ASX340AT datasheet(29/54 Pages) ONSEMI

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ASX340AT

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Sequential WRITE, Start at Random Location

This sequence (Figure 22) starts in the same way as the

single WRITE to random location (Figure 21). Instead of

generating a no-acknowledge bit after the first byte of data

has been transferred, the master generates an acknowledge

bit and continues to perform byte writes until “L” bytes have

been written. The WRITE is terminated by the master

generating a stop condition.

Figure 27. Single WRITE to Random Location

Slave Address

Reg Address[15:8]

Reg Address[7:0]

Write Data

Previous Reg Address, N

Reg Address, M

M+1

M+2

M+1

M+3

Write Data

M+L−2

M+L−1

M+L

Write Data

(15:8)

Write Data

(7:0)

Write Data

(15:8)

Write Data

(7:0)

Write Data

(15:8)

Write Data

(7:0)

Write Data

(15:8)

Write Data

(7:0)

OVERLAY CAPABILITY

Figure 23 highlights the graphical overlay data flow of

theASX340AT. The images are separated to fit into 2 KB

blocks of memory after compression.

• Up to four overlays may be blended simultaneously

• Overlay size 360 x 480 pixels rendered into a display

area of 720 x 480 pixels (NTSC) or 720 x 576 (PAL)

• Selectable readout: rotating order is user programmable

• Dynamic movement through predefined overlay images

• Palette of 32 colors out of 64,000 with eight colors per

bitmap

• Blend factors may be changed dynamically to achieve

smooth transitions

The host commands allow a bitmap to be written

piecemeal to a memory buffer through the two-wire serial

interface, and also through DMA direct from SPI Flash

memory. Multiple encoding passes may be required to fit an

image into a 2 KB block of memory; alternatively, the image

can be divided into two or more blocks to make the image

fit. Every graphic image may be positioned in the horizontal

and vertical direction and overlap with other graphic

images.

The host may load an image at any time. Under control of

DMA assist, data are transferred to the off-screen buffer in

compressed form. This assures that no display data are

corrupted during the replenishment of the four active

overlay buffers.

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