Manuals / SMC Networks / Computer Equipment / Network Card

SMC Networks PL241 See Should Be One, See Should Be Zero or Preserved, Unpredictable results

Models: AHB SRAM/NOR PL241

1 110

Download 110 pages 44.4 Kb

Page 108

Glossary

SBO	See Should Be One.
SBZ	See Should Be Zero.
SBZP	See Should Be Zero or Preserved.
Scan chain	A scan chain is made up of serially-connected devices that implement boundary scan
	technology using a standard JTAG TAP interface. Each device contains at least one TAP
	controller containing shift registers that form the chain connected between TDI and
	TDO, through which test data is shifted. Processors can contain several shift registers
	to enable you to access selected parts of the device.
Should Be One (SBO)
	Should be written as 1 (or all 1s for bit fields) by software. Writing a 0 produces
	Unpredictable results.
Should Be Zero (SBZ)
	Should be written as 0 (or all 0s for bit fields) by software. Writing a 1 produces
	Unpredictable results.

Should Be Zero or Preserved (SBZP)

Should be written as 0 (or all 0s for bit fields) by software, or preserved by writing the same value back that has been previously read from the same field on the same processor.

Unaligned	A data item stored at an address that is not divisible by the number of bytes that defines
	the data size is said to be unaligned. For example, a word stored at an address that is not
	divisible by four.
Undefined	Indicates an instruction that generates an Undefined instruction trap. See the ARM
	Architecture Reference Manual for more information on ARM exceptions.
UNP	See Unpredictable.
Unpredictable	Means that the behavior of the ETM cannot be relied on. Such conditions have not been
	validated. When applied to the programming of an event resource, only the output of
	that event resource is Unpredictable.
	Unpredictable behavior can affect the behavior of the entire system, because the ETM
	is capable of causing the core to enter debug state, and external outputs can be used for
	other purposes.
Unpredictable	For reads, the data returned when reading from this location is unpredictable. It can have
	any value. For writes, writing to this location causes unpredictable behavior, or an
	unpredictable change in device configuration. Unpredictable instructions must not halt
	or hang the processor, or any part of the system.

Glossary-4

Copyright © 2006 ARM Limited. All rights reserved.

ARM DDI 0389B

Image 108

SMC Networks PL241, AHB SRAM/NOR manual See Should Be One, See Should Be Zero or Preserved, Unpredictable results

