发明名称 Microcomputer with accumulator saturation upon overflow
摘要 A system for real-time digital signal processing employs a single-chip microcomputer device having separate on-chip program ROM and data RAM, with separate address and data paths for program and data; however, the accumulator in the data path may be used as a program address source for table look-up, for example. An external program address bus allows off-chip program fetch in an expansion mode, with the opcode returned by an external data bus. A bus interchange module allows transfer between the separate internal program and data busses in special circumstances, such as accumulator addressing. The internal busses are 16-bit, while the ALU and accumulator are 32-bit. A multiplier circuit produces a single state 16x16 multiply function separate from the ALU, with 32-bit output to the ALU. One input to the ALU passes through a 0-to-15 bit shifter with sign extension. The contents of the accumulator may be forced to a maximum or minimum value upon overflow or underflow to simulate saturation in analog systems; this function may be enabled or disabled under instruction control.
申请公布号 US4519031(A) 申请公布日期 1985.05.21
申请号 US19820350953 申请日期 1982.02.22
申请人 TEXAS INSTRUMENTS INCORPORATED 发明人 MAGAR, SURENDAR;GASS, WANDA K.
分类号 G06F7/50;G06F7/509;G06F9/302;(IPC1-7):G06F9/00;G06F13/00 主分类号 G06F7/50
代理机构 代理人
主权项
地址