STK6005 Просмотр технического описания (PDF) - Unspecified

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STK6005

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STK6005

Video

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Buffer Status Detection

STK6005 detects the operation of internal buffer and provides the information to correctly synchronize the input

and output image. The registers of buffer status are shown below:

1. OverRun: This flag is set to 1 when the input rate of input image is larger than the output rate. Some input

video data are overwritten before output.

2. UnderRun: This flag is set to 1 when the output rate of output image is larger than the input rate. Some

input video data are not available for output.

3. BufUsage: This 16-bit value indicates the maximum buffer usage. A bit 15 is also an indicator for underrun.

Bits 14 to 11 indicate the maximum line usage of internal buffer. Bits 10 to 0 indicate the pixel

usage of internal buffer.

4. PosVXDE: This 11-bit value indicates the vertical position (lines) of input image stored in the internal

buffer when STK6005 starts to output the first video data of a frame. This value should be

in range of 3 – 5 for a correct input-output synchronization.

5. PosHXDE: This 11-bit value indicates the horizontal position (pixels) of input image stored in internal

buffer when STK6005 starts to output the first video data of a frame.

5.15 I2C Interface

STK6005 supports the industrial 2-wire serial bus interface to communicate with external micro-controller.

The interface consists of an input pin SCL for serial clock and a bi-directional pin SDA for input / output

data. The slave address of this chip is 1111010x (F4H for write and F5H for read operations). The I2C

block will auto-increase the register address after each data write-in or read-out. For the operation timing

and protocol, please refer to the 2-wire serial bus specification.

5.16 Interrupt

STK6005 provides 8 interrupt flags to tell the micro-controller when the defined internal events happen.

The INTN pin will output low when any interrupt flag is being set. The interrupt flag register indicates

what events trigger the interrupt. To write data to the interrupt enable register (0x7F) will automatically

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