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3. TECHNICAL BRIEF
3.9 External memory interface
The MSM6281 device was designed to provide two distinct memory interfaces. EBI1 was targeted for
supporting high speed synchronous memory devices. EBI2 was targeted towards supporting slower
asynchronous devices such as LCD, NAND flash, SRAM, etc.
In addition, MSM6281 provide SD bus interface. CU920/CU915 supports Micro-SD using SD interface.
• EBI1 Features
- 16 bit static and dynamic memory interface
- 32 bit dynamic memory interface
- 24 bits of address for static memory devices which can support up to 32MBytes on each chip select
- Synchronous burst memories supported (burst NOR, burst PSRAM)
- Synchronous DRAM memories supported
- Byte addressable memory supporting 8 bit, 16 bit and 32 bit accesses
- Pseudo SRAM (PSRAM) memory support
• EBI2 Features
- Support for asynchronous FLASH and SRAM(16bit & 8bit).
- Interface support for byte addressable 16bit devices (UB_N & LB_N signals).
- 2Mbytes of memory per chip select.
- Support for 8 bit/16bit wide NAND flash.
- Support for parallel LCD interfaces, port mapped of memory mapped(18 or 16 bit).
• 2Gb NAND(8bit) flash memory + 1Gb SDRAM (32bit)
• 1-CS(Chip Select) are used.
• The SD bus allows the dynamic configuration of the number of data line from 1 to 4 Bidirectional data
signal. After power up by default, the Device will use only DAT0. After initialization, host can change
the bus width.
LGE Internal Use Only
Copyright © 2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
Interface Spec
Device Part Name Maker Read Access Time Write Access Time
FLASH TYA000BC00HOGG Toshiba 35 ns 30 ns
SDRAM TYA000BC00HOGG Toshiba 30 ns 15 ns
Table. 3.13.1 External memory interface
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