PRODUCT INFORMATION Integrated Circuits Group APPLICATIONS: PDA DVD MD Notebook PC Cellular Phone Digital Camera (R) ARM7TDMI DESCRIPTION The ARM7TDMI is a member of the Advanced RISC Machines (ARM) family of general purpose 32-bit microprocessers, which offer high performance for very low power consumption and price. The ARM architecture is based on Reduced Instruction Set Computer (RISC) principles, and the instruction set and related decode mechanism are much simpler than those of microprogrammed Complex Instruction Set Computers. This simplicity results in a high instruction throughput and impressive real-time interrupt response from a small and cost-effective chip. Pipelining is employed so that all parts of the processing and memory systems can operate continuously. Typically, while one instruction is being executed, its successor is being decoded, and a third instruction is being fetched from memory. The ARM memory interface has been designed to allow the performance potential to be realized without incurring high costs in the memory system. Speed-critical control signals are pipelined to allow system control functions to be implemented in standard lowpower logic, and these control signals facilitate the exploitation of the fast local access modes offered by industry standard dynamic RAMs. ARM7TDMI BLOCK DIAGRAM Scan Chain 0 Scan Chain 2 RANGEOUT0 RANGEOUT1 ICE BREAKER EXTERN1 EXTERN0 OPC RW MAS [1:0] TRANS MREQ A [31:0] CORE ALL OTHER SIGNALS D [31:0] DIN [31:0] DOUT [31:0] BUS SPLITTER Scan Chain 1 TAP CONTROLLER TCK TMS TRST TDI TDO TAPS [3:0] IR [3:0] SCREG [3:0] ARM7T-1 The information for this document is from the data sheet ARM DDI 0029E; Issue Date: August 1995. Copyright (c)1998, Sharp Electronics Corp. All rights reserved. All tradenames are the registered property of their respective owners. Specifications are subject to change without notice. SMT98042