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參數(shù)資料
| 型號： | LXT9860HC |
| 英文描述： | Controller Miscellaneous - Datasheet Reference |
| 中文描述： | 控制器雜項-數(shù)據(jù)表參考 |
| 文件頁數(shù)： | 18/96頁 |
| 文件大?。?/td> | 1309K |
| 代理商： | LXT9860HC |
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LXT980/980A Dual-Speed, 5-Port Fast Ethernet Repeater
18
Datasheet
131
RBIAS
Analog
RBIAS.
Used to provide bias current for internal circuitry. The 100
μ
A bias
current is provided through an external 22.1 k
,
1%
resistor to GNDA.
27, 130
GNDA
Analog
Analog Ground.
78
RPS_PRES
TTL Input
PD
Redundant Power Supply Present.
Active High input indicates presence of
redundant power supply. Tie Low if not used.
77
RPS_FAULT
TTL Input
PU
Redundant Power Supply Fault.
Active Low input indicates redundant power
supply fault. The state of this input is reflected in the RPS_LED output (refer to
Table 8 on page 16
). Tie High if not used.
Table 10. PROM Interface Signal Descriptions
Pin
Symbol
Type
1
Description
67
PROM_CLK
Tri-State TTL I/O,
PD
PROM Clock.
1 MHz clock for reading PROM data (ChipID=0).
If a PROM is not used, this pin must be tied Low.
68
PROM_CS
Tri-State
TTL Output
PROM Chip Select.
Selects EPROM. Active High signal driven by chip
with ID of 0.
69
PROM_DTOUT
Tri-State
TTL Output
PROM Data Output.
Selects read instruction for EPROM. Active High
signal driven only by chip with ID of 0.
70
PROM_DTIN
TTL Input, PD
PROM Data Input.
If PROM not used, input tied Low or High.
1. PD = Input contains pull-down.
TTL = Transistor-Transistor Logic.
Table 11. Miscellaneous Signal Descriptions
Pin
Symbol
Type
1
Description
53
RESET
Schmitt CMOS
Input
NC
Reset.
This active Low input causes internal circuits, state machines, and
counters to reset (address tracking registers do not reset). On power-up,
devices should not be brought out of reset until the power supply has stabilized
and reached 4.5V. When there are multiple devices, it is recommended that all
be supplied by a common reset that is driven by an
‘
LS14 or similar device.
54
CLK25
Schmitt CMOS
Input
25 MHz system clock.
Drive with MOS levels.
71
72
73
CHIPID0
CHIPID1
CHIPID2
TTL Input, PD
Chip ID.
These pins assign unique ChipIDs to as many as eight devices on a
single board. One device on each board must be assigned ChipID = 0.
1. NC = No Clamp. Pad will not clamp input in the absence of power.
PD = Input contains pull-down.
TTL = Transistor-Transistor Logic.
Table 9. Power Supply and Indication Signal Descriptions (Continued)
Pin
Symbol
Type
1
Description
1. PU = Input contains pull-up.
PD = Input contains pull-down.
TTL = Transistor-Transistor Logic.
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