Communication system and method on basis of double-speed synchronous dynamic random access memory interface

Abstract

The invention relates to a mobile terminal and discloses a communication system and method on the basis of a double-speed synchronous dynamic random access memory interface. A master controller of the communication system is communicated with a slave controller through the simple double-speed synchronous dynamic random access memory interface. The double-speed synchronous dynamic random access memory interface comprises six signal lines, chip-selection signals (CS#), positive time clock signals (CK), negative clock signals (CK#), read-write selection signals (WE#) are output signals in the master controller and input signals in the slave controller, digital signals (DQ) and data strobe pulse signals (DQS) are input and output signals, the DQS and the CK are same in frequency, and the upper and lower edges of the DQS are used for data transmission. High-speed data transmission can be realized by only six signals lines, the master controller and the slave controller are respectively used for a baseband communication processor and an application processor, and the problems that a conventional UART (universal asynchronous receiver / transmitter) interface is low in transmission speed and USB (universal serial bus) software development and transplant are too complicated are solved.

Description

technical field [0001] The present invention relates to a mobile terminal, in particular to a communication system and method for realizing a simplified double-rate synchronous dynamic random access (SDDR) interface for high-speed data transmission between an application processor (AP) and a baseband communication processor (CP). Background technique [0002] With the rapid development of mobile communication technology, from the previous 2G to the current 3G, especially the 4G LTE broadband wireless communication technology that will be commercialized in the near future, the uplink and downlink transmission rate of wireless data has been rapidly increased, and the downlink transmission speed requirement has changed from the original The level of several Mbps to hundreds of Mbps, and the uplink transmission speed has also reached the level of several Mbps to tens of Mbps. In the 2G era, the traditional communication technology that uses the standard RS232 asynchronous serial...

AI Technical Summary

Problems solved by technology

[0003] Although USB interface technology has been widely used on PCs, for mobile terminals, due to the complexity of software transplantation and the huge workload of software development, it often makes an AP and CP data transmission communication due to software problems. Slow or even delayed, the software complexity of USB technology has caused a huge obstacle for it as a communication interface between high-speed CP and AP; in addition, although the theoretical bandwidth of USB2.0 high speed is as high as 480Mbps, due to protocol overhead and system software design Influence, usually its actual effective bandwidth is difficult to exceed 200Mbps

[0004] Due to the basic principle of asynchronous transmission and asynchronous sampling of UART interface technology, in order to ensure the stability of UART data transmission, its internal sampling rate is generally required to reach about 16 times the baud rate that the interface can support. Generally, the highest rate can only be about 100M ~ 200M, which leads to the ideal UART interface rate can only achieve a baud rate of about 10Mbps

The rate of UART is basically sufficient for the existing 3G technology, but in the 4G LTE era, when the communication rate between the CP and the AP is required to reach hundreds of Mbps and tens of Mbps concurrently in the downlink, this transmission technology will be powerless

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