參數(shù)資料
型號: L64381
廠商: LSI Corporation
英文描述: 4-Port Ethernet Controller(四端口以太網(wǎng)控制器)
中文描述: 4端口以太網(wǎng)控制器(四端口以太網(wǎng)控制器)
文件頁數(shù): 22/109頁
文件大小: 815K
代理商: L64381
2-6
Registers
THRESH
Transmit Threshold
These two bits determine the number of words that need
to be stored in the Transmit FIFO before it initiates a packet
transmit on the Ethernet.
[8:7]
BUS
Bus Transfer Size
These bits specify the maximum number of words that
the L64381 transfers across the Bus Interface whenever
the L64381 asserts either PKT_AVAIL or BUF_AVAIL in
response to the assertion of STROBE.
[6:5]
Note:
that to externally control the length of the trans-
fer, the system could deassert either
READ_OUT_PKT or WRITE_IN_PKT before the
BUS amount of words is transferred across the
Bus Interface. However, READ_OUT_PKT or
WRITE_IN_PKT should not be kept asserted
after the BUS amount of words has been trans-
ferred, because the L64381 does not guarantee
the response. If an EOP signal is asserted in the
middle of a transfer, the L64381 drives idle data
(zeros) until it detects the deassertion of
READ_OUT_PKT. If the L64381 detects an EOP
while WRITE_IN_PKT is asserted, then it stops
writing data into the Transmit FIFO after that
cycle.
TT
# of Stored Words
00
01
10
11
4 words
8 words
16 words
16 words
BUS
Transfer Size
00
01
10
11
4 words
8 words
16 words
16 words
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