

Giải thích chi tiết về linh kiện	Digitial Signal Controller

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System Bus Controller

5685X Digital Signal Controller User Manual, Rev. 4

1-24

Freescale Semiconductor

1.5.2.1 System Side Operation

On the system side, the IPBus Bridge operates at core frequency and fully supports pipelined

communication with the core. The bridge acts as a slave device on this bus. The bridge is

responsible for initiating IPBus transactions only per requests initiated by the core, or other

system bus masters.

Figure 1-8. IPBus Bridge Interface With Other Main Components

System Side Operation

1.5.2.2 Peripheral Side Operation

On the peripheral side, the IPBus Bridge accesses various devices through a standard

non-pipelined IPBus interface. Separate bus lines are used for read and write transactions. The

IPBus Bridge also interfaces with an External Memory Interface (EMI) block. The IPBus

operates at half of the core frequency.

X1 DATA

56800E

CORE

416

XAB1

CDBR

CDBW

X2 DATA

RAM

1-1/2 PORT

XAB2

XDB2

PROGRAM

RAM

PAB

PDB

IPB_RDATA

IPB_WDATA

IPB_ADDR

RAM

IPB_R/W

EMI

INTERFACE

IPBus

BRIDGE

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