Ethernet Subsystem Registers
14.5.8.9 TX_START_WDS Register (offset = 20h) [reset = 20h]
TX_START_WDS is shown in
and described in
TRANSMIT START WORDS
Figure 14-192. TX_START_WDS Register
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
Reserved
TX_START_WDS
R/W-0
LEGEND: R/W = Read/Write; R = Read only; W1toCl = Write 1 to clear bit; -n = value after reset
Table 14-209. TX_START_WDS Register Field Descriptions
Bit
Field
Type
Reset
Description
10-0
TX_START_WDS
R/W-0
0
FIFO Packet Transmit (egress) Start Words.
This value is the number of required packet words in the transmit
FIFO before the packet egress will begin.
This value is non-zero to preclude underrun.
Decimal 32 is the recommended value.
It should not be increased unnecessairly to prevent adding to the
switch latency.
1433
SPRUH73H – October 2011 – Revised April 2013
Ethernet Subsystem
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