參數(shù)資料
型號(hào)： LXT9883HC
英文描述： LAN HUB CONTROLLER
中文描述： 局域網(wǎng)集線器控制器
文件頁(yè)數(shù)： 42/96頁(yè)
文件大小： 1309K
代理商： LXT9883HC
LXT980/980A Dual-Speed, 5-Port Fast Ethernet Repeater
42
Datasheet
Note:
The LXT980 uses the CCITT method of CRC (X16 + X12 + X5 +1).
2.6.3.2
Auto-Clearing Registers
Two registers, the Interrupt Status Register, see
Table 64 on page 86
and the Search Port Match
Register, see
Table 55 on page 83
, exhibit an
“
Auto Clearing
”
feature.
How Auto Clearing Works
Before executing any write command, the device first reads the most recently accessed register. If
the accessed register was an auto-clearing register and set to Auto-Clear Mode, it will be read and
cleared.
Example:
A read or write command is performed on the Interrupt Status Register. Next, a write
command is performed on Port Status Register. The write command to the Port Status Register
causes an internal read of the Interrupt Status Register. If the Interrupt Status Register was set to
Auto-Clear Mode, it will be read and cleared
—
as a result of the write command to the Port Status
Register. Because the read and clear is internal (and automatic), the user may not be aware that all
data in register 1 is now lost.
Note:
The Auto-Clear behavior of the Interrupt Status Register and the Search Port Match Register is
determined by the auto-clear bit in the Repeater Configuration Register (see
Table 70 on page 90
).
Preserving Auto-Clearing Register Data
To preserve auto-clearing data in either the interrupt status register or the Search Port Match
Register, always follow any read or write command to these registers with a read command to a
register that does not auto clear. In other words, do not leave the read pointer on an auto-clearing
register.
Example:
If you read the interrupt status register (address: 0AE), immediately follow with a
“
dummy
”
read of the port link status register (address: 098). This dummy read moves the pointer,
ensuring that the information in the interrupt status register is not inadvertently lost through auto
clearing. After the
“
dummy
”
read, you are now free to go perform any read or write operation
without fear of losing data in the auto clearing registers.
Note:
There is nothing inherently special about using one particular register for the
“
dummy
”
read
instead of another. Using the port link status register (in the preceding example) is only a
suggestion; a read command to any other register that is not auto-clearing is also acceptable.
Table 19. Serial Management Interface Message Fields
Message
Description
Start or Stop Flag
“
01111110
”
. Protocol requires zero insertion after any five consecutive
“
1
”
s in the data stream.
Hub ID
Identifies board or sub-system. Assigned by one of two arbitration mechanisms at power-up.
Chip ID
Identifies one of eight LXT980 devices on a board or sub-system. Assigned by 3 external pins on each
device.
Command
Identifies the particular operation being performed (see
Table 21 on page 43
)
Length
Specifies number of registers to be transferred (1 to 127). Maximum is 2 per write, 127 per read.
Address
Specifies address of register or register block to be transferred.
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