Principle of USB dual-machine communication
Since the USB model is a Host-Slave (host-peripheral) master-slave structure, there is no way to make two hosts communicate directly through the USB bus without going through the peripherals. However, the two hosts can communicate using their USB ports by adding a peripheral controller. Each peripheral controller is connected to a different host and uses a shared buffer to exchange data.
Cypress's EZ-Link and Prolific's PL-2301 integrate two peripheral controllers and a shared buffer into a chip as a bridge for two hosts to communicate through the USB bus. Other companies also provide similar control chips. In teaching robots, PL-2301 is used. PL-2301 is a full-speed USB control chip produced by Taiwan Prolific.
Control unit. Under the coordination of handshake signals, they exchange data without blocking through two FIFO buffers. PL-2301 PL-2301 includes two sets of independent USB containing four terminals: the default control terminal (address 00H), the interrupt terminal (address 81H), the block output terminal (address 02H), and the block input terminal (address 83H). Control transmission is used to complete the configuration of PL-2301 during the host enumeration phase and to control the handshake signal of PL-2301 when two hosts communicate. PL-2301 is a full-speed USB control chip produced by Taiwan Prolific Company. The structural block diagram of PL-2301 is shown in Figure 1. (5) TX_REQ block transmission request signal. (6) TX_C block transmission completion indication signal. (7) PEER_E tells the other party that this Under the coordination of these handshake signals, the upper computer and the lower computer can communicate bidirectionally.
Figure 2 is a flow chart of data transmission from host PC A to PC B. These underlying details do not need to be controlled and are completed by the PL-2301 driver.
Keywords：USB
Reference address：The principle of USB dual-machine communication
Since the USB model is a Host-Slave (host-peripheral) master-slave structure, there is no way to make two hosts communicate directly through the USB bus without going through the peripherals. However, the two hosts can communicate using their USB ports by adding a peripheral controller. Each peripheral controller is connected to a different host and uses a shared buffer to exchange data.
Cypress's EZ-Link and Prolific's PL-2301 integrate two peripheral controllers and a shared buffer into a chip as a bridge for two hosts to communicate through the USB bus. Other companies also provide similar control chips. In teaching robots, PL-2301 is used. PL-2301 is a full-speed USB control chip produced by Taiwan Prolific.
Control unit. Under the coordination of handshake signals, they exchange data without blocking through two FIFO buffers. PL-2301 PL-2301 includes two sets of independent USB containing four terminals: the default control terminal (address 00H), the interrupt terminal (address 81H), the block output terminal (address 02H), and the block input terminal (address 83H). Control transmission is used to complete the configuration of PL-2301 during the host enumeration phase and to control the handshake signal of PL-2301 when two hosts communicate. PL-2301 is a full-speed USB control chip produced by Taiwan Prolific Company. The structural block diagram of PL-2301 is shown in Figure 1. (5) TX_REQ block transmission request signal. (6) TX_C block transmission completion indication signal. (7) PEER_E tells the other party that this Under the coordination of these handshake signals, the upper computer and the lower computer can communicate bidirectionally.
Figure 2 is a flow chart of data transmission from host PC A to PC B. These underlying details do not need to be controlled and are completed by the PL-2301 driver.
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