Patent
1996-08-29
1999-03-09
Shah, Kamini
39520044, G06F 1500, H04J 316
Patent
active
058812288
ABSTRACT:
A communication subsystem used in an aircraft entertainment system employs a microcontroller and a dual-ported RAM to relieve burden from the host processor in handling low-level operations in communicating with external devices. The host processor and the microcontroller accesses the dual-ported RAM by testing the semaphore to determine if the DPRAM is available. If available, the processor and/or the microcontroller will read/write the messages from/to the DPRAM as appropriate. The microcontroller controls the communication interface controllers directly and will send messages read from the DPRAM to the CICs or write to the DPRAM messages received from the CICs without host processor's intervention. The microcontroller also performs other low-level operations such as header/trailer processing and error checking/correcting free from the host processor.
REFERENCES:
patent: 5440746 (1995-08-01), Lentz
patent: 5532958 (1996-07-01), Jiang et al.
patent: 5568484 (1996-10-01), Margis
Atkinson Michael
Shah Dilip C.
Shen Kouwei
Whitehouse James
Shah Kamini
Sony Corporation
Sony Trans Com Inc.
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