Design of a Parallel Processor for Visual Feedback Control Based on the Reconfiguration of Word Length

Abstract

In the sensor feedback control of intelligent robots, the delay time must be reduced for a large number of multioperand multiply-additions. To reduce the delay time for the multiply-additions, switch circuit is used to change the direct connection between the multipliers and adders, so that the overhead in data transfer is reduced. To change the word-length of the multi-operand multiply-adders, in addition, the switches are also provided in multipliers and adders. By changing to the short wordlength, the numbers of multiplier and adders can be increased. The performance evaluation shows that the delay time for visual feedback control becomes about 6 times faster than that of a parallel processor approach using conventional digital signal processor (DSPs).

Multimedia data processing using a VLIW hardware stack processor

“…In so doing, integer addition and logical operations are 32-bit unsigned operations and integer multiplication is a 16-bit signed operation. With multimedia data processing, many 8-bit and 16-bit operations are included; therefore, variable word length ALUs that support 8-bit K 4, 16-bit K 2, and 32-bit K 1 operations are used [11]. For stack optimization, with push/pop bit is introduced to explicitly control stack operation.…”

Real-time multimedia data processing using VLIW hardware stack processor

“…The MOOP supports the multimedia extension which makes possible the variable word-length operations [9]. The addition and subtraction supports one double-word (32-bitx 1).…”