CS1311 datasheet(17/25 Pages) NSC

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Signal Definitions (Continued)

2.2.5

Video Out Interface Signals

Signal Name

Ball

No.

Type

Description

VO_CLK

J19

I/O

Clock. The VO module emits VO_DATA[07:00] on a positive edge of

VO_CLK. VO_CLK can be configured as an input (reset default) or out-

put.

If configured as an input: VO_CLK is received from external display

clock master circuitry.

If configured as an output: The CS1301/CS1311 emits a programmable

clock frequency. The emitted frequency can be set between approxi-

mately 4 and 81 MHz with a sub-Hertz resolution. The clock generated is

frequency accurate and has low jitter properties due to a combination of

an on-chip DDS (Direct Digital Synthesizer) and VCO/PLL.

If used as an output, a board level 27 to 33

Ω series resistor is recom-

mended to reduce ringing.

VO_IO1

J18

I/O

Input/Output 1. This pin can function as HS (Horizontal Sync) output or

as STMSG (Start Message) output.

If set as HS output: VO_IO1 outputs the HS output signal.

In message passing mode, VO_IO1 acts as the STMSG output signal.

VO_IO2

H20

I/O

Input/Output 2. This pin can function as FS (Frame Sync) input, FS out-

put or as ENDMSG (End Message) output.

If set as FS input, it can be set to respond to positive or negative edge

transitions.

If the VO module operates in external sync mode and the selected tran-

sition occurs, the VO module sends two fields of video data. Note: this

works only once after a reset.

In message passing mode, this pin acts as ENDMSG output signal.

VO_DATA[07:00]

K20, K12,

M20,

M19,

M18, N20,

N19, P20

Data Bus. CCIR-656 style YUV 4:2:2 digital output data, or general pur-

pose high-speed data output channel. Output changes on positive edge

of VO_CLK.

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