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34 Design Guide
Intel
®
31244 PCI-X to Serial ATA Controller
Intel
®
31244 PCI-X to Serial ATA Controller Interface Ports
5.4.3 LED Interface
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 Channel 0 or Channel 1.
Likewise, LED1 goes LOW to turn on an Activity LED, anytime there is activity on either
Channel 2 or Channel 3. These two outputs may be wire-ORed together to use one LED for all four
ports. During EEPROM transfers, the LED function on SCLK and SDO is suspended. A buffer
may be required when the LEDs are located off-board and an EEPROM is used.
When GD31244 is configured in Direct Port Access mode (DPA_MODE# is LOW), then each port
is assigned its own LED as follows:
• Port 0 on LED0
• Port 1 on LED1
• Port 2 on LED2
• Port 3 on LED3
During EEPROM transfers, the LED function on SCLK and SDO is suspended. A buffer may be
required when the LEDs are located off-board and an EEPROM is used. Figure 10 shows a the
common configurations of using the serial EEPROM in conjunction with the LEDs.
Figure 10. LED and Serial EEPROM Configurations
SDO
SDI
SCS#
SCLK
3.3V
LED
3.3V
LED
3.3V
LED0
LED1
SDO
SDI
SCS#
SCLK
B. Typical HBA:A. Server Application:
LED
3.3V
LED
3.3V
LED0
LED1
LED
3.3V
LED
3.3V
3.3V
470W
470W
Serial EEPROM
SI
SO
CS#
SCK
SDO
SDI
SCS#
SCLK
LED0
LED1
LED
3.3V
LED
3.3V
3.3V
470W
Serial EEPROM
SI
SO
CS#
SCK
4 LEDs
DPA Mode
No EEPROM
2 LEDs
Master/Slave Mode
EEPROM for Boot code
C. Typical HBA:
4 LEDs
Master/Slave or DPA Mode
EEPROM for Boot code
LED
3.3V
LED
3.3V
* Optional Buffers for off-board LEDs
*