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Ethernet Subsystem Registers
14.5.8.9 TX_START_WDS Register (offset = 20h) [reset = 20h]
TX_START_WDS is shown in Figure 14-192 and described in Table 14-209.
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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