Contents

PrimeCell AHB SRAM/NOR Memory Controller PL241 Technical Reference ManualRevision r0p1 PrimeCell AHB SRAM/NOR Memory Controller PL241 Technical Reference ManualRelease Information Proprietary NoticeContents PrefaceChapter IntroductionSignal Descriptions Programmer’s Model for TestDevice Driver Requirements Appendix AList of Tables Register summary List of Figures Synchronous burst read in multiplexed-mode Preface About this manual on pageFeedback on page Copyright 2006 ARM Limited. All rights reservedUsing this manual About this manualProduct revision status whereAppendix A Signal Descriptions Typographical Timing diagrams on pageConventions TypographicalTiming diagrams SignalsSignal level Denotes global Advanced eXtensible Interface AXI signalsDenotes Advanced High-performance Bus AHB signals Denotes Advanced Peripheral Bus APB signalsAMBA 3 APB Protocol v1.0 Specification ARM IHI Prefix BFeedback Feedback on this productFeedback on this manual Chapter IntroductionAbout the AHB MC on page Supported devices on page Copyright 2006 ARM Limited. All rights reservedClock domains on page Low-power interfaces on page 1.1 About the AHB MCAHB interface on page AHB to APB bridge on page 1.1.1 AHB interface 1.1.2 AHB to APB bridgePseudo Static Random Access Memory PSRAM 1.1.5 Low-power interfaces1.1.3 SMC 1.1.4 Clock domains1.2 Supported devices Intel W18 series NOR FLASH, for example 28f128W18tdCellular RAM 1.0, 64MB PSRAM, for example mt45w4mw16bfb7011us Introduction Copyright 2006 ARM Limited. All rights reservedARM DDI 0389B Functional Overview Functional description on pageFunctional operation on page SMC functional operation on page ChapterLow-power interface on page 2.1 Functional descriptionAHB interface AHB to APB bridge Clock domains on page 2.1.1 AHB interfacesmcmreset0n 2.1.4 Low-power interface2.1.3 Clock domains AHB clock domain2.2 SMC SMC interface on page APB slave interface on pageMemory manager on page Memory interface on page Pad interface on page Figure 2-3 SMC block diagram2.2.1 SMC interface 2.2.2 APB slave interface2.2.3 Format 2.2.4 Memory manager2.2.6 Pad interface 2.2.7 InterruptsClock domain operation on page Low-power interface operation on page Broken bursts on page Bufferable bit of the HPROT signal on pageAHB response signals on page Locked transfers on page Removal of AHB error response logic on pageBufferable bit of the HPROT signal Undefined length INCR burstsBroken bursts AHB response signals Read after write hazard detection bufferLocked transfers Removal of AHB error response logic Registered HWDATABig-endian 32-bit mode 2.3.2 AHB to APB bridge operation2.3.3 Clock domain operation Figure 2-6 AHBC memory map2.3.4 Low-power interface operation Static memory clocking optionsa request input domaincsyreq an acknowledge output domaincsysack an active output domaincactive Figure 2-9 Accepting requests Operating states Clocking and resets on page Miscellaneous signals on page APB slave interface operation on pageReset Power is applied to the device, and hresetn is held LOWReady to Reset Reset to ReadyReady to Low-power Low-power to ReadyResets AHB domainMemory clock domain Synchronous clocking2.4.3 Miscellaneous signals smcuserconfig70smcuserstatus70 smcagtm0syncHazard handling SRAM memory accesses on page smcmsync0smcrstbypass smcuseebiSRAM memory accesses Standard SRAM access Memory address shifting Memory burst alignmentMemory burst length on page Booting using the SRAM on page Booting using the SRAM Memory burst lengthLow-power operation Chip configuration registers Direct commands on pageLow-power operation Chip configuration registersFigure 2-11 Chip configuration registers DSEBLIPHPFBFIJ VHWF\FOHV VHWRSPRGH FKLSF\FOHV FKLSRSPRGHDirect commands Device pin mechanismSoftware mechanism Figure 2-12 Device pin mechanism Functional Overview6WDUW ULWHWLPLQJSDUDPHWHUV DQGRSHUDWLQJPRGHWR WKHPHPRU\FRQWUROOHU KROGLQJUHJLVWHUV ULWHUHTXLUHGHWHUQDOFKLSFigure 2-13 Software mechanism Functional OverviewCopyright 2006 ARM Limited. All rights reserved ARM DDI 0389BThey are divided into SRAM timing tables and diagrams SRAM timing tables and diagrams2.4.7 Interrupts operation 2.4.8 Memory interface operationAsynchronous read Asynchronous read in multiplexed-mode on page Asynchronous write on pageAsynchronous write in multiplexed-mode on page Asynchronous page mode read on page Synchronous burst read on pageFigure 2-14 Asynchronous read Asynchronous read in multiplexed-modeFigure 2-15 Asynchronous read in multiplexed-mode smcdataout0310 output bus. Read data is accepted on the smcdatain0310 Table 2-10 Page read opmode chip register settings Asynchronous write in multiplexed-modeFigure 2-17 Asynchronous write in multiplexed-mode Asynchronous page mode readMultiplexed-mode page accesses are not supported Figure 2-19 Synchronous burst read Figure 2-20 Synchronous burst read in multiplexed-mode Table 2-16 Synchronous burst write opmode chip register settings Table 2-17 Synchronous burst write SRAM cycles register settingsSynchronous burst write