The printer was also valuable for program development because it could produce a hard copy of the calculator's program including the alphanumeric mnemonics instead of just the numeric codes normally visible on the display, as well as a dump of the data registers, a trace of the program's execution and other information about the program.
32.
On exit from the RESET state, the instruction register is preloaded with either BYPASS or IDCODE . This allows JTAG hosts to identify the size and, at least partially, contents of the scan chain to which they are connected . ( They can enter the RESET state then scan the Data Register until they read back the data they wrote.
33.
:: : ( me not expressing self well; instant interview FAIL ) In embedded systems it's quite common to have IO devices like modem chips, sound chips, network control chips wired to their own chip select and thus their control and data registers appear in the cpu's address space like magic bits of volatile memory.
34.
These registers include the " IR " ( instruction register ), " IBR " ( instruction buffer register ), " MQ " ( multiplier quotient register ), " MAR " ( memory address register ), and " MDR " ( memory data register ) . " The architecture also uses a program counter ( " PC " ) to keep track of where in the program the machine is.
35.
While some have called it a RISC due to its rather sparse nature ( and because that was a desirable marketing buzzword at the time ), it was heavily microcoded, had a limited register set, and complex memory-to-memory instructions, all of which place it firmly in the load-store RISC CPUs, the transputer had only three data registers, which behaved as a stack.
36.
The processor is MIPS-based modified instructions, the main VU0 core is a superscalar, in-order 2-issue design with 6 stage long integer pipelines and 15 stage long floating point pipeline, 32 entries 128 bit VLIW SIMD registers ( naming / renaming ), one 64 bit accumulator and two entries 64 bit general data register, 8 entries 16 bit fix function registers and 16 entries 8 bit controller registers, two 64 bit integer ALUs, 128bit Load-Store Unit ( LSU ), Branch Execution Unit ( BXU ) and a 32 bit VU1 FPU coprocessor ( acted as sync controller for VPU0 / VPU1 ) that contain a MIPS base processor core with 32 entries 64bit FP registers and 15 entries 32bit integer registers.
