AX2000-1CSG896I datasheet(30/226 Pages) ACTEL

30 / 226 page

Axcelerator Family FPGAs

2- 16

v2.7

inputs (e.g. INBUF_LVDS) or a pair of differential

outputs (e.g. OUTBUF_LVPECL).

•

Pull-up and pull-down variations of the INBUF,

BIBUF, and TRIBUF macros. These are available

only with TTL and LVCMOS thresholds. They can

be used to model the behavior of the pull-up and

pull-down resistors available in the architecture.

Whenever an input pin is left unconnected, the

output pin will either go high or low rather than

unknown. This allows users to leave inputs

unconnected without having the negative effect

on simulation of propagating unknowns.

•

DDR_REG macro. It can be connected to any I/O

standard input buffers (i.e. INBUF) to implement a

double data rate register. Designer software will

map it to the I/O module in the same way it maps

the other registers to the I/O module.

Table 2-15, Table 2-16 on page 2-17, and Table 2-17 on

page 2-17

list

all

the

available

macro

names

differentiated by I/O standard, type, slew rate, and drive

strength.

Table 2-15 • Macros for Single-Ended I/O Standards

Standard

VCCI

Macro Names

LVTTL

3.3V

CLKBUF, HCLKBUF

INBUF,

OUTBUF,

OUTBUF_S_8, OUTBUF_S_12, OUTBUF_S_16, OUTBUF_S_24,

OUTBUF_H_8, OUTBUF_H_12, OUTBUF_H_16, OUTBUF_H_24,

TRIBUF,

TRIBUF_S_8, TRIBUF_S_12, TRIBUF_S_16, TRIBUF_S_24,

TRIBUF_H_8, TRIBUF_H_12, TRIBUF_H_16, TRIBUF_H_24,

BIBUF,

BIBUF_S_8, BIBUF_S_12, BIBUF_S_16, BIBUF_S_24,

BIBUF_H_8, BIBUF_H_12, BIBUF_H_16, BIBUF_H_24,

3.3V PCI

3.3V

CLKBUF_PCI, HCLKBUF_PCI,

INBUF_PCI,

OUTBUF_PCI,

TRIBUF_PCI,

BIBUF_PCI

3.3V PCI-X

3.3V

CLKBUF_PCI-X,

HCLKBUF_PCI-X,

INBUF_PCI-X,

OUTBUF_PCI-X,

TRIBUF_PCI-X,

BIBUF_PCI-X

LVCMOS25

2.5V

CLKBUF_LVCMOS25,

HCLKBUF_LVCMOS25,

INBUF_LVCMOS25,

OUTBUF_LVCMOS25,

TRIBUF_LVCMOS25,

BIBUF_LVCMOS25

LVCMOS18

1.8V

CLKBUF_LVCMOS18,

HCLKBUF_LVCMOS18,

INBUF_LVCMOS18,

OUTBUF_LVCMOS18,

TRIBUF_LVCMOS18,

BIBUF_LVCMOS18

LVCMOS15 (JESD8-11)

1.5V

CLKBUF_LVCMOS15,

HCLKBUF_LVCMOS15,

INBUF_LVCMOS15,

OUTBUF_LVCMOS15,

TRIBUF_LVCMOS15,

BIBUF_LVCMOS15

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