External Memory Interface - LG L705i Service Manual

3.10. External memory interface

A. MSM6280
The MSM6280 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.
• 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(16bit) flash memory + 1Gb SDRAM (32bit)
• 1-CS(Chip Select) is used
Device
FLASH TYA000BC00DOGG
SDRAM TYA000BC00DOGG
Copyright © 2007 LG Electronics. Inc. All right reserved.
Only for training and service purposes
Interface Spec
Part Name Maker
Toshiba
Toshiba
Table#1. External memory interface for L705i
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3. TECHNICAL BRIEF
Read Access Time Write Access Time
50 ns
15 ns
LGE Internal Use Only
50 ns
15 ns