AX2000 datasheet(28/262 Pages) MICROSEMI

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Detailed Specifications

2- 14

R e v i sio n 1 8

I/O Banks and Compatibility

Since each I/O bank has its own user-assigned input reference voltage (VREF) and an input/output

supply voltage (VCCI), only I/Os with compatible standards can be assigned to the same bank.

Table 2-11 shows the compatible I/O standards for a common VREF (for voltage-referenced standards).

Similarly, Table 2-12 shows compatible standards for a common VCCI.

Table 2-11 • Compatible I/O Standards for Different VREF Values

VREF

Compatible Standards

1.5 V

SSTL 3 (Class I and II)

1.25 V

SSTL 2 (Class I and II)

1.0 V

GTL+ (2.5V and 3.3V Outputs)

0.75 V

HSTL (Class I)

Table 2-12 • Compatible I/O Standards for Different VCCI Values

VCCI1

Compatible Standards

VREF

3.3 V

LVTTL, PCI, PCI-X, LVPECL, GTL+ 3.3 V

1.0

3.3 V

SSTL 3 (Class I and II), LVTTL, PCI, LVPECL

1.5

2.5 V

LVCMOS 2.5 V, GTL+ 2.5 V, LVDS2

1.0

2.5 V

LVCMOS 2.5 V, SSTL 2 (Classes I and II), LVDS2

1.25

1.8 V

LVCMOS 1.8 V

N/A

1.5 V

LVCMOS 1.5 V, HSTL Class I

0.75

Notes:

1. VCCI is used for both inputs and outputs

2. VCCI tolerance is

±5%

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