PM7384 FREEDM-84P672
DATA SHEET
PMC-1990445
ISSUE 5
FRAME ENGINE AND DATA LINK MANAGER 84P672
Figure 14 – TD Linking
TD
TD
P4
TD
P1
P3
Curr. Next Last Host
TDR TDR TDR TDR
TMAC Link
V=1
V=1
V=0
TMAC Link
M=1
M=1
M=0
CE=0
CE=0
CE=1
TCDR Table
Data
Data
Host Link
Host Link
TD
TD
P3
P1
M=1
CE=0
M=0
CE=1
Data
Data
Data
Data
Host Link
TD
P1
M=0
CE=0
Host Link
TD
P2
M=0
CE=1
The host links the TDs vertically while the TMAC672 links TDs horizontally.
Figure 14 shows the TDs for packets P1 and P2 linked by the host before the
TDR is placed on the TDRR queue, as are the TDs for packet P3 and P4.
Packet P3 is linked to packet P1 by the TMAC672, as is packet P4 linked to
PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA, INC., AND FOR ITS CUSTOMERS’ INTERNAL USE
71
PMC [ PMC-SIERRA, INC ]
