G - Physics – 06 – F
Patent
G - Physics
06
F
G06F 15/167 (2006.01) G06F 13/40 (2006.01)
Patent
CA 2234635
A device for use when exchanging data between two processor units comprises a first processor unit (6;8), which is arranged to selectively operate in one of a synchronous mode and an asynchronous mode when exchanging data with a second processor unit (8;6) through a data memory area in a common memory (7). Preferably, the access to the data memory area is controlled by a state machine in the first processor unit. The state machine has a first state in which the data memory area is free, a second and a third state in which the data memory area is reserved for the first processor unit(6;8) and the second processor unit (8;6), respectively, and a fourth and a fifth state, in which the data memory area is accessed by the first processor unit (6;8) and the second processor unit (8;6), respectively. The device is advantageously used in a fieldbus system.
Dahlstrom Staffan
Hassbjer Nicolas
Johansson Jorgen
Kroop Andreas
Fetherstonhaugh & Co.
Hms Fieldbus Systems Ab
Hms Industrial Networks Ab
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