DRA790 Datasheet, PDF (354/436 Pages) Texas Instruments – Infotainment Applications Processor

DRA790, DRA791
DRA793, DRA797
SPRS968A – AUGUST 2016 – REVISED FEBRUARY 2017
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The eMMC/SD/SDIO host controller deals with eMMC/SD/SDIO protocol at transmission level, data
packing, adding cyclic redundancy checks (CRCs), start/end bit, and checking for syntactical correctness.
The application interface can send every eMMC/SD/SDIO command and poll for the status of the adapter
or wait for an interrupt request, which is sent back in case of exceptions or to warn of end of operation.
The application interface can read card responses or flag registers. It can also mask individual interrupt
sources. All these operations can be performed by reading and writing control registers. The
eMMC/SD/SDIO host controller also supports two DMA channels.
There are four eMMC/SD/SDIO host controllers inside the device. gives an overview of the
eMMC/SD/SDIOi (i = 1 to 4) controllers.
Each controller has the following data width:
• eMMC/SD/SDIO1 - 4-bit wide data bus
• eMMC/SD/SDIO2 - 8-bit wide data bus
• eMMC/SD/SDIO3 - 4-bit wide data bus
• eMMC/SD/SDIO4 - 4-bit wide data bus
The eMMC/SD/SDIOi controller is also referred to as MMCi.
Compliance with standards:
• Full compliance with MMC/eMMC command/response sets as defined in the JC64 MMC/eMMC
standard specification, v4.5.
• Full compliance with SD command/response sets as defined in the SD Physical Layer specification
v3.01
• Full compliance with SDIO command/response sets and interrupt/read-wait suspend-resume
operations as defined in the SD part E1 specification v3.00
• Full compliance with SD Host Controller Standard Specification sets as defined in the SD card
specification Part A2 v3.00
Main features of the eMMC/SD/SDIO host controllers:
• Flexible architecture allowing support for new command structure
• 32-bit wide access bus to maximize bus throughput
• Designed for low power
• Programmable clock generation
• Dedicated DLL to support SDR104 mode (MMC1 only)
• Dedicated DLL to support HS200 mode (MMC2 only)
• Card insertion/removal detection and write protect detection
• L4 slave interface supports:
– 32-bit data bus width
– 8/16/32 bit access supported
– 9-bit address bus width
– Streaming burst supported only with burst length up to 7
– WNP supported
• L3 initiator interface Supports:
– 32-bit data bus width
– 8/16/32 bit access supported
– 32-bit address bus width
– Burst supported
• Built-in 1024-byte buffer for read or write
• Two DMA channels, one interrupt line
• Support JC 64 v4.4.1 boot mode operations
354 Detailed Description
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