IrDA modulation/demodulation integrated circuit device

• US 6,504,635 B1
• Filed: 12/10/1999
• Issued: 01/07/2003
• Est. Priority Date: 03/28/1997
• Status: Expired due to Fees

• Current Assignee: ROHM Co., Ltd.
• Original Assignee: ROHM Co., Ltd.
• Inventors: Nakashima, Takayuki
• Primary Examiner(s): NEGASH, KINFE MICHAEL
• Application Number:
  US09/381,636
• Time in Patent Office: 1,124 Days
• Field of Search: 359/152, 359/154, 359/163, 359/172, 385/14
• US Class Current: 398/25
• CPC Class Codes: H04L 1/0057 Block codes H04L1/0061, H04L1/0064 take precedence
• CPC Class Codes: H04L 1/0061 Error detection codes

Abstract

An IrDA modulation/demodulation integrated circuit device modulates and demodulates a signal by an IrDA-complying method that meets the SIR standards. The IrDA modulation/demodulation integrated circuit device has a CRC block for performing calculation on data consisting of A, C, and I fields to calculate an FCS and appending an FCS field to the data, a data transparency control block for performing data transparency control for transmission on the data output therefrom, and a flag block for adding a BOF flag and an EOF flag at the head and the tail, respectively, of the data obtained therethrough. The IrDA modulation/demodulation integrated circuit device also has a flag block for removing the BOF and EOF flags from a demodulated signal, a data transparency control block for performing data transparency control on the basis of the data output therefrom, and a CRC block for checking for a transfer error by checking the value in the FCS field.

Claims

1. An IrDA modulation/demodulation integrated circuit device for modulating/demodulating a signal by an IrDA-complying method that meets SIR standards, comprising:

a transmission-side CRC block for performing calculation on data consisting of an address field, a control field, and an information field to calculate a frame check sequence and then appending a frame check sequence field to the data;

a transmission-side data transparency control block for performing data transparency control for transmission on data output from the transmission-side CRC block;

a transmission-side flag block for adding a BOF flag and an EOF flag at a head and a tail, respectively, of data output from the transmission-side data transparency control block;

a reception-side flag block for removing the BOF flag and the EOF flag from a demodulated signal;

a reception-side data transparency control block for performing data transparency control for reception on a basis of data output from the reception-side flag block; and

a reception-side CRC block for checking for a transfer error by checking a value in the frame check sequence field included in data output from the reception-side data transparency control block.

2. An IrDA modulation/demodulation integrated circuit device as claimed in claim 1, further comprising:

a register for storing a signal for specifying a number of BOF flags added at a head of a frame,

wherein, in accordance with the signal from the register, the transmission-side flag block adds more than one BOF flag to the frame.

3. An IrDA modulation integrated circuit device for modulating a signal by an IrDA-complying method that meets SIR standards, comprising:

a transmission-side CRC block for performing calculation on data consisting of an address field, a control field, and an information field to calculate a frame check sequence and then appending a frame check sequence field to the data;

a transmission-side data transparency control block for performing data transparency control for transmission on data output from the transmission-side CRC block; and

a transmission-side flag block for adding a BOF flag and an EOF flag at a head and a tail, respectively, of data output from the transmission-side data transparency control block.

4. An IrDA demodulation integrated circuit device for demodulating a signal by an IrDA-complying method that meets SIR standards, comprising:

a reception-side flag block for removing a BOF flag and an EOF flag from a demodulated signal;

a reception-side data transparency control block for performing data transparency control for reception on a basis of data output from the reception-side flag block; and

a reception-side CRC block for checking for a transfer error by checking a value in a frame check sequence field included in data output from the reception-side data transparency control block.