phyCORE-AM3517 Hardware Manual

Part II, Chapter 25: LCD and DVI Connectivity L-761e_2

Table 25-5 shows a summary of the required switch settings for each of the AM3517 LCD operating

modes.

Table 25-5. LCD Mode Jumper Summary (S1-1,S1-2, S1-3, S1-4)

LCD Mode

24-bit 8:8:8

18-bit 6:6:6

16-bit 5:6:5

12-bit 4:4:4

Switch Settings (S1-1, S1-2, S1-3, S1-4)

OPEN, OPEN, OPEN, OPEN

CLOSED, CLOSED, CLOSED, OPEN

CLOSED, CLOSED, OPEN, CLOSED

CLOSED, CLOSED, OPEN, OPEN

25.1 DVI Connector

A DVI connector is provided at X8, see

Figure 25-1

. The DVI encoder (U28) formats the DSS video signals in 24 bit mode appropriately for any DVI (digital) compatible monitor. The DVI output operates in parallel with the LCD outputs so the DVI, LVDS LCD and TTL LCD ports can simultaneously drive video to their respective connectors.

A detailed list of the connector and applicable configuration jumpers is presented below

JP19 This jumper is used to allow the AM3517 to put the DVI encoder into a power down mode.

CLOSE this jumper to allow AM3517 control of the power down. OPEN this jumper to allow

GPIO_155 to be used as a GPIO.

JP13 This jumper is used to set the DVI encoder IO voltage levels to 1.8V or 3.3V. CLOSE this jumper to operate SOM IOs at1.8V; OPEN to use 3.3V IOs.

X8 DVI (digital) interface connector. This can be connected to a digital DVI compatible monitor; resolution must be consistent with SOM BSP configuration.

25.2 LVDS Connectors

Two connectors are provided to support LVDS LCDs. The LVDS signaling connector is provided at X12 and the power connector is at X20. The LVDS output operates in parallel with the DVI and TTL LCD outputs so the DVI and TTL LCD ports can simultaneously drive video to their respective connectors.

A detailed list of applicable configuration jumpers, switches, and connectors is presented below.

JP25 LCD backlight control jumper. By default this jumper is CLOSED, selecting processor signal

ETK_D14 to control LCD backlight. OPEN this jumper to permanently turn on the LCD backlight. When this jumper is removed, the processor signal ETK_D14 becomes free for external use.

S2

JP24

Reserved

LCD PWM control jumper. By default this jumper is CLOSED, selecting processor signal

GPMC_NCS2 to control LCD backlight PWM (brightness). OPEN this jumper to permanently disable LCD backlight control. When this jumper is removed, the processor signal

GPMC_NCS2 becomes free for external use.

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