PHY-LINK Layer Interface Support

With versatile I/O capabilities and robust intellectual property (IP) cores, APEX^TM II devices support physical link layer interfaces such as UTOPIA IV, POS-PHY Level 4, and Flexbus Level 4.

POS-PHY

The POS-PHY interface defines operations between physical layer devices (such as ATM, POS, and GigE framers) and link layer devices (such as asynchronous transfer mode (ATM), Internet protocol, and GigE forwarding devices). APEX II devices can support POS-PHY standards up to POS-PHY Level 4 (PL4). PL4 is a standard interface for switches and routers between a physical layer (PHY) and a link layer device, for aggregate bandwidths of OC-192 ATM and Packet-over-SONET (POS), as well as 10-Gigabit Ethernet applications. PL4 provides a flexible 10-Gbps system interface that can handle multiple protocols such as Ethernet, POS, and ATM, including a mix of ATM cells and packets simultaneously. Table 1 summarizes the APEX II POS-PHY link layer support.

Table 1. POS-PHY Interface Support
Interface	I/O Standard	Maximum Throughput	Channels	Clock
POS-PHY Level 2	LVTTL	622 Mbps	16	50 MHz
POS-PHY Level 3	LVTTL	2.5 Gbps	8/32	104 MHz
POS-PHY Level 4	LVDS	10 Gbps	32	832 MHz

UTOPIA

APEX II devices support the UTOPIA physical link (PHY-LINK) layer interface using the LVTTL and LVDS I/O standards. APEX II devices feature support for UTOPIA Level 1, Level 2, Level 3, and Level 4 interfaces, summarized in Table 2.

Table 2. APEX II UTOPIA Interface Support
Interface	I/O Standard	Maximum Throughput	Channels	Clock
UTOPIA Level 1	LVTTL	155 Mbps	8	25 MHz
UTOPIA Level 2	LVTTL	622 Mbps	8/16	50 MHz
UTOPIA Level 3	LVTTL	2.5 Gbps	8/16/32	104 MHz
UTOPIA Level 4	LVDS	10 Gbps	32	415 MHz

Flexbus

APEX II devices support AMCC's Flexbus Level 3 and Level 4 interfaces, as summarized in Table 3.

Table 3. Flexbus Support
Interface	I/O Standard	Maximum Throughput	Channels	Clock
Flexbus Level 3	LVTTL	2.5 Mbps	32/64	50/100 MHz
Flexbus Level 4	HSTL Class I	10 Gbps	64	175 MHz

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