Figure 2-21 Synchronous burst writeFigure 2-22 Synchronous burst write in multiplexed-mode Reads followed by writes Writes followed by reads For tRC For tWC Functional Overview Copyright 2006 ARM Limited. All rights reservedARM DDI 0389B 2-40Programmer’s Model About the programmer’s model on page Register summary on pageRegister descriptions on page ChapterSMC configuration registers SMC chip select configuration registersSMC user configuration registers 3.1 About the programmer’s model3.2 Register summary Figure 3-2 SMC configuration register mapFigure 3-3 SMC chip configuration register map Programmer’s ModelFigure 3-4 SMC user configuration register map Reset valueName Base offsetReset value Table 3-1 Register summary continuedName Base offset3.3 Register descriptions 3.3.1 SMC Memory Controller Status Register at3.3.2 SMC Memory Interface Configuration Register at Figure 3-7 smcmemifcfg Register bit assignmentsTable 3-3 smcmemifcfg Register bit assignments Bits3.3.3 SMC Set Configuration Register at Table 3-3 smcmemifcfg Register bit assignments continued3.3.4 SMC Clear Configuration Register at 0x100C BitsName Function3.3.5 SMC Direct Command Register at 3.3.6 SMC Set Cycles Register at 3.3.7 SMC Set Opmode Register at Figure 3-12 smcsetopmode Register bit assignmentsTable 3-8 lists the register bit assignments BitsName FunctionConfiguration Register at 0x1004 on page Table 3-8 smcsetopmode Register bit assignments continuedBits Name3.3.8 SMC Refresh Period 0 Register at 3.3.9 SMC SRAM Cycles Registers 0-3 at 0x1100, 0x1120, 0x11403.3.10 SMC Opmode Registers 0-3 at 0x1104, 0x1124, 0x1144 Table 3-11 lists the register bit assignments BitsName Function3.3.11 SMC User Status Register at Table 3-12 lists the register bit assignmentsTable 3-11 smcopmode Register bit assignments continued Bits3.3.12 SMC User Configuration Register at Table 3-13 lists the register bit assignments3.3.13 SMC Peripheral Identification Registers 0-3 at 0x1FE0-0x1FEC SMC Peripheral Identification Register SMC Peripheral Identification Register 1 on pageSMC Peripheral Identification Register 2 on page SMC Peripheral Identification Register 3 on pageSMC Peripheral Identification Register SMC Peripheral Identification RegisterSMC Peripheral Identification Register Table 3-18 smcperiphid3 Register bit assignments3.3.14 SMC PrimeCell Identification Registers 0-3 at 0x1FF0-0x1FFC SMC PrimeCell Identification Register SMC PrimeCell Identification Register 2 on pageSMC PrimeCell Identification Register 3 on page SMC PrimeCell Identification RegisterSMC PrimeCell Identification Register The smcpcellid2 Register is hard-coded and the fields within the register indicate the value. Table 3-22 lists the register bit assignmentsSMC PrimeCell Identification Register Programmer’s Model for Test SMC integration test registers on pageChapter Copyright 2006 ARM Limited. All rights reserved4.1.1 SMC Integration Configuration Register at 0x1E00 4.1 SMC integration test registers4.1.2 Integration Inputs Register at 0x1E044.1.3 Integration Outputs Register at 0x1E08 Table 4-3 smcintinputs Register bit assignments continuedBits NameDevice Driver Requirements Memory initialization on pageChapter Copyright 2006 ARM Limited. All rights reserved5.1 Memory initialization Figure 5-1 SMC and memory initialization sheet 1 of 6WDUW QLWLDOLHYDULDEOHV ULWHWLPLQJLQIRUPDWLRQ WRVPFBVHWBF\FOHVKROGLQJ5HJLVWHU ULWHRSHUDWLQJPRGH LQIRUPDWLRQWR VPFBVHWBRSPRGH KROGLQJ5HJLVWHUFigure 5-2 SMC and memory initialization sheet 2 of Device Driver Requirements6KHHW V PHPRU\GHYLFH 0RGH5HJDFFHVVHGE\ RUDGGUHVV RQO\Figure 5-3 SMC and memory initialization sheet 3 of Device Driver Requirements6KHHW 9HULI\ WKHQHZWLPLQJV DQGRSHUDWLQJ PRGH HV KHFNIRUFRUUHFW VPFBVUDPBF\FOHVB 5HJLVWHUFRQWHQWVDevice Driver Requirements Copyright 2006 ARM Limited. All rights reservedARM DDI 0389B Signal Descriptions About the signals list on page A-2 Clocks and resets on page A-3AHB signals on page A-4 SMC memory interface signals on page A-5 SMC miscellaneous signals on page A-6 Low-power interface on page A-7A.1 About the signals list Figure A-1 AHB MC PL241 grouping of signalsSignal Descriptions ORFNVA.2 Clocks and resets NameType SourceAHB signals Table A-2 AHB signalsName TypeA.4 SMC memory interface signals Table A-3 SMC memory interface signalsName TypeA.5 SMC miscellaneous signals Table A-4 SMC miscellaneous signalsName TypeA.6 Low-power interface NameType SourceA.7 Configuration signal Table A-6 Configuration signalSignal Descriptions NameA.8 Scan chains Table A-7 Scan chain signalsName TypeSignal Descriptions A-10Copyright 2006 ARM Limited. All rights reserved ARM DDI 0389BGlossary See Advanced High-performance Bus See Advanced Microcontroller Bus ArchitectureSee Advanced Peripheral Bus comprises four beatsSee also Beat incrementedto enable you to access selected parts of the device See Should Be OneSee Should Be Zero See Should Be Zero or Preservedhas been completed Glossary Glossary-6Copyright 2006 ARM Limited. All rights reserved ARM DDI 0389B