Intel IXF1104 manual 5.8.5Power-On,Reset, Initialization, 5.8.6LED DATA Decodes, Datasheet

IXF1104 Quad-Port 10/100/1000 Mbps Ethernet Media Access Controller

Note: The LED_DATA signal is now inverted from the state in Mode 0.

Figure 30. Mode 1 Timing

1	2	3	4	25	26	27	28	29	30	31	32	33	34	35
LED_CLK
LED_DATA			1	22	23	24	25	26	27	28	29	30
LED_LATCH

Table 33. Mode 1 Clock Cycle to Data Bit Relationship

LED_CLK Cycle	LED_DATA Name	LED_DATA Description
		This bit has no meaning in Mode 1 operation and is shifted out of
1	START BIT	the 16-stage shift register chain before the LED_LATCH signal is
		asserted.
		These bits have no meaning in Mode 1 operation and are shifted
2:3	PAD BITS	out of the 16-stage shift register chain before the LED_LATCH
		signal is asserted.
		These bits are the actual data to be transmitted to the 16-stage shift
4:15	LED DATA 1-12	register chain. The decode for each bit in each mode is defined in
		Table 34 on page 118.
		The data is INVERTD. Logic 1 (LED ON) = Low.
		These bits have no meaning in Mode 1 operation and are latched
36:38	PAD BITS	into positions 31 and 32 in the shift register chain. These bits are
		not considered as valid data and should be ignored. They should
		always be a Logic 0 = High.

5.8.5Power-On, Reset, Initialization

The LED interface is disabled at power-on or reset. The system software controller must enable the LED interface. The internal state machines and output signals are held in reset until the full IXF1104 4-Port Gigabit Ethernet Media Access Controller device configuration is completed. This is done by setting the LED_ENABLE bit to a logic 1 (see Table 109 “LED Control ($0x509)” on page 189). The power-on default for this bit is logic 0.

5.8.6LED DATA Decodes

The data transmitted on the LED_DATA line is determined by programming the global operation mode as either fiber or copper. Table 34 shows the data decode of the data for both fiber and copper MACs.

Datasheet 117

Document Number: 278757

Revision Number: 007

Revision Date: March 25, 2004