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VSC8658 Datasheet(PDF) 28 Page - Microsemi Corporation

Part # VSC8658
Description  Octal 10/100/1000BASE-T PHY and 100BASEFX/1000BASE-X SerDes
PDF  95 Pages
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Manufacturer  MICROSEMI [Microsemi Corporation]
Direct Link  http://www.microsemi.com
Logo MICROSEMI - Microsemi Corporation

VSC8658 Datasheet(HTML) 28 Page - Microsemi Corporation

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Functional Descriptions
VMDS-10242 VSC8658 Datasheet Revision 4.1
20
LED Blink or Pulse-Stretch This behavior is used for activity and collision indication. This can be
uniquely configured for each LED pin. Activity and collision events can occur randomly and intermittently
throughout the link-up period. Blink is a 50% duty cycle oscillation of asserting and de-asserting an LED
pin. Pulse-stretch guarantees that an LED is asserted and de-asserted for a specific period of time when
activity is either present or not present. These rates can also be configured using a register setting.
Rate of LED Blink or Pulse-Stretch This behavior controls the LED blink rate or pulse-stretch length
when blink/pulse-stretch is enabled on an LED pin. The blink rate, which alternates between a high and
low voltage level at a 50% duty cycle, can be set to 2.5 Hz, 5 Hz, 10 Hz, or 20 Hz. For pulse-stretch, the
rate can be set to 50 ms, 100 ms, 200 ms, or 400 ms.
LED Pulsing Enable To provide additional power savings, the LEDs (when asserted) can be pulsed at
5 kHz, 20% duty cycle.
Fiber LED Disable This bit controls whether the LEDs indicate the Fiber and Copper status (default) or
the Copper status only.
4.14.3
Serial LED Mode
Optionally, the VSC8658 device can be configured so that access to all its LED signals is available
through two pins. This option is enabled by setting LED0 on PHY0 to Serial LED mode. When the mode
is enabled on PHY0, the device LED[0] pin becomes the serial data pin and the LED[1] pin becomes the
serial clock pin. All other LED pins can still be configured normally. The Serial LED mode clocks the 96
LED status bits on the rising edge of the serial clock.
The LED behavior settings (in device register 30) can also be used in Serial LED Mode. The controls are
used on a per-PHY basis, where the LED combine and LED blink or pulse-stretch setting of LED0_n for
each PHY is used to control the behavior of each bit of the serial LED stream for each corresponding
PHY.
The serial bitstream outputs, 1 through 96, of each LED signal are shown in the following table beginning
with PHY port 0 and ending with PHY port 7. The individual signals can be clocked in the order shown.
Table 6 •
LED Serial Stream Order
PHY0
PHY1
PHY2
PHY3
PHY4
PHY5
PHY6
PHY7
Bit 1.
Link/Activity
Bit 13.
Link/Activity
Bit 25.
Link/Activity
Bit 37.
Link/Activity
Bit 49.
Link/Activity
Bit 61.
Link/Activity
Bit 73.
Link/Activity
Bit 85.
Link/Activity
Bit 2.
Link1000/
Activity
Bit 14.
Link1000/
Activity
Bit 26.
Link1000/
Activity
Bit 38.
Link1000/
Activity
Bit 50.
Link1000/
Activity
Bit 62.
Link1000/
Activity
Bit 74.
Link1000/
Activity
Bit 86.
Link1000/
Activity
Bit 3.
Link100/
Activity
Bit 15.
Link100/
Activity
Bit 27.
Link100/
Activity
Bit 39.
Link100/
Activity
Bit 51.
Link100/
Activity
Bit 63.
Link100/
Activity
Bit 75.
Link100/
Activity
Bit 87.
Link100/
Activity
Bit 4. Link10/
Activity
Bit 16.
Link10/
Activity
Bit 28.
Link10/
Activity
Bit 40.
Link10/
Activity
Bit 52.
Link10/
Activity
Bit 64.
Link10/
Activity
Bit 76.
Link10/
Activity
Bit 88.
Link10/
Activity
Bit 5.
Reserved
Bit 17.
Reserved
Bit 29.
Reserved
Bit 41.
Reserved
Bit 53.
Reserved
Bit 65.
Reserved
Bit 77.
Reserved
Bit 89.
Reserved
Bit 6. Duplex/
Collision
Bit 18.
Duplex/
Collision
Bit 30.
Duplex/
Collision
Bit 42.
Duplex/
Collision
Bit 54.
Duplex/
Collision
Bit 66.
Duplex/
Collision
Bit 78.
Duplex/
Collision
Bit 90.
Duplex/
Collision
Bit 7.
Collision
Bit 19.
Collision
Bit 31.
Collision
Bit 43.
Collision
Bit 55.
Collision
Bit 67.
Collision
Bit 79.
Collision
Bit 91.
Collision
Bit 8. Activity Bit 20.
Activity
Bit 32.
Activity
Bit 44.
Activity
Bit 56.
Activity
Bit 68.
Activity
Bit 80.
Activity
Bit 92.
Activity



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