Texas Instruments TMS320DM355 warranty 14 64-Bit Crossbar Architecture, Crossbar Connections

TMS320DM355

Digital Media System-on-Chip (DMSoC)

www.ti.com

SPRS463A –SEPTEMBER 2007 –REVISED SEPTEMBER 2007

3.14 64-Bit Crossbar Architecture

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

CCprovides 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.

3.14.1Crossbar Connections

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
		Memory
ARM	√	√	√	√
VPSS				√
DMA Master Peripherals (USB)	√			√
EDMA3TC0	√	√	√	√
EDMA3TC1	√	√	√	√

3.14.2 EDMA Controller

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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