Synchronous serial interface device with expandable frame width

Abstract

The invention discloses a synchronous serial interface device with expandable frame width, which comprises a register group unit, a processor bus interface unit , a transmitting and receiving control unit, a transmitting buffer unit, a receiving buffer unit and a receiving buffer unit, wherein the register group unit is connected with the processor bus interface unit; the processor bus interface unit is connected with a peripheral processor bus; the transmitting buffer unit is respectively connected with the register group unit and the transmitting and receiving control unit; the receiving buffer unit is respectively connected with the register group unit and the transmitting and receiving control unit; the transmitting and receiving control unit comprises a transmitting and receiving configuration circuit and an extended frame protocol circuit; the transmitting and receiving configuration circuit is used for configuring the extended frame protocol circuit; and the extended frame protocol circuit self-defines the format of an extended frame and is used for realizing the largest frame width to n bits, and n is a natural number larger than 16. The invention can provide the adjustable characteristic of larger width range of frame format to enable a SOC chip to be connected with more peripheral chips, thereby realizing a whole product with lower cost and better quality.

Description

technical field [0001] The invention belongs to the field of synchronous serial interface devices, in particular to a synchronous serial interface device widely used in video processing chips (SOC) and consumer chips, equipped with a general-purpose CPU interface or an AMBA APB bus interface, and with an expandable frame width . Background technique [0002] With the explosive development of SOC technology and consumer electronic equipment, more and more chips are designed with synchronous serial interface, the purpose is to provide a connection method with low speed, low cost and few pins to realize multiple chips or Interconnection of devices. For example, SOC uses synchronous serial interface to configure peripheral EEPROM chip or IF chip, and portable audio equipment uses synchronous serial interface to transmit audio data, etc. At present, these applications mainly use the following synchronous serial transmission protocols, including Motorola's SPI, TI's SSI, and Nat...

AI Technical Summary

Problems solved by technology

Devices designed according to these standards cannot meet a wider range of frame format settings and cannot meet new design requirements, resulting in defects in previous designs

like figure 1 As shown, it is a schematic diagram of an existing synchronous serial interface device, including a processor bus interface unit, a register set unit, a sending buffer unit, a receiving buffer unit, and a sending and receiving control unit. Since its frame format satisfies at most 4 to 4 16-bit wide range, so wider range of frame format settings cannot be accommodated

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