Table B-1. Scaling Factors

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Write Performance

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

Contents

Users Guide Submit Documentation Feedback Contents Appendix B Appendix C List 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 Statement Peripheral Architecture Clock Control Pin Multiplexing Signal DescriptionsVlynq Port Pins Protocol Description Vlynq Functional Description Vlynq Module Structure Write Operations TxSM Read Operations Auto-Negotiation Serial Interface Width ConfigurationInitialization Serial Interface Width Address Translation Address Translation Example Single Mapped Region Register DM644x Vlynq Module DM644x Vlynq Module Remote Vlynq Module Flow Control Example 1. Address Translation Example Hardware Reset Considerations Reset ConsiderationsSoftware Reset Considerations Interrupt Support Interrupt Generation Mechanism Block Diagram Writes to Interrupt Pending/Set Register DMA Event Support Serial Bus Error InterruptsRemote Interrupts Power Management Emulation Considerations Vlynq Port Controller Registers Vlynq Port RegistersVlynq Register Address Space Block Name Start Address End Address Size Revmaj Revmin Revision Register RevidRevision Register Revid Field Descriptions Bit Field Value Description Control Register Ctrl Control Register Ctrl Field Descriptions Aoptdisable Bit Field Status Register Stat Status Register Stat Field Descriptions No error Lerror Nointpend Interrupt Priority Vector Status/Clear Register IntpriInterrupt Status/Clear Register Intstatclr Instat Interrupt Pointer Register Intptr Field Descriptions Interrupt Pending/Set Register IntpendsetInterrupt Pointer Register Intptr Intset Address Map Register XAM Field Descriptions Transmit Address Map Register XAMTxadrmap RXADRSIZE1 Receive Address Map Size 1 Register RAMS1Receive Address Map Offset 1 Register RAMO1 RXADROFFSET1 RXADRSIZE2 Receive Address Map Size 2 Register RAMS2Receive Address Map Offset 2 Register RAMO2 RXADROFFSET2 RXADRSIZE3 Receive Address Map Size 3 Register RAMS3Receive Address Map Offset 3 Register RAMO3 RXADROFFSET3 RXADRSIZE4 Receive Address Map Size 4 Register RAMS4Receive Address Map Offset 4 Register RAMO4 RXADROFFSET4 Chip Version Register Chipver Field Descriptions Chip Version Register ChipverAuto Negotiation Register Autngo Auto Negotiation Register Autngo Field Descriptions Remote Configuration Registers Vlynq Port Remote Controller Registers Supported Ordered Sets Appendix a Vlynq Protocol SpecificationsSpecial 8b/10b Code Groups Table A-1. Special 8b/10b Code Groups Figure A-1. Packet Format 10-bit Symbol Representation Vlynq 2.0 Packet Format Field Value Description Vlynq 2.X Packets Vlynq 2.X Packets Appendix B Write/Read Performance Write Performance Burst Size Interface Running at 76.5 MHZ Table B-1. Scaling FactorsBurst Size in 32-bit words Data Bytes Bit Words Mbits/sec Mbytes/sec Read Performance Table B-3. Relative Performance with Various Latencies Table C-1. Document Revision History Appendix C Revision HistoryAdditions/Modifications/Deletions DSP Products ApplicationsRfid

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

Models: VLYNQ Port

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