60

Cheetah 10K.6 FC Product Manual, Rev. B

9.5.12Device control codes

The drive inputs a Device Control Code on the DEV_CTRL_CODE lines at power up to determine the link rate on the Fibre Channel ports. Both ports run at the same rate. If the backpanel does not connect to these lines, the drive has 10K ohm pull up resistors that default the device control code to 7 (1.0625 GHz). Table 24 lists the supported codes.

Table 24: Device control code values

2 (pin 17)

1 (pin 18)

0 (pin 39)

Definition

 

 

 

 

 

 

 

 

0

0

0

Reserved for Power failure warning.

 

 

 

 

0

0

1

Reserved for auto negotiation of link rate.

 

 

 

 

0

1

0

Reserved.

 

 

 

 

0

1

1

Reserved.

 

 

 

 

1

0

0

Reserved.

 

 

 

 

1

0

1

Reserved.

 

 

 

 

1

1

0

2.125 GHz operation on both ports.

 

 

 

 

1

1

1

1.0625 GHz operation on both ports.

 

 

 

 

9.6Signal characteristics

This section describes the electrical signal characteristics of the drive’s input and output signals. See Table 20 on page 55 for signal type and signal name information.

9.6.1TTL input characteristics

Table 25 provides the TTL characteristics.

Table 25:

TTL characteristics

 

 

 

 

 

 

 

State

 

Voltage

Current

 

 

 

 

 

 

 

 

 

 

Input high

 

1.9

< VIH < 5.5V

IIH = ±500nA max.

Input low

 

-0.5V < VIL < 0.9V

IOL = ±500nA max.

Output high (-EN Bypass A, B)

2.4

< VOH < 5.25V

IOH < -3mA

Output low (-EN Bypass A, B)

VOL < 0.5V

IOL < 3mA

Output high (-Parallel ESI)

2.4

< VOH < 0.9 VCC

IOH < -2.4mA

 

 

VOH > 0.9VCC

IOH < -500µA

Output low (-Parallel ESI)

0 < VOL < .45V

IOL < 2.4mA

Output high (all other outputs)

2.4

< VOH < 0.9 VCC

IOH < -1.6mA

 

 

VOH > 0.9VCC

IOH < -500µA

Output low (all other outputs)

0 < VOL < .45V

IOL < 1.6mA

9.6.2LED driver signals

Fault and Active LED signals are located in the FC-SCA connector (J1) and through the indicator connector (J6). See Table 26 for the output characteristics of the LED drive signals.

Table 26: LED drive signal

State

Current drive available

Output voltage

 

 

 

 

 

 

LED off, high

0 < IOH < 100µA

 

LED on, low

IOL < -30 mA

0 < VOL < 0.8V

Page 70
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Seagate ST336607FC Device control codes, Definition, Signal characteristics, TTL input characteristics, LED driver signals

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