Ethernet Subsystem Registers
14.5.1.5 TBLCTL Register (offset = 20h) [reset = 0h]
TBLCTL is shown in
and described in
ADDRESS LOOKUP ENGINE TABLE CONTROL
Figure 14-19. TBLCTL Register
31
30
29
28
27
26
25
24
WRITE_RDZ
Reserved
R/W-0
23
22
21
20
19
18
17
16
Reserved
15
14
13
12
11
10
9
8
Reserved
ENTRY_POINTER
R/W-0
7
6
5
4
3
2
1
0
ENTRY_POINTER
R/W-0
LEGEND: R/W = Read/Write; R = Read only; W1toCl = Write 1 to clear bit; -n = value after reset
Table 14-29. TBLCTL Register Field Descriptions
Bit
Field
Type
Reset
Description
31
WRITE_RDZ
R/W-0
0
Write Bit - This bit is always read as zero.
Writing a 1 to this bit causes the three table word register values to
be written to the entry_pointer location in the address table.
Writing a 0 to this bit causes the three table word register values to
be loaded from the entry_pointer location in the address table so that
they may be subsequently read.
A read of any ALE address location will be stalled until the read or
write has completed.
9-0
ENTRY_POINTER
R/W-0
0
Table Entry Pointer - The entry_pointer contains the table entry
value that will be read/written with accesses to the table word
registers.
1246
Ethernet Subsystem
SPRUH73H – October 2011 – Revised April 2013
Copyright © 2011–2013, Texas Instruments Incorporated