MCP2155_13 datasheet(10/52 Pages) MICROCHIP

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MCP2155

DS21690B-page 10

Preliminary

 2001-2013 Microchip Technology Inc.

2.8

Minimizing Power

The device can be placed in a low power mode by dis-

abling the device (holding the EN pin at the low state).

The internal state machine is monitoring this pin for a

low level, and once this is detected the device is dis-

abled and enters into a low power state.

2.8.1

RETURNING TO DEVICE

OPERATION

When disabled, the device is in a low power state.

When the EN pin is brought to a high level, the device

will return to the operating mode. The device requires

a delay of 1024 TOSC before data may be transmitted

or received.

2.9

Network Layering Reference

Model

Figure 2-5 shows the ISO Network Layering Reference

Model. The shaded areas are implemented by the

MCP2155, the cross-hatched area is implemented by

an infrared transceiver, and the unshaded areas need

to be implemented by the Host controller.

FIGURE 2-5:

ISO REFERENCE LAYER MODEL

OSI REFERENCE LAYERS

Application

Presentation

Session

Transport

Network

Data Link Layer

LLC (Logical Link Control)

Acceptance Filtering

Overload Notification

Recovery Management

MAC (Medium Access Control)

Data Encapsulation/Decapsulation

Frame Coding (stuffing, destuffing)

Medium Access Management

Error Detection

Error Signaling

Acknowledgment

Serialization/Deserialization

Physical Layer

PLS (Physical Signalling)

Bit Encoding/Decoding

Bit Timing

Synchronization

PMA (Physical Medium Attachment)

Driver/Receiver Characteristics

MDI (Medium Dependent Interface)

Connectors

Fault

confinement

(MAC-LME)

Bus Failure

management

(PLS-LME)

Supervisor

Regions implemented

by the MCP2155

Has to be implemented in Host

Controller firmware

Regions implemented

by the Optical Transceiver logic

(such as a PIC®

microcontroller)

21690B.book Page 10 Thursday, January 10, 2013 1:06 PM

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