Figure 73: File Transfer Scenario: File Transfer Complete; Figure 74: Pause Control Frame - Broadcom BCM5722 Programmer's Manual

BCM5722
F T C
ILE RANSFER OMPLETE
The Client has caught up with the transmission flow of the Server (see
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.
P C
AUSE ONTROL
The minimum size frame is 512 bits or 64 bytes (see
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
Page 517 Pause Control Frame
Gigabit Server

Figure 73: File Transfer Scenario: File Transfer Complete

F
RAME
Figure
Pause Frame
Destination address
Source address
LL/Type
MAC control opcode
MAC control parameters
Reserved field

Figure 74: Pause Control Frame

Bro adco m C orp or atio n
Figure 73). The Client's RX buffers/memory is below
Switch
74). MAC control frames must pad zeros into the unused portion
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 ...
Programmer's Guide
File
Gigabit Client
Multicast address
Source address
Pause frame opcode
Pause frame opcode
Delay 10 Quanta (Slot times)
Document 5722-PG101-R
10/15/07