File Transfer Complete; Pause Control Frame; Figure 61: File Transfer Scenario: File Transfer Complete; Figure 62: Pause Control Frame - Broadcom NetXtreme/NetLink BCM5718 Series Programmer's Manual

BCM5718 Programmer's Guide

File Transfer Complete

The Client has caught up with the transmission flow of the Server (see
memory is below the flow control threshold. The file is transfer is complete. This scenario was a worst-case
cascade, where the pause delay propagated through the LAN. The Switch could absorb the Client's pause
delay, without having to flow control the Server.

Pause Control Frame

The minimum size frame is 512 bits or 64 bytes (see
unused portion of the payload. A flow control frame contains the following fields:
• Destination address field, set to 01-80-C2-00-00-01
• Source address field set to unique MAC address of sender
• LL/Type field set to the 802_3_MAC_CONTROL value, set to 88–08
• MAC control pause opcode (00-01), pause_time, and reserved field (zeros)
64 bytes - 20 bytes -
mac_ctrl_parm_len
Broadcom
®
January 29, 2016 • 5718-PG108-R

Figure 61: File Transfer Scenario: File Transfer Complete

Gigabit Server

Figure 62: Pause Control Frame

Destination address
Source address
LL/Type
MAC control opcode
MAC control parameters
Reserved field
Figure
Switch
Figure 62). MAC control frames must pad zeros into the
Pause Frame
01 80 C2 00 00 01
6 bytes
XX XX XX XX XX XX
6 bytes
88 08
2 bytes
00 01
2 bytes
00 10
2 bytes
42 bytes
00 00 00 ...
Pause Control Frame
61). The Client's RX buffers/
File
Gigabit Client
Multicast address
Source address
Pause frame opcode
Pause frame opcode
Delay 10 Quanta (Slot times)
Page 578