H - Electricity – 04 – L
Patent
H - Electricity
04
L
340/81
H04L 5/14 (2006.01) G06F 13/366 (2006.01) G06F 13/42 (2006.01)
Patent
CA 1243740
COMMUNICATIONS SYSTEM EMPLOYING CONTROL LINE MINIMIZATION ABSTRACT A communications system (100) employs a multiline bus (101) including control lines (103 and 104) for multiple functions in order to minimize the required number of bus lines. This technique is most applicable to small computer systems which are hand portable or briefcase portable and which operate with small peripherals. The transmitting device (106) places an active signal on a handshake line (103) for a predetermined period of time. The receiving device (107, 108 and 109) detects this active signal and also places an active signal on the handshake line. The transmitting device applies valid data to the data lines (102) throughout the period that a active signal is on the handshake line (103). Upon detection of the data the receiver releases the handshake line. Using this technique a single line (103) is used to indicate valid data transmission and proper reception. An additional bus available line (104), used by a master device (106) to alert slave devices (107, 108 and 109) that communications is in process, can be employed by at least some of the slave devices (107, 108 and 109) to request service from the master device (106).
443796
Ferrio Tom M.
Wilson Carey B.
Kirby Eades Gale Baker
Texas Instruments Incorporated
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