PXD20 Datasheet, PDF (9/130 Pages) Freescale Semiconductor, Inc – PXD20 Microcontroller

Overview
— Regulates input to generate all internal supplies
— Manages power gating
— External ballast transistor for high power regulator
— Low-Power and Ultra-Low-Power regulators support operation when in STOP and STANDBY modes,
respectively, to minimize power consumption
— Startup on-chip regulators in <350 µs for rapid exit of STOP and STANDBY modes
— Low voltage detection on main supply and 1.2 V regulated supplies.
1.4.2 e200z4d core
The e200z4d Power Architecture core provides the following features:
• Dual issue, 32-bit Power Architecture Book E compliant CPU
• Implements the VLE APU for reduced code footprint
• In-order execution and retirement
• Precise exception handling
• Branch processing unit
— Dedicated branch address calculation adder
— Branch target prefetching using 8-entry BTB
• Supports independent instruction and data accesses to different memory subsystems, such as SRAM and Flash memory
via independent Instruction and Data BIUs.
• Load/store unit
— 2 cycle load latency
— Fully pipelined
— Big and Little endian support
— Misaligned access support
• 64-bit General Purpose Register file
• Dual AHB 2.v6 64-bit System buses
• Memory Management Unit (MMU) with 16-entry fully-associative TLB and multiple page size support
• 4 KB, 2/4-Way Set Associative Instruction Cache
• Signal Processing Extension (SPE1.1) APU supporting SIMD fixed-point operations using the 64-bit General Purpose
Register file.
• Embedded Floating-Point (EFP2) APU supporting scalar and vector SIMD single-precision floating-point operations,
using the 64-bit General Purpose Register file.
• Nexus Class 3 real-time Development Unit
• Dynamic power management of execution units, cache and MMU
1.4.3 Crossbar switch (XBAR)
The XBAR multi-port crossbar switch supports simultaneous connections between seven master ports and eight slave ports.
The crossbar supports a 32-bit address bus width and a 64-bit data bus width.
The crossbar allows concurrent transactions to occur from any master port to any slave port but one of those transfers must be
an instruction fetch from internal flash. If a slave port is simultaneously requested by more than one master port, arbitration
logic selects the higher priority master and grants it ownership of the slave port. All other masters requesting that slave port are
stalled until the higher priority master completes its transactions. Requesting masters having equal priority are granted access
to a slave port in round-robin fashion, based upon the ID of the last master to be granted access.
The crossbar provides the following features:
PXD20 Microcontroller Data Sheet, Rev. 2
Freescale Semiconductor
Preliminary—Subject to Change Without Notice
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