5796574224

Standardy napięciowe

Table 1: Standards Supported by l/O (Typical Valuss)

l/O Standard	Reference Voltage (Vref)	Output Source Voltage ^cco)	Board Termination Voltage (Vtt)
LVTTL (2-24 mA)	N/A	3.3	N/A
LVCMOS2	N/A	2.5	N/A
PCI (3V/5V. 33 MHz/66 MHz)	N/A	3.3	N/A
GTL	0.8	N/A	1.2
GTL+	1.0	N/A	1,5
HSTL Class I	0.75	1.5	0.75
HSTL Class III	0.9	1.5	1.5
HSTL Class IV	0.9	1.5	1.5
SSTL3 Class I and II	1.5	3.3	1.5
SSTL2 Class I and II	1.25	2.5	125
CTT	1.5	3.3	1.5
AGP-2X	1.32	3.3	N/A

Untermlnaled

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Unlermlnated Outpul Drlvhg a Parallel Terminated Input

Series Terminated Outpul

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Figurę 40: Overview of Terminat

Double Parallel Terminated

Series Terminated Output Drlvlng a Parallel Terminated Input

Series-Parallel Terminated Outpul Drlvlng a Parallel Terminated Inpul

Standard Input and Output ion Methods