參數(shù)資料
型號(hào)： LXT9880AGE
英文描述： Controller Miscellaneous - Datasheet Reference
中文描述： 控制器雜項(xiàng)-數(shù)據(jù)表參考
文件頁數(shù)： 44/96頁
文件大?。?/td> 1309K
代理商： LXT9880AGE
LXT980/980A Dual-Speed, 5-Port Fast Ethernet Repeater
44
Datasheet
2.6.5
Address Arbitration
Each device has a two part address, consisting of a HubID and a ChipID. The ChipID is assigned
by the input pins CHIPID<2:0>. The manager assigns the HubID, and each LXT980 within a
particular box will have the same HubID. The Hub ID is assigned through one of two arbitration
mechanisms as shown in
Figure 12
.
2.6.5.1
EEPROM Arbitration Mechanism
This mechanism requires one serial EEPROM with a unique 48-bit ID on each board. This ID can
consist of serial number, date/week/year of manufacture, etc. The ARBSELECT pin must be pulled
Low. At power-up, the device with ChipID = 0 reads a 48-bit ID from the PROM. All other devices
on the board listen in and record this ID. The device with ChipID = 0 then transmits Arbitration
Request messages on the Serial Management Interface (SMI) every 2-3 ms. The request messages
from the two boards may collide. If this happens, a resolution scheme ensures that only one
message will be transmitted.
Table 22. Typical Serial Management Packets
Message
Contents of Fields in Serial Management Packet
Hub ID
Chip ID
Command
Length
Address
Data
Write
1, 2
User defined
User defined
18 Hex
01 or 02 Hex
User defined
User defined
Read Request
1, 3
User defined
User defined
04 Hex
01 to 7F Hex
User defined
Null
Read Response
3
00000
000
04 Hex
01 to 7F Hex
User defined
Data values
Assign Hub ID
(Arb Method 1)
11111
111
18 Hex
02 Hex
188 Hex
Formatted per
Table 76 on
page 91
Assign Hub ID
(Arb Method 2)
11111
111
14 Hex
01 Hex
000 Hex
Hub ID (LSB)
and 27 0s0s
Set Arbout to 0
User defined
User defined
1C Hex
00 Hex
000 Hex
Null
Set Arbout to 1
User defined
User defined
0C Hex
00 Hex
000 Hex
Null
Arb Request
00000
000
08 Hex
02 Hex
190 Hex
PROM ID
Resend Arbitration
11111
111
10 Hex
00 Hex
000 Hex
Null
Resend Arbitration
Response
00000
000
08 Hex
02 Hex
190 Hex
EEPROM ID
Device type/
Revision code
User defined
User defined
02 Hex
01 Hex
000 Hex
Null
Device/Revision
Response
00000
000
02 Hex
01 Hex
0AD Hex
Device type/
revision
1. Other than checking that the top 3 bits of the address equals 000, the LXT980 does not check if the user writes or reads past
the highest location in the data sheet. There are no adverse effects for writing or reading locations above the specified range.
2. If the user performs a write operation of length 1 or 2 and does not send a data field, the LXT980 will write junk into the
specified registers. This constitutes an invalid command.
3. If the user reads past the highest location of the LXT980, all those locations will read back 0s. If a read operation is performed
with a length of 0, the LXT980 will not respond.
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