ml87v3116 Oki Semiconductor, ml87v3116 Datasheet - Page 25

• Manufacturer Part Number: ml87v3116
• Description: Display Controller With Built-in Display Memory And Jpeg
• Manufacturer: Oki Semiconductor

2.5 Data Buffer and Controller
2.5.1 General Description
OKI Semiconductor
A data buffer is a memory buffer having two-dimensional addresses. The memory size is 1 Mbyte and the
depth is 1 pixel (16 bits).
Write/read access to the Data Buffer is always performed via block access.
External SDRAM is called an extension Data Buffer, which is assumed as an address extension area of the
internal Data Buffer. However, there are restrictions on access to extension Data Buffers.
If the internal data buffer is used two-dimensionally, the X size (horizontal direction) and Y size (vertical
direction) of the memory size can be changed.
The following types of sources are available for access to data buffers:
For access to the internal Data Buffer, up to four access sources can simultaneously (time sharing) be used
among the access sources listed above. However, JPEG accesses of c) and d) are always carried out
simultaneously in pair. Also, during the operations of the copy functions e) and f), the host access g) cannot be
carried out simultaneously.
For access to an extension data buffer, always only one access source can be used.
• Data buffer size variations (X size × Y size)
4096 × 128 pixels
2048 × 256 pixels
1024 × 512 pixels
512 × 1024 pixels
a) Video input write
b) Display output read
c) JPEG block access read/write
d) JPEG compressed data file read/write
e) Copy source read
f) Copy destination write
g) Host access read/write
h) Refresh
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