MicroBlaze Architecture | Xilinx EDK 8.2i specification

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Chapter 1: MicroBlaze Architecture

In addition to these ﬁxed features the MicroBlaze processor is parametrized to allow selective enabling of additional functionality. Older (deprecated) versions of MicroBlaze support a subset of the optional features described in this manual. Only the latest (active) version of MicroBlaze (v5.00a) supports all options.

Xilinx recommends that all new designs use the latest active version of the MicroBlaze processor.

Table 1-1:Conﬁgurable Feature Overview by MicroBlaze Version

	Feature		MicroBlaze Versions

		v2.10a	v3.00a	v4.00a	v5.00a
		v2.10a	v3.00a	v4.00a	v5.00a

	Version Status	deprecated	deprecated	deprecated	active
	Processor pipeline depth	3	3	3	5

	On-chip Peripheral Bus (OPB) data side interface	option	option	option	option

	On-chip Peripheral Bus (OPB) instruction side interface	option	option	option	option

	Local Memory Bus (LMB) data side interface	option	option	option	option

	Local Memory Bus (LMB) instruction side interface	option	option	option	option

	Hardware barrel shifter	option	option	option	option

	Hardware divider	option	option	option	option

	Hardware debug logic	option	option	option	option

	Fast Simplex Link (FSL) interfaces	0-7	0-7	0-7	0-7

	Machine status set and clear instructions	option	option	option	Yes

	Instruction cache over IOPB interface	option	option	option	No

	Data cache over IOPB interface	option	option	option	No

	Instruction cache over CacheLink (IXCL) interface	-	option	option	option

	Data cache over CacheLink (DXCL) interface	-	option	option	option

	4 or 8-word cache line on XCL	-	4	4	option

	Hardware exception support	-	option	option	option

	Pattern compare instructions	-	-	option	Yes

	Floating point unit (FPU)	-	-	option	option

	Disable hardware multiplier1	-	-	option	option
	Hardware debug readable ESR and EAR	-	-	Yes	Yes

	Processor Version Register (PVR)	-	-	-	option

1. Used in Virtex-II and subsequent families, for saving MUL18 and DSP48 primitives

12	www.xilinx.com	MicroBlaze Processor Reference Guide
	1-800-255-7778	UG081 (v6.0) June 1, 2006

