RELEASED
DATA SHEET
PMC-2010333
ISSUE 3
PM7382 FREEDM-32P256
FRAME ENGINE AND DATA LINK MANAGER 32P256
Transmit Descriptor Table can contain a maximum of 32768 TDs. The base of
the Transmit Descriptor Table is user programmable using the TMAC Tx
Descriptor Table Base register. Thus, as shown below, each TD can be located
using a Transmit Descriptor Reference (TDR) combined with the TMAC Tx
Descriptor Table Base register.
Figure 12 – Transmit Descriptor Table
TDTB[31:4] = Tx Descriptor Table Base register
TDR[14:0] = Transmit Descriptor Reference
TD_ADDR[31:0] = Transmit Descriptor Address
Bit 31
TDTB[31:4]
Bit 0
0000
+
TDR[14:0]
0000
=
TD_ADDR[31:0]
TDTB
TD1
TD_ADDR
TD2
Bit 31
Bit 0
Dword 0
Dword 1
Dword 2
Dword 3
Dword 0
Dword 3
Dword 0
TD 32768
Dword 3
PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA,INC., AND FOR ITS CUSTOMERS’ INTERNAL USE
66
PMC [ PMC-SIERRA, INC ]
