APEX20KC datasheet(43/90 Pages) ALTERA

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Altera Corporation

APEX 20KC Programmable Logic Device Data Sheet

Advanced I/O Standard Support

APEX 20KC IOEs support the following I/O standards: LVTTL,

LVCMOS, 1.8-V I/O, 2.5-V I/O, 3.3-V PCI, PCI-X, 3.3-V AGP, LVDS,

LVPECL, GTL+, CTT, HSTL Class I, SSTL-3 Class I and II, and SSTL-2

Class I and II.

f For more information on I/O standards supported by APEX 20KC

devices, see Application Note 117 (Using Selectable I/O Standards in Altera

Devices).

The APEX 20KC device contains eight I/O banks. In QFP packages, the

banks are linked to form four I/O banks. The I/O banks directly support

all standards except LVDS and LVPECL. All I/O banks can support LVDS

and LVPECL at up to 156 Mbps per channel with the addition of external

resistors. In addition, one block within a bank contains circuitry to

support high-speed True-LVDS and LVPECL inputs, and another block

within a bank supports high-speed True-LVDS and LVPECL outputs. The

LVDS blocks support all of the I/O standards. Each I/O bank has its own

VCCIO

pins. A single device can support 1.8-V, 2.5-V, and 3.3-V interfaces;

each bank can support a different standard independently. Each bank can

also use a separate VREF level so that each bank can support any of the

terminated standards (such as SSTL-3) independently. Within a bank, any

one of the terminated standards can be supported. EP20K400C and larger

APEX 20KC devices support the LVDS interface for data pins (EP20K200C

devices support LVDS clock pins, but not data pins). EP20K400C and

EP20K600C devices support LVDS for data pins at up to 840 Mbps per

channel. EP20K1000C devices support LVDS on 16 channels at up to 750

Mbps.

Each bank can support multiple standards with the same VCCIO for

output pins. Each bank can support one voltage-referenced I/O standard,

but it can support multiple I/O standards with the same VCCIO voltage

level. For example, when VCCIO is 3.3 V, a bank can support LVTTL,

LVCMOS, 3.3-V PCI, and SSTL-3 for inputs and outputs.

When the LVDS banks are not used for the LVDS I/O standard, they

support all of the other I/O standards. Figure 28 shows the arrangement

of the APEX 20KC I/O banks.

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