10/100 Non-PCI Ethernet Single Chip MAC + PHY

Datasheet

Chapter 6 Signal Description Parameters

 

This section provides a detailed description of each SMSC LAN91C111 signal. The signals are

 

arranged in functional groups according to their associated function.

 

The ‘n’ symbol at the beginning of a signal name indicates that it is an active low signal. When ‘n’ is

 

not present before the signal name, it indicates an active high signal.

 

The term “assert” or “assertion” indicates that a signal is active; independent of whether that level is

 

represented by a high or low voltage. The term negates or negation indicates that a signal is inactive.

 

The term High-Z means tri-stated.

 

The term Undefined means the signal could be high, low, tri-stated, or in some in-between level.

6.1

Buffer Types

 

 

 

O4

 

Output buffer with 2mA source and 4mA sink

 

 

 

O12

 

Output buffer with 6mA source and 12mA sink

 

 

 

O16

 

Output buffer with 8mA source and 16mA sink

 

 

 

O24

 

Output buffer with 12mA source and 24mA sink

 

 

 

OD16

 

Open drain buffer with 16mA sink

 

 

 

OD24

 

Open drain buffer with 24mA sink

 

 

 

I/O4

 

Bidirectional buffer with 2mA source and 4mA sink

 

 

 

I/O24

 

Bidirectional buffer with 12mA source and 24mA sink

 

 

 

I/OD

 

Bidirectional Open drain buffer with 4mA sink

 

 

 

I

 

Input buffer

 

 

 

IS

 

Input buffer with Schmitt Trigger Hysteresis

 

 

 

Iclk

 

Clock input buffer

 

 

 

I/O

 

Differential Input

 

 

 

O/I

 

Differential Output

 

 

 

**

 

5V tolerant. Input pins are able to accept 5V signals

 

 

 

 

DC levels and conditions defined in the DC Electrical Characteristics section.

SMSC LAN91C111 REV C

19

Revision 1.91 (08-18-08)

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