Data receiving device, data transmitting apparatus, data transmitting method, and image forming apparatus

The data receiving device comprising:

• a receiving unit for receiving image data and synchronous data that have been alternately transmitted from a sending end;
• a receiving clock generator for generating a receiving clock signal for latching data to be received;
• a PLL, circuit for synchronizing phases of the generated receiving clock signal and the synchronous data;
• and
• a controller for stopping the PLL circuit synchronizing the phases while the receiving unit is receiving the image data;
• wherein the controller includes an identification unit for identifying received data as one of the synchronous data and the image data, and
• wherein the identification unit identifies the received data as one of the synchronous data and the image data according to a number of bits of data that have been received after detection of a reference signal.

The data receiving device comprising:

• a receiving unit for receiving image data and synchronous data that have been alternately transmitted from a sending end;
• a receiving clock generator for generating a receiving clock signal for latching data to be received;
• a PLL circuit for synchronizing phases of the generated receiving clock signal and the synchronous data;
• and
• a controller for stopping the PLL circuit synchronizing the phases while the receiving unit is receiving the image data;
• wherein the receiving unit repeatedly receives a predetermined number of bits of synchronous data and image data that is one scanning line of pixel data as one frame.

An image forming apparatus, comprising:

• a data receiving device that includes,
• a receiving unit for receiving image data and synchronous data that have been alternately transmitted from a sending end,
• a receiving clock generator for generating a receiving clock signal for latching data to be received,
• a PLL circuit for synchronizing phases of the generated receiving clock signal and the synchronous data, and
• a controller for stopping the PLL circuit synchronizing the phases while the receiving unit is receiving the image data;
• and
• an image forming unit for forming images according to the received image data.

The image forming apparatus comprising:

• a data receiving device that includes,
• a receiving unit for receiving image data and synchronous data that have been alternately transmitted from a sending end,
• a receiving clock generator for generating a receiving clock signal for latching data to be received,
• a PLL circuit for synchronizing phases of the generated receiving clock signal and the synchronous data, and
• a controller for stopping the PLL circuit synchronizing the phases while the receiving unit is receiving the image data;
• and
• an image forming unit for forming images according to the received image data,
• wherein the image forming unit includes a scanning unit for line scanning an image holding element according to the received image data, and
• the controller controls the PLL circuit so that the PLL circuit synchronizes the phases from detection of a horizontal synchronous signal, which indicates start of scanning of one scanning line, until start of writing on the image holding element.

The image forming apparatus comprising:

• a data receiving device that includes,
• a receiving unit for receiving image data and synchronous data that have been alternately transmitted from a sending end,
• a receiving clock generator for generating a receiving clock signal for latching data to be received,
• a PLL circuit for synchronizing phases of the generated receiving clock signal and the synchronous data, and
• a controller for stopping the PLL circuit synchronizing the phases while the receiving unit is receiving the image data;
• and
• an image forming unit for forming images according to the received image data,
• wherein the image forming unit includes a scanning unit for line scanning an image holding element according to the received image data, and
• the controller identifies received data as one of the synchronous data and the image data according to the number of bits of data that have been received after detection of a horizontal synchronous signal, which indicates start of scanning of one scanning line.

A data transmitting apparatus, comprising:

• a data sending device that includes a sending unit for sending a plurality of frames of serial data which each include synchronous data and effective data;
• and
• a data receiving device that includes
• (1) a receiving unit for receiving the serial data,
• (2) a receiving clock generator for generating a receiving clock signal,
• (3) a frequency divider for dividing frequency of the receiving clock signal and generating a divided clock signal,
• (4) a PLL circuit for synchronizing phases of the generated divided clock signal and the received synchronous data, and
• (5) a controller for stopping the PLL circuit synchronizing the phases while the effective data is being received.

The data transmitting apparatus comprising:

• a data sending device that includes a sending unit for sending a plurality of frames of serial data which each include synchronous data and effective data;
• and
• a data receiving device that includes:
• (1) a receiving unit for receiving the serial data,
• (2) a receiving clock generator for generating a receiving clock signal,
• (3) a frequency divider for dividing frequency of the receiving clock signal and generating a divided clock signal,
• (4) a PLL circuit for synchronizing phases of the generated divided clock signal and the received synchronous data, and
• (5) a controller for stopping the PLL circuit synchronizing the phases while the effective data is being received,
• wherein the data sending device further includes:
• a sending clock generator for generating a sending clock signal;
• a synchronous data generator for dividing frequency of the sending clock signal and generating the synchronous data;
• and
• a selector for determining whether the synchronous data or the effective data is to be sent.

An image forming apparatus, comprising:

• a data transmitting apparatus that includes,
• a data sending device having a sending unit for sending a plurality of frames of serial data which each include synchronous data and image data, and
• a data receiving device having
• (1) a receiving unit for receiving the serial data,
• (2) a receiving clock generator for generating a receiving clock signal,
• (3) a frequency divider for dividing frequency of the receiving clock signal and generating a divided clock signal,
• (4) a PLL circuit for synchronizing phases of the generated divided clock signal and the received synchronous data, and
• (5) a controller for stopping the PLL circuit synchronizing the phases while the image data is being received;
• and an image forming unit for forming images according to the image data that the data receiving device has received.