NXP Semiconductors PXN2020 - 13.1.3.1 Instruction Unit Features; 13.1.3.2 Integer Unit Features; 13.1.3.3 Load;Store Unit Features; 13.1.3.4 MMU Features

e200z6 Core (Z6)
PXN20 Microcontroller Reference Manual, Rev. 1
13-4 Freescale Semiconductor
— Support for the wait instruction to halt synchronous activity and/or signal intent to enter low
power mode to the CRP.
13.1.3.1 Instruction Unit Features
The features of the instruction unit are the following:
• 64-bit path to cache supports fetching of two 32-bit instructions per clock, or as many as four 16-bit
VLE APU instructions per clock
• Instruction buffer holds as many as six sequential instructions
• Dedicated PC incrementer supporting instruction prefetches
• Branch target address cache with dedicated branch address adder, and branch lookahead logic
supporting single cycle execution of successful lookahead branches
13.1.3.2 Integer Unit Features
The integer unit supports single-cycle execution of most integer instructions:
• 32-bit AU for arithmetic and comparison operations
• 32-bit LU for logical operations
• 32-bit priority encoder for count leading zeros function
• 32-bit single cycle barrel shifter for static shifts and rotates
• 32-bit mask unit for data masking and insertion
• Divider logic for signed and unsigned divides in 6–16 clocks with minimized execution timing
• Pipelined 32x32 hardware multiplier array supports 32x32->32 multiply with three clock latency,
one clock throughput
13.1.3.3 Load/Store Unit Features
The load/store unit supports load, store, and the load multiple/store multiple instructions:
• 32-bit effective address adder for data memory address calculations
• Pipelined operation supports throughput of one load or store operation per cycle
• Dedicated 64-bit interface to memory supports saving and restoring as many as two registers per
cycle for load multiple and store multiple word instructions
13.1.3.4 MMU Features
The features of the MMU are as follows:
• Virtual memory support
• 32-bit virtual and physical addresses
• Eight-bit process identifier
• 32-entry fully associative TLB
• Support for nine page sizes (4, 16, 64, and 256 KB; 1, 4, 16, 64, and 256 MB)
• Entry flush protection