LS1022A datasheet(34/71 Pages) FREESCALE

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Architecture

TWR-LS1021A Reference Manual, Rev. 0

Freescale Semiconductor

2-19

— Raster (framebuffer) width, height and depth

— An “Area Of Interest”, often just equal to the display width and height.

•

Pixel clock within limits of monitor

•

Horizontal and vertical sync parameters, which include:

— Polarity (generally positive, but not always)

— Front/back “porch” - the interval between sync transitions and active pixel data; usually one or

two pixel clocks (HSYNC) or one or two lines (VSYNC) is sufficient.

— Sync assertion time - display width (in pixels) + front and back porch (in pixels), plus the sync

assertion time, should be approximately equal to the monitor stated horizontal timing

parameter (which might be in units of microseconds, pixels or Hz). A similar process is used

for vertical timing.

The DCU block are configured as described in Table 2-13.

2.14

I2C

The LS1021A / LS1020A devices support up to four I2C buses.

Figure 2-14 shows the I2C subsystem connection. The devices available on each I2C bus segment are

listed in Table 2-14.

Table 2-13. DIU configuration

Configuration signal

Controls

Value

Description

cfg_mux_qetdm_diu0 SW: SW3[6]

REG:0x0C

QE TDM signals are routed to the DCU block.

QE TDM signals are routed to the UCC block.

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