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SMC Networks AHB SRAM/NOR, PL241 manual Reads followed by writes Writes followed by reads

Models: AHB SRAM/NOR PL241

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Functional Overview

Synchronous read and asynchronous write

Table 2-20and Table 2-21list the smc_opmode0_<0-3> and SRAM Register settings.

Table 2-20 Synchronous read and asynchronous write opmode chip register settings

Field	mw	rd_sync	rd_bl	wr_sync	wr_bl	baa	adv	bls	ba

Value	-	b1	b001	b0	b000	b0	b1	b0	-

Table 2-21 Synchronous read and asynchronous write opmode chip register settings

Field	t_rc	t_wc	t_ceoe	t_wp	t_pc	t_tr

Value	b0100	b0110	b010	b001	-	b011

Figure 2-23 on page 2-38shows the turnaround time tTR, enforced between synchronous read and asynchronous write. The turnaround time is enforced between:

•Reads followed by writes

•Writes followed by reads

•Read following a read from a different chip select.

ARM DDI 0389B

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SMC Networks AHB SRAM/NOR, PL241 manual Reads followed by writes Writes followed by reads

Contents

PrimeCell AHB SRAM/NOR Memory Controller PL241 Technical Reference ManualRevision r0p1 Technical Reference Manual PrimeCell AHB SRAM/NOR Memory Controller PL241Release Information Proprietary NoticePreface ContentsChapter IntroductionProgrammer’s Model for Test Signal DescriptionsDevice Driver Requirements Appendix AList of Tables Register summary List of Figures Synchronous burst read in multiplexed-mode About this manual on page PrefaceFeedback on page Copyright 2006 ARM Limited. All rights reservedAbout this manual Using this manualProduct revision status whereTypographical Timing diagrams on page Appendix A Signal DescriptionsConventions TypographicalSignals Timing diagramsSignal level Denotes global Advanced eXtensible Interface AXI signalsDenotes Advanced Peripheral Bus APB signals Denotes Advanced High-performance Bus AHB signalsAMBA 3 APB Protocol v1.0 Specification ARM IHI Prefix BFeedback Feedback on this productFeedback on this manual Introduction ChapterAbout 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 1.1.2 AHB to APB bridge 1.1.1 AHB interface1.1.5 Low-power interfaces Pseudo Static Random Access Memory PSRAM1.1.3 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 description on page Functional OverviewFunctional operation on page SMC functional operation on page Chapter2.1 Functional description Low-power interface on pageAHB interface AHB to APB bridge Clock domains on page 2.1.1 AHB interface2.1.4 Low-power interface smcmreset0n2.1.3 Clock domains AHB clock domainSMC interface on page APB slave interface on page 2.2 SMCMemory manager on page Memory interface on page Pad interface on page Figure 2-3 SMC block diagram2.2.2 APB slave interface 2.2.1 SMC interface2.2.3 Format 2.2.4 Memory manager2.2.7 Interrupts 2.2.6 Pad interfaceBroken bursts on page Bufferable bit of the HPROT signal on page Clock domain operation on page Low-power interface operation 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 Registered HWDATA Removal of AHB error response logicBig-endian 32-bit mode 2.3.2 AHB to APB bridge operationFigure 2-6 AHBC memory map 2.3.3 Clock domain operation2.3.4 Low-power interface operation Static memory clocking optionsa request input domaincsyreq an acknowledge output domaincsysack an active output domaincactive Figure 2-9 Accepting requests Miscellaneous signals on page APB slave interface operation on page Operating states Clocking and resets on pageReset Power is applied to the device, and hresetn is held LOWReset to Ready Ready to ResetReady to Low-power Low-power to ReadyAHB domain ResetsMemory clock domain Synchronous clockingsmcuserconfig70 2.4.3 Miscellaneous signalssmcuserstatus70 smcagtm0syncsmcmsync0 Hazard handling SRAM memory accesses on pagesmcrstbypass smcuseebiSRAM memory accesses Standard SRAM access Memory address shifting Memory burst alignmentMemory burst length on page Booting using the SRAM on page Memory burst length Booting using the SRAMDirect commands on page Low-power operation Chip configuration registersLow-power operation Chip configuration registersDSEBLI Figure 2-11 Chip configuration registersPHPFBFIJ VHWF\FOHV VHWRSPRGH FKLSF\FOHV FKLSRSPRGHDirect commands Device pin mechanismSoftware mechanism Functional Overview Figure 2-12 Device pin mechanism6WDUW ULWHWLPLQJSDUDPHWHUV DQGRSHUDWLQJPRGHWR WKHPHPRU\FRQWUROOHU KROGLQJUHJLVWHUV ULWHUHTXLUHGHWHUQDOFKLSFunctional Overview Figure 2-13 Software mechanismCopyright 2006 ARM Limited. All rights reserved ARM DDI 0389BSRAM timing tables