LG U970, Service Manual

Page: 49 / 210

3.10. External memory interface
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. In addition, MSM6280 provide SD bus
interface. U970/KU970 supports 512MByte free user memory 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).
• 1Gb NAND(8bit) flash 512Mb SDRAM (32bit)
+ 512MB NAND flash memory( 4 bit SD interface )
• 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.
3. TECHNICAL BRIEF
- 50 -
Interface Spec
Device Part Name Maker Read Access Time Write Access Time
FLASH TY9C00A800AUGK Toshiba 50 ns 50 ns
SDRAM TY9C00A800AUGK Toshiba 15 ns 15 ns
Table#1. External memory interface