User Guide

Figure 127 System connector inputs and pads

User interface

Display

The display is mounted on the UI-flex.

The display unit has a parallel interface, consisting of the following:

• 8-bit data bus (DISPDATA(7:0))

• Write enable WRX

• Read enable RDX

The display interface block in Tiku handles the above signals, while the ones in the table below are handled by

other components on the PWB.

Table 17 Display signals handled by PWB components

Note: More information about the VLED signals can be found in LED and driver. (Page 8–15)

Signal Name Value

TE The tearing effect (TE) signal is generated by the LCD controller and is used as

an interrupt input to the interrupt controller built in Tiku. The signal is used

to synchronise the process of updating display data with the refreshing rate

of the LCD in a way to avoid tearing effect.

CSX The Chip Select signal is the input to the LCD controller. The signal is used in

the serial interface mode. The signal is tied to ground on the PWB, as the

parallel interface mode is selected permanently.

VLED1+ Positive power supply to backlight LEDs

VLED2+

VLED1- Common ground for the backlight LEDs on the PWB.

VLED2-

GND 3x Ground connection to the LCD components on the PWB

Engine interface

A 24-pin connector provides the interface between the display unit and the PWB (connected through the UI-

flex). Internally, the Tiku display interface has interfaces with the VIAbus and the secondary DMA controller.

RM-13/33

System Module Description Nokia Customer Care

9240218 (Issue 1) Company Confidential Page 8–13