16-bit High-Performance Single-Chip 10/100 Ethernet Controller with HP Auto-MDIX
Datasheet
1.11
Host Bus Interface (SRAM Interface)
The host bus interface provides a FIFO interface for the transmit and receive data paths, as well as
an interface for the LAN9217 Control and Status Registers (CSR’s).
The host bus interface is the primary bus for connection to the embedded host system. This interface
models an asynchronous SRAM. TX FIFO, RX FIFO, and CSR’s are accessed through this interface.
Programmed I/O transactions are supported.
The LAN9217 host bus interface supports 16-bit bus transfers. Internally, all data paths are 32-bits
wide. The LAN9217 can be interfaced to either Big-Endian or Little-Endian processors.
1.12
External MII Interface
The LAN9217 also supports the ability to interface to an external PHY device. This interface is
compatible with all IEEE 802.3 MII compliant physical layer devices. For additional information on the
MII interface and associated signals, please refer to Section 3.11, "MII Interface - External MII
Switching," on page 41 for more information.
SMSC LAN9217
13
Revision 1.8 (06-06-07)
DATASHEET
SMSC [ SMSC CORPORATION ]
