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数据搜索系统，热门电子元器件搜索 |
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数据搜索系统，热门电子元器件搜索 |
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DP83821 数据表(PDF) 7 Page - National Semiconductor (TI) |
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DP83821 数据表(HTML) 7 Page - National Semiconductor (TI) |
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7 / 86 page  7 www.national.com 2.0 Pin Descriptions (Continued) Clock Interface Symbol Pin No(s) Direction Description X1 122 I Crystal/Oscillator Input: This pin is the primary clock reference input for the DP83821 IC and must be connected to a 25MHz 0.005% (50ppm) clock source. The DP83821 device supports either an external crystal resonator connected across pins X1 and X2, or an external CMOS-level oscillator source connected to pin X1 only. X2 121 O Crystal Output: This pin is used in conjunction with the X1 pin to connect to an external 25MHz crystal resonator device. This pin must be left unconnected if an external CMOS oscillator clock source is utilized. For more information see the definition for pin X1. Phy And General Purpose Interface Symbol Pin No(s) Direction Description GP1DUP 131 I/O General Purpose Pin 1 or Duplex Status: By default, this pin can be used to input the Full Duplex status from an external Phy. The pin can also be programmed as a general purpose I/O. This pin pad has an internal weak pull up. GP2 127 I/O General Purpose Pin 2: This pin is a general purpose I/O pin that can be programmed as an input or output. This pin has an internal weak pull up. GP3 128 I/O General Purpose Pin 3: This pin is a general purpose I/O pin that can be programmed as an input or output. This pin has an internal weak pull up. GP4 129 I/O General Purpose Pin 4: This pin is a general purpose I/O pin that can be programmed as an input or output. This pin has an internal weak pull up. GP5 130 I/O General Purpose Pin 5: This pin is a general purpose I/O pin that can be programmed as an input or output. This pin has an internal weak pull up. PHYLNK 132 I Phy Link Status: This can be used to input the Phy Link Status. This allows the value to be read back from the MAC register space. SPD100 133 I 100 Mb/s Speed Status: This can be used to input the 100 Mb/s Speed Status from an external phy. This is used along with the SPD1000 bit to determine current speed status of the Phy. SPD1000 134 I 1000 Mb/s Speed Status: This can be used to input the 1000 Mb/s Speed Status from an external phy. This is used along with the SPD100 bit to determine current speed status of the Phy. PHYRSTN 172 O Phy Reset: This pin can be used to reset an External Phy. Serial EEPROM Interface Symbol Pin No(s) Direction Description EESEL 91 O EEPROM Chip Select: This signal is used to enable the external EEPROM device. MA4/EECLK 109 O EEPROM Clock: During an EEPROM access (EESEL asserted), this pin is an output used to drive the serial clock to an external EEPROM device. |
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