Image 12

Xilinx EDK 8.2i manual MicroBlaze Architecture, Version Status Deprecated Active

Contents

MicroBlaze Processor Reference Guide UG081 v6.0 June 1 MicroBlaze Processor Reference Guide MicroBlaze Processor Reference Guide UG081 v6.0 June 1 Date Version Revision UG081 v6.0 June 1 Preface About This Guide MicroBlaze Application Binary Interface Manual Contents Additional Resources Conventions Typographical Online Document Conventions Meaning or Use Example UG081 v6.0 June 1 Features Overview MicroBlaze Architecture Version Status Deprecated Active Data Types and Endianness Instructions MSR ESREAR FSR Op1 if cond else op2 MicroBlaze Processor Reference Guide MicroBlaze Processor Reference Guide UG081 v6.0 June 1 MicroBlaze Processor Reference Guide MicroBlaze Processor Reference Guide UG081 v6.0 June 1 Registers General Purpose Registers Special Purpose RegistersProgram Counter PC Registers 8Program Counter PC Bits Name Description Reset Value Machine Status Register MSR9Machine Status Register MSR Bits Name Description PVR EIP DCEICE FSL Buslock Enable Exception Address Register EAR Exception Status Register ESR ESS Branch Target Register BTR Source/Destination Register Floating Point Status Register FSR Processor Version Register PVR CFG CusebarrelDIV Cusediv Cdebugenabled OP0EXECUnexec Cunalignedexception Icll CicachelinelenIcbs Ccachebytesize Cresetmsr Pipeline ArchitectureArch Rstmsr Delay Slots Memory ArchitectureBranches Reset, Interrupts, Exceptions, and Break Reset, Interrupts, Exceptions, and Break Reset Hardware ExceptionsEquivalent Pseudocode Exception Causes Breaks Hardware Breaks Interrupt User Vector ExceptionSoftware Breaks Latency Instruction Cache OverviewGeneral Instruction Cache Functionality Instruction Cache Data Cache Instruction Cache OperationInstruction Cache Software Support MSR Bit General Data Cache Functionality Data Cache OperationData Cache Floating Point Unit FPU Data Cache Software SupportWDC Instruction Format RoundingOperations Arithmetic Hardware Acceleration using FSL Fast Simplex Link FSLExceptions Comparison Debug and Trace Debug OverviewTrace Overview MicroBlaze Architecture MicroBlaze I/O Overview IlmbIxcl Dxcl MicroBlaze Signal Interface Description Dmrnw Dopb Imrnw Iopb DAS DlmbIAS Ilmb Mfsl On-Chip Peripheral Bus OPB Interface Description IxclmDxcls Dxclm LMB Signal Interface ByteEnable03Local Memory Bus LMB Interface Description Addr031 DataWrite031 ReadStrobeWriteStrobe DataRead031 LMB Transactions Generic Write OperationGeneric Read Operation Back-to-Back Write Operation Single Cycle Back-to-Back Read OperationBack-to-Back Mixed Read/Write Operation BE0 BE1 BE2 Read and Write Data Steering RD1623 RD2431RD07 RD815 RD1623 RD2431 Master FSL Signal Interface Slave FSL Signal InterfaceFast Simplex Link FSL Interface Description Xilinx CacheLink XCL Interface Description FSL TransactionsFSL BUS Write Operation FSL BUS Read Operation CacheLink Signal Interface CacheLink Transactions Instruction Cache Read Miss Data Cache Read MissData Cache Write Debug Interface Description Trace Interface DescriptionDebug Interface Description MDM MicroBlaze Processor Reference Guide MicroBlaze Core Conﬁgurability 11 Type of Trace Exception TraceExceptionKind Description Values Assigned Type Cusepcmpinstr CusemsrinstrPcmpne Cunalignedexception Cnumberofrdaddrbrk Ffff CicacheusefslCdcacheusefsl Scope Data Types Register Usage Conventions MicroBlaze Application Binary Interface2Register usage conventions Type Enforcement Purpose Stack Convention Stack Convention High Memory Low Memory Func Memory Model Interrupt and Exception Handling 1Symbol notation Meaning SummaryNotation Formats Type aType B Opcode Destination Reg Source Reg a Immediate Value Add DescriptionRegisters Altered Addi Registers Altered Latency RD, rA, rB Andi Logial and with Immediate Andi RD, rA, IMM Andn Logical and notAndn RD, rA, rB Andni Logical and not with Immediate Andni RD, rA, IMM Beq Branch if Equal BeqBeqd Beqi Branch Immediate if Equal BeqiBeqid Bge Branch if Greater or Equal BgeBged Bgei Branch Immediate if Greater or Equal BgeiBgeid Bgt Branch if Greater Than BgtBgtd Bgti Branch Immediate if Greater Than BgtiBgtid Ble Branch if Less or Equal BleBled Blei Branch Immediate if Less or Equal BleiBleid Blt Branch if Less Than Blt Blti BltiBltid Bne Branch if Not Equal BneBned Bnei Branch Immediate if Not Equal BneiBneid Instructions Unconditional Branch BraBrd Brad MicroBlaze Instruction Set Architecture Bri MicroBlaze Instruction Set Architecture Instructions BrkBreak RD, rB Msrbip Brki Break Immediate Brki RD, IMM Instructions Barrel Shift Bsrl BsraBsll Bsi Barrel Shift Immediate BsrliBsrai Bslli Cmp Integer Compare CmpCmpu Fadd Floating Point Arithmetic Add FaddEsrec FSRIO,UF,OF,DO Frsub Reverse Floating Point Arithmetic SubtractionFrsub RD, rA, rB Reverse subtract Fmul Floating Point Arithmetic Multiplication Fmul Fdiv Floating Point Arithmetic DivisionFdiv RD, rA, rB Divide Esrec FSRIO,UF,OF,DO,DZ Fcmp Esrec FSRIO,DO Get Get from fsl interfaceNget Cget Idiv Integer Divide IdivIdivu Imm Immediate ImmIMM Lbu Load Byte UnsignedLbu RD, rA, rB Lbui Load Byte Unsigned Immediate Lbui RD, rA, IMM Lhu Lhu RD, rA, rB Lhui Load Halfword Unsigned Immediate Lhui RD, rA, IMM Load Word Lwi Load Word Immediate Lwi RD, rA, IMM Mfs Mfs RD, rS Msrclr Read MSR and clear bits in MSR Msrclr RD, Imm Msrset Msrset RD, Imm Mts Move To Special Purpose Register Mts RS, rA Instructions Mul Multiply RD, rA, rB Muli Multiply Immediate Muli RD, rA, IMM Logical or Ori Logical or with Immediate Ori RD, rA, IMM Pcmpbf Pattern Compare Byte Find Pcmpbf Pcmpeq Pattern Compare Equal Pcmpeq Pcmpne Pattern Compare Not Equal Pcmpne Put Put to fsl interfaceNput Cput Rsub Arithmetic Reverse Subtract RsubRsubc Rsubk Rsubi Arithmetic Reverse Subtract Immediate RsubiRsubic Rsubik Rtbd Return from BreakRtbd RA, IMM Rtid Return from Interrupt Rtid RA, IMMMsrie Rted Return from Exception Rted RA, IMMMsree Msreip ESR Rtsd Return from Subroutine Rtsd RA, IMM None Sbi Store Byte Immediate Sbi RD, rA, IMM Sext16 Sext16 RD, rA Sext8 Sign Extend ByteSext8 RD, rA Instructions Store Halfword RD, rA, rB Shi Store Halfword Immediate Shi RD, rA, IMM Sra Sra RD, rA Src Shift Right with Carry Src RD, rA Srl Shift Right LogicalSrl RD, rA Addr ← rA + rB Addr3031 ← MemAddr ← rD031 Register Altered Store Word Immediate Swi RD, rA, IMM Wdc Write to Data Cache Wic Xor Logical Exclusive or Xor RD, rA, rB Xori Logical Exclusive or with ImmediateXori RA, rD, IMM 148