STE100A View Datasheet(PDF) - STMicroelectronics

Part Name

Description

MFG CO.

STE100A

PCI 10/100 Ethernet controller with integrated PHY (3.3V)

STMicroelectronics 

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Functional description

STE10/100A

Receive operation for PAUSE function

Upon reception of a valid MAC Control frame, the STE10/100A will start a timer for the

length of time specified by the MAC control parameters field. When the timer value reaches

zero, the STE10/100A exits the PAUSE state. However, a PAUSE frame will not affect the

transmission of a frame that has been submitted to the MAC (i.e., once a transmit out of the

MAC is begun, it can’t be interrupted). Conversely, the STE10/100A will not begin to transmit

a frame more than one slot-time after valid PAUSE frame is received a with a non-zero

PAUSE time. If the STE10/100A receives a PAUSE frame with a zero PAUSE time value, the

STE10/100A exits the PAUSE state immediately.

Figure 15. Pause operation receive state diagram

Opcode = PAUSE function

Wait for transmission completed

Transmission_in_progress = false *

DA = (01-80-C2-00-00-01 + Phys-address)

DA ≠ (01-80-C2-00-00-01 + Phys-address)

PAUSE function

n_slots_rx = data [17:32]

Start pause_timer (n_slots_rx * slot_time)

UCT

END PAUSE

PC00359

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