EW31244SL7QV Datasheet, PDF (30/252 Pages) Intel Corporation – Intel® 31244 PCI-X to Serial ATA Controller

Intel^® 31244 PCI-X to Serial ATA Controller
Overview
2.8
Figure 3.
ACTIVITY LEDS
Serial ATA interfaces on disk drives do not include the traditional ATA output which drives an LED
to indicate that the drive is active. The GD31244 compensates for this missing function by adding
four LED outputs which sink 10 mA. In Master/Slave compatibility mode, LED0 goes LOW to turn
on an Activity LED anytime there is activity on either Port 1 or Port 2. Likewise, LED1 goes LOW to
turn on an Activity LED anytime there is activity on either Port 3 or Port 4. These two outputs may be
wire “Or’d” together to use one LED for all four ports. If the GD31244 is configured in Direct Port
Access mode (MS_DA is LOW), then each port is assigned its own LED as follows: Port 1 on LED0,
Port 2 on LED1, Port 3 on SCLK and Port 4 on SDO. During EEPROM transfers, the LED function
on SCLK and SDO is suspended. A buffer may be required if the LEDs are located off-board and an
EEPROM is used. Through programmable registers, the GD31244 may be set up so that LED0
internally combines the status of all four ports for single LED use.
Common LED and Serial EEPROM Options
30
April 2004
Developer’s Manual