Texas Instruments VLYNQ Port Table B-1. Scaling Factors, Burst Size in 32-bit words Data Bytes

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Write Performance

Table B-1. Scaling Factors

Burst Size in 32-bit words	Data Bytes	Overhead Bytes	Scaling Factor
1	4	6	40%
4	16	7	69.56%
8	32	7	82.05%
16	64	7	90.14%

Table B-2. Expected Throughput (VLYNQ Interface Running at 76.5 MHZ and 99 MHZ)

	Burst Size in	Interface Running at 76.5 MHZ		Interface Running at 99 MHZ
	Burst Size in
Number of VLYNQ Pins	32-bit Words	Mbits/sec	Mbytes/sec	Mbits/sec	Mbytes/sec
1	1	24.19	3.02	31.68	3.96
	4	42.07	5.26	55.09	6.89
	8	49.62	6.20	64.98	8.12
	16	54.52	6.81	71.39	8.92
2	1	48.38	6.05	63.36	7.92
	4	84.14	10.52	110.18	13.77
	8	99.25	12.41	129.97	16.25
	16	109.03	13.63	142.78	17.85
3	1	72.58	9.07	95.04	11.88
	4	126.21	15.78	165.27	20.66
	8	148.87	18.61	194.95	24.37
	16	163.55	20.44	214.17	26.77
4	1	96.77	12.10	126.72	15.84
	4	168.28	21.03	220.37	27.55
	8	198.50	24.81	259.93	32.49
	16	218.07	27.26	285.56	35.70

46	Write/Read Performance	SPRUE36A –September 2007
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Contents Users Guide Submit Documentation Feedback Contents Appendix B Appendix CList of Figures List of Tables Notational Conventions About This DocumentRelated Documentation From Texas Instruments Trademarks Introduction FeaturesPurpose of the Peripheral Functional Block Diagram Industry Standards Compliance StatementPeripheral Architecture Clock ControlPin Multiplexing Signal DescriptionsVlynq Port Pins Protocol DescriptionVlynq Functional Description Vlynq Module StructureWrite Operations TxSMRead Operations Auto-Negotiation Serial Interface Width ConfigurationInitialization Serial Interface WidthAddress Translation Address Translation Example Single Mapped Region Register DM644x Vlynq ModuleDM644x Vlynq Module Remote Vlynq ModuleFlow Control Example 1. Address Translation ExampleHardware Reset Considerations Reset ConsiderationsSoftware Reset Considerations Interrupt SupportInterrupt Generation Mechanism Block Diagram Writes to Interrupt Pending/Set RegisterDMA Event Support Serial Bus Error InterruptsRemote Interrupts Power Management Emulation ConsiderationsVlynq Port Controller Registers Vlynq Port RegistersVlynq Register Address Space Block Name Start Address End Address SizeRevmaj Revmin Revision Register RevidRevision Register Revid Field Descriptions Bit Field Value DescriptionControl Register Ctrl Control Register Ctrl Field DescriptionsAoptdisable Bit FieldStatus Register Stat Status Register Stat Field DescriptionsNo error LerrorNointpend Interrupt Priority Vector Status/Clear Register IntpriInterrupt Status/Clear Register Intstatclr InstatInterrupt Pointer Register Intptr Field Descriptions Interrupt Pending/Set Register IntpendsetInterrupt Pointer Register Intptr IntsetAddress Map Register XAM Field Descriptions Transmit Address Map Register XAMTxadrmap RXADRSIZE1 Receive Address Map Size 1 Register RAMS1Receive Address Map Offset 1 Register RAMO1 RXADROFFSET1RXADRSIZE2 Receive Address Map Size 2 Register RAMS2Receive Address Map Offset 2 Register RAMO2 RXADROFFSET2RXADRSIZE3 Receive Address Map Size 3 Register RAMS3Receive Address Map Offset 3 Register RAMO3 RXADROFFSET3RXADRSIZE4 Receive Address Map Size 4 Register RAMS4Receive Address Map Offset 4 Register RAMO4 RXADROFFSET4Chip Version Register Chipver Field Descriptions Chip Version Register ChipverAuto Negotiation Register Autngo Auto Negotiation Register Autngo Field DescriptionsRemote Configuration Registers Vlynq Port Remote Controller RegistersSupported Ordered Sets Appendix a Vlynq Protocol SpecificationsSpecial 8b/10b Code Groups Table A-1. Special 8b/10b Code GroupsFigure A-1. Packet Format 10-bit Symbol Representation Vlynq 2.0 Packet FormatField Value Description Vlynq 2.X Packets Vlynq 2.X Packets Appendix B Write/Read Performance Write PerformanceBurst Size Interface Running at 76.5 MHZ Table B-1. Scaling FactorsBurst Size in 32-bit words Data Bytes Bit Words Mbits/sec Mbytes/secRead Performance Table B-3. Relative Performance with Various LatenciesTable C-1. Document Revision History Appendix C Revision HistoryAdditions/Modifications/Deletions DSP Products ApplicationsRfid

Table B-1. Scaling Factors

Burst Size in 32-bit words

Data Bytes

Burst Size in

Interface Running at 76.5 MHZ

32-bit Words

Mbits/sec

Mbytes/sec