參數(shù)資料
型號(hào): 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): 49/109頁
文件大?。?/td> 815K
代理商: L64381
Bus Interface Signals
3-9
has space equal to or more than the number of words
specified in the Bus Transfer Size field (BUS) in the
L64381 Configuration Register 1. This signal is valid on
the four cycles following the assertion of STROBE. The
state of this signal on the four cycles following the asser-
tion of STROBE indicates the Transmit FIFO space avail-
ability for Ports [3:0], respectively. If at the time of
assertion of STROBE, a bus transfer is occurring, then
BUF_AVAIL is not asserted for that particular port but it
does indicate correct status for the other ports.
BYTE_VALID[3:0]
Valid Bytes
These pins indicate which bytes are valid in the current
word. Byte 0 refers to DATA[7:0], Byte 1 refers to
DATA[15:8], Byte 2 refers to DATA[23:16], and Byte 3
refers to DATA[31:24]. The following table shows the valid
combinations of BYTE_VALID[3:0].
Bidirectional
Note:
The bytes transferred with SOP or EOP can
have any of the above combinations except for
BYTE_VALID[3:0] = 1111
2
. Bytes transferred
between SOP and EOP can have only
BYTE_VALID[3:0] = 0000
2
. All other combina-
tions not listed above are invalid.
While writing a packet from the bus, the L64381 accepts
any of the seven valid BYTE_VALID[3:0] combinations:
0000
2
, 1000
2
, 1100
2
, 1110
2
, 0001
2
, 0011
2
, or 0111
2
.
However, for receiving PKT with SOP asserted, the
L64381 always asserts BYTE_VALID[3:0] as 0000
2
. For
PKT receiving with EOP asserted, the L64381 asserts
the BYTE_VALID[3:0] as one of four combinations:
BYTE_VALID[3:0]
DATA[31:0]
0000
1000
1100
1110
0001
0011
0111
All Bytes Valid
Bytes 2, 1, and 0 Valid
Bytes 1 and 0 Valid
Byte 0 Valid
Bytes 3, 2, and 1 Valid
Bytes 3, 2 Valid
Byte 3 Valid
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