TMS320DM355 datasheet(87/158 Pages) TI

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3.14 64-Bit Crossbar Architecture

3.14.1 Crossbar Connections

3.14.2 EDMA Controller

TMS320DM355

Digital Media System-on-Chip (DMSoC)

SPRS463B – SEPTEMBER 2007 – REVISED OCTOBER 2007

The DM355 uses a 64-bit crossbar architecture to control access between device processors, subsystems

and peripherals. It includes an EDMA Controller consisting of a DMA Transfer Controller (TC) and a DMA

Channel Controller (CC). The TC provides two DMA channels for transfer between slave peripherals. The

CC provides a user and event interface to the EDMA system. It includes up to 64 event channels to which

all system synchronization events can be mapped and 8 auto submit “quick” channels (QDMA). In most

ways, these channels are identical. A channel refers to a specific ‘event’ that can cause a transfer to be

submitted to the TC as a Transfer Request.

There are five transfer masters (TCs have separate read and write connections) connected to the

crossbar; ARM, the Video Processing Sub-system (VPSS), the master peripherals (USB), and two EDMA

transfer controllers. These can be connected to four separate slave ports; ARM, the DDR EMIF, and CFG

bus peripherals. Not all masters may connect to all slaves. Connection paths are indicated by

√ at

intersection points shown in Table 3-18

Table 3-18. Crossbar Connection Matrix

Slave Module

DMA Master

ARM Internal

MPEG/JPEG

Config Bus Registers and

DDR EMIF Memory

Memory

Co-processor

Memory

ARM

√

VPSS

√

DMA Master Peripherals (USB)

√

EDMA3TC0

√

EDMA3TC1

√

The EDMA controller handles all data transfers between memories and the device slave peripherals on

the DM355 device. These are summarized as follows:

• Transfer to/from on-chip memories

–

ARM program/data RAM

–

MPEG/JPEG Co-processor memory

• Transfer to/from external storage

–

DDR2 / mDDR SDRAM

–

Asynchronous EMIF

–

OneNAND flash

–

NAND flash

–

Smart Media, SD, MMC, xD media storage

• Transfer to/from peripherals

–

ASP

–

SPI

–

I2C

–

PWM

–

RTO

–

GPIO

–

Timer/WDT

–

UART

–

MMC/SD

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