AX88180 Datasheet, PDF (6/47 Pages) ASIX Electronics Corporation – High-Performance Non-PCI 32-bit 10/100/1000M Gigabit Ethernet Controller

AX88180
1.0 Introduction
1.1 General Description
The AX88180, SRAM-like 16/32-bit local bus to Gigabit Ethernet bridge, supports a 10/100/1000 Mbps with RGMII
(V2.0 in delay timing) or MII in wire-speed operation. AX88180 supports RGMII (802.3ab, 1000Base-T) interface with
full-duplex operation at gigabit speed and full-duplex or half-duplex operation at 10/100 Mbps speed. AX88180 can also
operate in MII mode with 10/100Mbps speed.
The AX88180 has two built-in synchronous SRAM for buffering packet. The one is 32K bytes for receiving packets
from Ethernet PHY; the other is 8K-bytes for transmitting packets from host system to Ethernet PHY. The AX88180 also
has 256 bytes built-in configuration registers. For software programming, the total address space used in AX88180 is 64K
in 32-bit mode and at least (8K + 8) bytes in 16-bit mode.
Because AX88180 is a SRAM-like device, AX88180 could be treated as a SRAM device and can be attached to SRAM
controller of system. Therefore, system can execute DMA cycles to gain the highest performance.
AX88180 needs 2 clock sources. One (HCLK) is the same to host system clock or from stand-along OSC, the other is
125Mhz (CLK125) for AX88180 running in RGMII mode. In general application, the 125MHz clock can be from Giga
-PHY for cost effectively.
1.2 AX88180 Block Diagram
Figure 1 : AX88180 block diagram
6
ASIX ELECTRONICS CORPORATION