Chapter 6: Using Flow Control; Overview Of Flow Control; Flow Control Requirement; Figure 6-1: Requirement For Flow Control - Xilinx LogiCORE IP MAC v8.5 User Manual

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Using Flow Control
This chapter describes the operation of the flow-control logic of the GEMAC core. The flow
control block is designed to clause 31 of the IEEE 802.3-2005 standard. The MAC may be
configured to transmit pause requests and to act on their reception; these modes of
operation can be independently enabled or disabled. See
on page

Overview of Flow Control

Flow Control Requirement

Figure 6-1
1-Gigabit Ethernet MAC v8.5 User Guide
UG144 April 24, 2009
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81.
illustrates the requirements for Flow Control.
User System
Client Logic
FIFO

Figure 6-1: Requirement for Flow Control

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User MAC
125MHz -100ppm
Tx
Rx
125MHz +100ppm
Chapter 6
"Flow Control Configuration,"
Link Partner MAC
Rx
Tx
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