A dual-port peripheral configuration interface circuit

Abstract

The invention belongs to the field of embedded systems, and discloses a dual-port peripheral configuration interface circuit. According to the interface circuit, only two IO interfaces are provided externally, one is an RCK (read clock) input port, and the other is an RDA (remote data access) data two-way port. A read-write data port, a read / write address signal port, and a read-write enable signal port are connected with a register set. The interface circuit comprises a clock counter, a read-write judging register, an address / data shifting register, a read data shifting register, an address register, a write enable signal generation register and a read enable signal generation register. The interface circuit disclosed by the invention has the advantages that the communication protocol and the circuit are simple, external ports are few, the communication speed changes with the rate change of an externally supplied RCK clock, an externally supplied system clock is not needed, and the like.

Description

technical field [0001] The invention belongs to the field of embedded systems and relates to an all-digital logic dual-port peripheral configuration interface circuit. Background technique [0002] There are many commonly used peripheral configuration interface circuits, but in the application of a single master to a single slave, it is often cumbersome. For example, the commonly used SPI (SerialPeripheralInterface) interface requires 4 ports such as CSN / SCK / MOSI / MISO. MOSI / MISO will not work at the same time, resulting in a waste of resources; and the commonly used I2C (Inter-Integrated Circuit) interface, although there are only two ports used, SCL / SDA, but in terms of speed, it is only 100Kps / 400Kbps / 3.4Mbps These 3 kinds of agreements stipulate the good rate. And according to the agreement, the slave needs to respond ACK every time after the master sends data, which is unnecessary for single-master and single-slave systems, resulting in a waste of hardware resources; an...

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Problems solved by technology

[0002] There are many commonly used peripheral configuration interface circuits, but in the application of a single master to a single slave, it is often cumbersome. For example, the commonly used SPI (SerialPeripheralInterface) interface requires 4 ports such as CSN / SCK / MOSI / MISO. MOSI / MISO will not work at the same time, resulting in a waste of resources; and the commonly used I2C (Inter-Integrated Circuit) interface, although there are only two ports used, SCL / SDA, but in terms of speed, it is only 100Kps / 400Kbps / 3.4Mbps The rates stipulated by these three protocols

And according to the agreement, the slave needs to respond ACK every time after the master sends data, which is unnecessary for single-master and single-slave systems, resulting in a waste of hardware resources; and another commonly used UART (UniversalAsynchronousReceiver / Transmitter) interface, although there are only two TxD / RxD ports, but the two parties need to negotiate the rate first, and both parties need to have their own system clock to complete the normal communication process

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