LG U890, Руководство по обслуживанию

Страница: 39 / 192

3.9 External memory interface
A.MSM6250A
The MSM6250A have two external memory interfaces with arbitration for the multi-layer AHB system
and memory controllers. The EBI1 bus is a high performance bus that supports a wide variety of
memories. EBI2 bus is targeted to be the interface for slow peripheral devices(i,.e., LCD) as well as
the NAND flash memory.
• 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 wide NAND flash.
- Support for parallel LCD interfaces, port mapped of memory mapped(16 & 8 bit)
• 1GMb NAND flash 512Mb SDRAM
• 2-CS(Chip Select) are used
3. TECHNICAL BRIEF
- 40 -
Interface Spec
Device Part Name Maker Read Access Time Write Access Time
FLASH TY9000A800E0GG Toshiba 35 ns/Bytes 50 ns/Bytes
SDRAM TY9000A800E0GG Toshiba 107 ns/4Double Word 53 ns/4Double Word
Table External memory interface for U890