Intel® 31244 PCI-X to Serial ATA Controller

Intel® 31244 PCI-X to Serial ATA Controller Interface Ports

5.4.3LED 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

3.3V

 

 

3.3V

 

 

3.3V

 

 

 

 

 

Serial EEPROM

 

Serial EEPROM

SDO

LED

3.3V

SDO

SI

 

SDO

SI

 

 

 

 

SDI

 

 

SDI

SO

 

SDI

SO

 

SCS#

LED

 

SCS#

CS#

 

SCS#

CS#

 

SCLK

3.3V

SCLK

SCK

 

SCLK

SCK

 

 

 

 

 

 

470W

 

470W

 

*

470W

 

 

LED

 

 

 

 

LED0

3.3V

 

 

 

 

 

LED

 

 

LED

 

 

LED0

3.3V

LED0

3.3V

 

LED

 

 

 

LED1

3.3V

LED1

LED

3.3V

LED1

LED

3.3V

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

LED

3.3V

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

LED

3.3V

 

 

 

 

 

 

 

 

A. Server Application:

 

B. Typical HBA:

 

C. Typical HBA:

 

 

4 LEDs

 

 

2 LEDs

 

4 LEDs

 

 

DPA Mode

 

 

Master/Slave Mode

 

Master/Slave or DPA Mode

 

No EEPROM

 

EEPROM for Boot code

 

EEPROM for Boot code

 

 

 

 

 

 

 

* Optional Buffers for off-board LEDs

34

Design Guide

Page 34
Image 34
Intel 31244 PCI-X manual LED Interface, SDO LED SDI SCS# Sclk SCK, LED LED0 LED1