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DM9095 Datenblatt(PDF) 11 Page - List of Unclassifed Manufacturers |
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DM9095 Datenblatt(HTML) 11 Page - List of Unclassifed Manufacturers |
11 / 21 page DM9095 Twisted-Pair Medium Attachment Unit 11 Final Version: DM9095-DS-F02 August 21, 2000 Crystal Oscillator An external TTL-Level clock can be applied to the OSC1 pin which is crystal oscillator input. A resistor should be added in series with the clock source to limit the amplitude of the voltage swing seen by the pin. A 500 resistor works well in most cases. LED Status Functions The LED drivers require an external resistor in series with the LED, which is in turn connected to VDD. The driver pulls the pin low to light the LED and can sink up to 15mA of drive current from the resistor with an output impedance of less than 50 . The DM9095 provides three types LED drivers, as follows. Output LED Drivers: The LED outputs XLED, RLED, JLED, and CLED are output LED drivers. These signals are used for status information only. XLED drives high when the DM9095 is transmitting a packet. XLED is not asserted if the DM9095 has detected a jabber function or is in a link-fail state. RLED drives high when the DM9095 is receiving a packet. RLED is not asserted when the DM9095 is in a link-fail state. JLED drives low when the DM9095 has detected a jabber condition. CLED drives low when the DM9095 has detected a collision condition. Sampled LED Driver: The AP pin is used to set the configuration of the DM9095 and drive the LED status indicators. Every 26ms, the pin is configured as an input pin for 6.5• s. During this time, it is sampled by the DM9095. Outside the sampling window, the driver is placed in an output state and used to drive the LED indicators. AP is driven low to indicate that a reversed twisted pair has been detected on the receive circuit and corrected. If AP is tied low, DM9095 disables the auto-polarity function; when AP is pulled high externally, the function is enabled. Input / Output LED Driver: LI-pin is an input/output pin, depending on the mode selection. When configured as an input pin, LI-controls the link integrity test option. If LI- is connected to GND, the link integrity function is enabled. If LI- is connected to VDD or left floating (internal pull-high), the link integrity function is disabled. When configured as an output pin, the pin drives low for link-fail state and drives high for link-pass state. The output pin can drive an LED status indicator. Power There are six power connections to the DM9095, including three VDD and three GND connections. Pins 1 and 28 are used for analog supplies, including squelch circuits, receiver, and the internal delay circuit. Pins 10 and 14 are used for digital circuits, the I/O buffer, the control logic for analog circuits, and the crystal oscillator circuit. Pins 18 and 23 are used for the Twisted Pair driver output buffer. Operating Modes The mode selection pins are used to select one of eight operating modes. These modes are summarized in the table below. The modes referred to in the table are the following: z Heartbeat: A Yest means that the heartbeat function is enabled; A No means the heartbeat function is disabled. z Line Length: “Extended” indicates that TP receive squelch thresholds have been lowered to 300mV for use with longer line lengths; Normal indicates that the standard 10BASE-T TP receive squelch threshold of 450mV will be used. z LI-: The LI- pin can be configured to be an input pin, whereby the link-integrity function can be enabled or disabled. The LI- pin can also be configured as an output pin to indicate the status of the link, where the link-integrity is enabled. Mode Description Mode MD0 MD1 MD2 Heartbeat Line Length LI- Application 0000 No Extended I Long wire TP 1001 No Normal I Normal wire TP 2010 No Normal O LI pin LED output 3011 Poer-down mode 4100 Yes Extended I Long wire TP 5101 Yes Normal I Normal wire TP 6110 Yes Normal O LI pin LED output 7111 Power-down mode |
Ähnliche Teilenummer - DM9095 |
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Ähnliche Beschreibung - DM9095 |
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