发明名称 |
COMMUNICATION SUBSYSTEM WITH AN AUTOMATIC ABORT TRANSMISSION UPON TRANSMIT UNDERRUN |
摘要 |
A communication device comprises a microprocessor which feeds bytes to a universal synchronous receiver transmitter (USRT) 88. The USRT transmits the data serially, signal C2TXSO+. On an underrun (USRT empty before next byte in), the USRT transmits a sequence of flag bytes (01111110) and generates an underrun signal C2TXTXU+. This signal is fed to transmit underrun logic 92, where a shift register 350 generates a 1 signal which lasts long enough to convert the first two 0's in the flag byte sequence to 1's by OR gate 354. A sequence of 8 to 13 1's is therefore generated prior to the flag bytes, this 1 sequence indicating an underrun condition. |
申请公布号 |
PH18943(A) |
申请公布日期 |
1985.11.14 |
申请号 |
PH20010000263 |
申请日期 |
1981.10.02 |
申请人 |
HONEYWELL INFORMATION SYSTEM INC. |
发明人 |
THOMAS O.HOLTEY;STEVEN S.NOYES;JAMES C.RAYMOND;RICHARD P.KELLY |
分类号 |
H04M11/06;G06F13/00;G06F13/42;H04L1/00;H04L1/22;H04L29/02;H04M11/00 |
主分类号 |
H04M11/06 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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