CS89712-CB View Datasheet(PDF) - Cirrus Logic

Part Name

Description

MFG CO.

CS89712-CB

High-Performance, Low-Power System-on-Chip with 10BASE-T Ethernet Controller

Cirrus Logic 

Start Monitoring

Network Activity

Yes Network

Active?

No

Start IPG

Timer

Wait

3.2 µ s

Yes

IPG

Timer =

6.4 µs?

No

Network No

Active?

Yes

Tx

Frame No

Ready and Not

in Backoff?

No

Network Yes

Active?

Yes

Transmit

Frame

Figure 14. Two-Part Deferral

CS89712

Start Monitoring

Network Activity

Yes Network

Active?

No

Wait

9.6 µ s

Tx

Frame

No

Ready and Not

in Backoff?

No

Network Yes

Active?

Yes

Transmit

Frame

Figure 15. Simple Deferral

frame is pending and if the MAC is not in Backoff,

transmission begins the 9.6 µs IPG). If no transmit

packet is pending, the MAC continues to monitor

the network. If activity is detected before a transmit

frame is ready, the MAC defers to the transmitting

station and resumes monitoring the network. Fig-

ure 15 diagrams the simple deferral process.

2.26.5.4 Collision Resolution

If a collision is detected while the Ethernet port is

transmitting, the MAC responds in one of three

ways depending on whether it is a normal collision

(within the first 512 bits of transmission) or a late

collision (after the first 512 bits of transmission):

50

DS502PP2

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