LXD9785 PQFP Demo Board with FPGA for
5.0LEDs
5.1Direct Drive LEDs
The LXD9785 PQFP MII Demo Board provides three programmable LED drivers per port (D4 - D28). Each LED can display one of several available status conditions as selected by the LED Configuration Register (Address 20) shown in Table 8.
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Table 8. Direct Drive LED Configuration Settings (Register 20)
| LED Bits |
| Program |
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| Description | ||
LED1 | LED2 | LED3 | Bits | ||
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| 0000 | Indicates 100 Mbps operation. (Default for LED1) | |
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| 0001 | Indicates transmit (Stretched). | |
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| 0010 | Indicates receive (stretched). (Default for LED3) | |
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| 0011 | Indicates collision (Stretched). | |
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| 0100 | Indicates active link (continuous). (Default for LED2) | |
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| 0101 | Indicates | |
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| 0110 | Reserved. | |
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15:12 | 11:8 | 7:4 | 0111 | Indicates transmit or receive activity. | |
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1000 | Test Mode. Turn LED on (continuous). | ||||
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| 1001 | Test Mode. Turn LED off (continuous). | |
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| 1010 | Test Mode. Blink LED fast (continuous). | |
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| 1011 | Test Mode. Blink LED slow (continuous). | |
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| 1100 | Indicates link and receive status combined1 (Stretched)2. | |
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| 1101 | Indicates link and activity status combined1 (Stretched)2. | |
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| 1110 | Indicates duplex and collision status combined3 (Stretched)2. | |
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| 1111 | Reserved. | |
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1.Link status is the primary LED driver. The LED is asserted (solid ON) when the link is up. The secondary LED driver (receive, activity, or isolate) causes the LED to change state (blink).
2.Combined event LED settings are not affected by bit 20.1 (Pulse Stretch). These settings are stretched regardless of the value of 20.1.
3.Duplex status is the primary LED driver. The LED is asserted (solid ON) when the link is
The programmable LEDs (LED_1, LED_2, and LED_3) are set in the default mode and are programmable via the MDIO pin. Register address 20 also provides optional LED pulse stretching up to 100 ms. Register bits 20.3:2 select one of three possible stretch times as shown in Table 9 on page 18.
Development Kit Manual | 17 |
Document #: 249323
Revision #: 003
Rev. Date: January 24, 2002
