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)： 16/96頁
文件大小： 1309K
代理商： LXT9880AGE
LXT980/980A Dual-Speed, 5-Port Fast Ethernet Repeater
16
Datasheet
60
STX
TTL Output
OD
Serial Transmit.
Transmit data output for high-speed serial management interface.
Must be tied to SRX externally. Data transmitted on STX is compared with data
received on SRX. In the event of a mismatch, STX is put in the high impedance
state. STX is driven on the falling edge of SERCLK.
61
SERCLK
Tri-state TTL
I/O, PD
Serial Clock.
Clock for serial management interface. Depending on RECONFIG,
this pin is either a 625 kHz output or a 0 to 2 MHz input.
198
ARBIN
TTL Input, PD,
NC
Arbitration In/Out
. Used with Chain Arbitration. If used, tie ARBIN to ARBOUT of
the previous device. ARBIN at the top of the daisy chain can be connected to
ground or to ARBOUT of the SCC. If unused, tie ARBIN High.
64
ARBOUT
TTL Output
NC
65
ARBSELECT
TTL Input
PU
Arbitration Mode Select.
0 = EEPROM based, 1 = chain based.
66
MGR_PRES
TTL Input
NC, PU
Manager Present.
This signal is sensed at power up and hardware reset. If the
signal is High, it indicates that no local manager is present, and the LXT980
enables all ports and sets all LEDs to operate in
“
hardware mode
”
. If it is Low,
indicating that a manager is present, the LXT980 disables all ports, pending control
of network manager.
Table 8. LED Signal Descriptions
Pin
Symbol
Type
1
Description
208
207
LEDSEL0
LEDSEL1
TTL Input
PD
LED Mode Select
. Must be static.
00 = Mode 1, 01 = Mode 2, 10 = Mode 3
181
177
173
166
162
PORT1_LED1
PORT2_LED1
PORT3_LED1
PORT4_LED1
PORT5_LED1
TTL
Output
LED Driver 1 - Ports 1 through 5.
Programmable LED driver.
Active Low. See
“
Port LEDs
”
on page 32
.
180
176
172
165
161
PORT1_LED2
PORT2_LED2
PORT3_LED2
PORT4_LED2
PORT5_LED2
TTL
Output
LED Driver 2 - Ports 1 through 5.
Programmable LED driver.
Active Low. See
“
Port LEDs
”
on page 32
.
179
175
171
164
160
PORT1_LED3
PORT2_LED3
PORT3_LED3
PORT4_LED3
PORT5_LED3
TTL
Output
LED Driver 3 - Ports 1 through 5.
Programmable LED driver.
Active Low. See
“
Port LEDs
”
on page 32
.
85
COL10_LED
TTL
Output
10 Mbps Collision LED Driver.
Active Low indicates collision on 10Mbps segment.
1. PD = Input contains pull-down.
TTL = Transistor-Transistor Logic
Table 7. Serial Management Interface Signal Descriptions (Continued)
Pin
Symbol
Type
1
Description
1. NC = No Clamp. Pad will not clamp input in the absence of power.
PU = Input contains pull-up.
PD = Input contains pull-down
OD = Open Drain
TTL = Transistor-Transistor Logic.
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