초록 ▼

A method for transferring data on a communication medium between a host computer and a plurality of peripheral devices coupled to the medium at a plurality of first address locations, including first and second peripheral devices at a one of the first address locations. The host computer transmits a

A method for transferring data on a communication medium between a host computer and a plurality of peripheral devices coupled to the medium at a plurality of first address locations, including first and second peripheral devices at a one of the first address locations. The host computer transmits a plurality of first signals to the one of the first address locations requesting any peripheral devices at the one of the first address locations to transmit data to the host computer. The first peripheral device senses the medium to determine if the medium is currently in use. The second peripheral device senses the medium to determine if the medium is currently in use. The first peripheral device transmit data to the host computer when the medium is not in use. The second peripheral device discontinues the transmission of data when the medium is in use and sets an internal collision flag. The host computer transmits a plurality of second signals, including a second address, to the one of the first address locations, the second address becoming an address for the first peripheral device, and the second address not becoming an address for the second peripheral device, given that the internal collision flag for the second peripheral device is set.

대표청구항 ▼

A method for transferring signals and data, wherein the signals and data are transferred under the control of a host computer between the host computer and first and second peripheral devices, wherein the signals and data are transferred over a bus coupling the first and second peripheral devices to

A method for transferring signals and data, wherein the signals and data are transferred under the control of a host computer between the host computer and first and second peripheral devices, wherein the signals and data are transferred over a bus coupling the first and second peripheral devices to the host computer, wherein the bus is normally in a logical first state, and wherein the first and second peripheral devices each initially contain an identical first number as a command address for both the first and second peripheral devices, comprising the steps of: the host computer transmitting a plurality of first signals over the bus, wherein the plurality of first signals include a first talk command requesting any peripheral device with the first number as its command address to (1) transmit data to the host computer and (2) reset a collision detect bit of that peripheral device to a logical second state; given that the first number is the command address of the first peripheral device, the first peripheral device responding to the first talk command by attempting to transmit data over the bus to the host computer and, at the same time, the first peripheral device looking for a collision that indicates that the bus is currently in use, wherein a collision is detected if the first peripheral device attempts to transmit data in the logical first state on the bus but the bus is in or goes to the logical second state; given that the first number is the command address of the second peripheral device, the second peripheral device responding to the first talk command by attempting to transmit data over the bus to the host computer and, at the same time, the second peripheral device looking for a collision that indicates that the bus is currently in use, wherein a collision is detected if the second peripheral device attempts to transmit data in the logical first state on the bus but the bus is in or goes to the logical second state; the first peripheral device not detecting a collision, and the first peripheral device transmitting its data to the host computer over the bus; the second peripheral device detecting a collision and, as a result, (1) the second peripheral device setting the collision detect bit to the logical first state from the logical second state and (2) stopping the transmitting of data to the host computer from the second peripheral device over the bus; the host computer transmitting a plurality of second signals over the bus, wherein the plurality of second signals include a first listen command requesting any peripheral device with the first number as its command address to accept data sent by the host computer; the host computer sending a second number stored at a first soft address location as data over the bus; given that the first number is the command address of the first peripheral device, the first peripheral device responding to the first listen command by storing the second number as the command address of the first peripheral device; the second peripheral device not accepting the second number from the bus because the collision detect bit of the second peripheral device is set to the logical first state; the host computer transmitting a plurality of third signals over the bus, wherein the plurality of third signals include a second talk command requesting any peripheral device with the first number as its command address to (1) transmit data to the host computer and (2) reset the collision detect bit of that peripheral device to the logical second state; the first peripheral device not responding to the second talk command, given that the first number is no longer the command address of the first peripheral device; given that the first number is the command address of the second peripheral device, the second peripheral device responding to the second talk command by attempting to transmit data over the bus to the host computer and, at the same time, the second peripheral device looking for a collision that indicates that the bus is currently in use, wherein a collision is detected if the second peripheral device attempts to transmit data in the logical first state on the bus but the bus is in or goes to the logical second state; the second peripheral device not detecting a collision, and the second peripheral device transmitting its data to the host computer over the bus; the host computer transmitting a plurality of fourth signals over the bus; wherein the plurality of fourth signals include a second listen command requesting any peripheral device with the first number as its command address to accept data sent by the host computer; the host computer sending a third number stored at a second soft address location as data over the bus; the first peripheral device not responding to the second listen command, given that the first number is not longer the command address of the first peripheral device; given that the first number is the command address of the second peripheral device, the second peripheral device responding to the second listen command by storing the third number as the command address of the second peripheral device.