LG TracFone LG840G Service Manual page 32

3. TECHNICAL BRIEF
3.5.2 Memory support (and LCD interface)
The QSC62x0 device has two external bus interface (EBI) ports: EBI1 and EBI2.
EBI1 supports high-speed synchronous dynamic devices. Its memory controller supports the new mobile
DDR SDRAM memories with its higher bandwidth and ability to run at high clock frequencies. This interface supports
the high-bandwidth, high-density, and low-latency requirements of the QSC's advanced on-chip capabilities such as the
ARM9 processor, highperformance graphics, and video applications.
EBI2 is the slower speed interface intended to support memory devices such as NAND flash and asynchronous SRAM,
peripheral devices such as LCDs, and the UBM receiver for multicast or broadcast reception (QSC6270 only). In addition,
EBI2 is required to support a synchronous-burst AAD NOR flash to enable a NOR/DDR SDRAM memory configuration
because the simultaneous mode (NOR, SDRAM) is not supported on the EBI1 bus.
The ARM926EJ-S microprocessor is a cached processor and all its accesses to external memory use burst techniques of
four or eight 32-bit words when the memory region is declared to be cacheable/bufferable.
To take advantage of this QSC higher performance feature, data from memories must satisfy the requirements for these
burst accesses.
The ARM926EJ-S microprocessor is a cached processor and all its accesses to external memory use burst techniques of
four or eight 32-bit words when the memory region is declared to be cacheable/bufferable.
To take advantage of this QSC higher performance feature, data from memories must satisfy the requirements for these
burst accesses.
The ARM926EJ-S microprocessor is a cached processor and all its accesses to external memory use burst techniques of
four or eight 32-bit words when the memory region is declared to be cacheable/bufferable.
To take advantage of this QSC higher performance feature, data from memories must satisfy the requirements for these
burst accesses.
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Only for training and service purposes