and diagrams They are divided into SRAM timing tables and diagrams2.4.7 Interrupts operation 2.4.8 Memory interface operationAsynchronous write on page Asynchronous read Asynchronous read in multiplexed-mode 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 Asynchronous write in multiplexed-mode Table 2-10 Page read opmode chip register settingsFigure 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 2-17 Synchronous burst write SRAM cycles register settings Table 2-16 Synchronous burst write opmode chip 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 Copyright 2006 ARM Limited. All rights reserved Functional OverviewARM DDI 0389B 2-40About the programmer’s model on page Register summary on page Programmer’s ModelRegister descriptions on page ChapterSMC chip select configuration registers SMC configuration registersSMC user configuration registers 3.1 About the programmer’s modelFigure 3-2 SMC configuration register map 3.2 Register summaryFigure 3-3 SMC chip configuration register map Programmer’s ModelReset value Figure 3-4 SMC user configuration register mapName Base offsetTable 3-1 Register summary continued Reset valueName Base offset3.3.1 SMC Memory Controller Status Register at 3.3 Register descriptionsFigure 3-7 smcmemifcfg Register bit assignments 3.3.2 SMC Memory Interface Configuration Register atTable 3-3 smcmemifcfg Register bit assignments BitsTable 3-3 smcmemifcfg Register bit assignments continued 3.3.3 SMC Set Configuration Register atBits 3.3.4 SMC Clear Configuration Register at 0x100CName Function3.3.5 SMC Direct Command Register at 3.3.6 SMC Set Cycles Register at Figure 3-12 smcsetopmode Register bit assignments 3.3.7 SMC Set Opmode Register atBits Table 3-8 lists the register bit assignmentsName FunctionTable 3-8 smcsetopmode Register bit assignments continued Configuration Register at 0x1004 on pageBits Name3.3.9 SMC SRAM Cycles Registers 0-3 at 0x1100, 0x1120, 0x1140 3.3.8 SMC Refresh Period 0 Register at3.3.10 SMC Opmode Registers 0-3 at 0x1104, 0x1124, 0x1144 Bits Table 3-11 lists the register bit assignmentsName FunctionTable 3-12 lists the register bit assignments 3.3.11 SMC User Status Register atTable 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 1 on page SMC Peripheral Identification RegisterSMC 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 2 on page SMC PrimeCell Identification RegisterSMC 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 SMC integration test registers on page Programmer’s Model for TestChapter Copyright 2006 ARM Limited. All rights reserved4.1 SMC integration test registers 4.1.1 SMC Integration Configuration Register at 0x1E00Integration Inputs Register at 0x1E04 4.1.2Table 4-3 smcintinputs Register bit assignments continued 4.1.3 Integration Outputs Register at 0x1E08Bits NameMemory initialization on page Device Driver RequirementsChapter Copyright 2006 ARM Limited. All rights reserved5.1 Memory initialization 6WDUW QLWLDOLHYDULDEOHV ULWHWLPLQJLQIRUPDWLRQ WRVPFBVHWBF\FOHV Figure 5-1 SMC and memory initialization sheet 1 ofKROGLQJ5HJLVWHU ULWHRSHUDWLQJPRGH LQIRUPDWLRQWR VPFBVHWBRSPRGH KROGLQJ5HJLVWHUDevice Driver Requirements Figure 5-2 SMC and memory initialization sheet 2 of6KHHW V PHPRU\GHYLFH 0RGH5HJDFFHVVHGE\ RUDGGUHVV RQO\Device Driver Requirements Figure 5-3 SMC and memory initialization sheet 3 of6KHHW 9HULI\ WKHQHZWLPLQJV DQGRSHUDWLQJ PRGH HV KHFNIRUFRUUHFW VPFBVUDPBF\FOHVB 5HJLVWHUFRQWHQWVDevice Driver Requirements Copyright 2006 ARM Limited. All rights reservedARM DDI 0389B About the signals list on page A-2 Clocks and resets on page A-3 Signal DescriptionsAHB 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-7Figure A-1 AHB MC PL241 grouping of signals A.1 About the signals listSignal Descriptions ORFNVName A.2 Clocks and resetsType SourceTable A-2 AHB signals AHB signalsName TypeTable A-3 SMC memory interface signals A.4 SMC memory interface signalsName TypeTable A-4 SMC miscellaneous signals A.5 SMC miscellaneous signalsName TypeName A.6 Low-power interfaceType SourceTable A-6 Configuration signal A.7 Configuration signalSignal Descriptions NameTable A-7 Scan chain signals A.8 Scan chainsName TypeA-10 Signal DescriptionsCopyright 2006 ARM Limited. All rights reserved ARM DDI 0389BGlossary See Advanced Microcontroller Bus Architecture See Advanced High-performance BusSee Advanced Peripheral Bus comprises four beatsincremented See also BeatSee Should Be One to enable you to access selected parts of the deviceSee Should Be Zero See Should Be Zero or Preservedhas been completed Glossary-6 GlossaryCopyright 2006 ARM Limited. All rights reserved ARM DDI 0389B