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STE10A Datasheet(PDF) 26 Page - STMicroelectronics

Part # STE10A
Description  PCI 10/100 Ethernet controller with integrated PHY (3.3V)
PDF  82 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

STE10A Datasheet(HTML) 26 Page - STMicroelectronics

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Functional description
STE10/100A
26/82
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
n_slots_rx = data [17:32]
Start pause_timer (n_slots_rx * slot_time)
PAUSE function
Transmission_in_progress = false *
DA = (01-80-C2-00-00-01 + Phys-address)
Wait for transmission completed
DA
≠ (01-80-C2-00-00-01 + Phys-address)
Opcode = PAUSE function
END PAUSE
UCT
PC00359



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