DRA790 Datasheet, PDF (335/436 Pages) Texas Instruments – Infotainment Applications Processor

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DRA790, DRA791
DRA793, DRA797
SPRS968A – AUGUST 2016 – REVISED FEBRUARY 2017
6.7 Memory Subsystem
6.7.1 EMIF
The EMIF module provides connectivity between DDR memory types and manages data bus read/write
accesses between external memory and device subsystems which have master access to the L3_MAIN
interconnect and DMA capability.
The EMIF module has the following capabilities:
• Supports JEDEC standard-compliant DDR3/DDR3L-SDRAM memory types
• 2-GiB SDRAM address range over one chip-select. This range is configurable through the dynamic
memory manager (DMM) module
• Supports SDRAM devices with one, two, four or eight internal banks
• Supports SDRAM devices with single or dual die packages
• Data bus widths:
– 128-bit L3_MAIN (system) interconnect data bus width
– 128-bit port for direct connection with MPU subsystem
– 32-bit SDRAM data bus width
– 16-bit SDRAM data bus width used in narrow mode
• Supported CAS latencies:
– DDR3: 5, 6, 7, 8, 9, 10 and 11
• Supports 256-, 512-, 1024-, and 2048-word page sizes
• Supported burst length: 8
• Supports sequential burst type
• SDRAM auto initialization from reset or configuration change
• Supports self refresh and power-down modes for low power
• Partial array self-refresh mode for low power.
• Output impedance (ZQ) calibration for DDR3
• Supports on-die termination (ODT) DDR3
• Supports prioritized refresh
• Programmable SDRAM refresh rate and backlog counter
• Programmable SDRAM timing parameters
• Write and read leveling/calibration and data eye training for DDR3.
The EMIF module does not support:
• Burst chop for DDR3
• Interleave burst type
• Auto precharge because of better Bank Interleaving performance
• DLL disabling from EMIF side
• SDRAM devices with more than one die, or topologies which require more than one chip select on a
single EMIF channel
For more information, see section DDR External Memory Interface (EMIF) in chapter Memory Subsystem
of the device TRM.
6.7.2 GPMC
The General Purpose Memory Controller (GPMC) is an external memory controller of the device. Its data
access engine provides a flexible programming model for communication with all standard memories.
The GPMC supports the following various access types:
• Asynchronous read/write access
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