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Cheetah 73LP FC Product Manual, Rev. D
9.5.12
Device 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 23 lists the
supported codes.
Table 23:
Device control code values
2 (pin 17)
1 (pin 18)
0
0
0
0
0
1
0
1
1
0
1
0
1
1
1
1
9.6
Signal characteristics
This section describes the electrical signal characteristics of the drive's input and output signals. See Table 19
on page 52 for signal type and signal name information.
9.6.1
TTL input characteristics
Table 24 provides the TTL characteristics.
Table 24:
TTL characteristics
State
Input high
Input low
Output high (-EN Bypass A, B)
Output low (-EN Bypass A, B)
Output high (-Parallel ESI)
Output low (-Parallel ESI)
Output high (all other outputs)
Output low (all other outputs)
9.6.2
LED driver signals
Fault and Active LED signals are located in the FC-SCA connector (J1) and through the indicator connector
(J6). See Table 25 for the output characteristics of the LED drive signals.
Table 25:
LED drive signal
State
Current drive available
LED off, high
0 < I
OH
LED on, low
I
< -30 mA
OL
0 (pin 39)
Definition
0
Reserved for Power failure warning.
1
Reserved for auto negotiation of link rate.
0
Reserved.
1
Reserved.
0
Reserved.
1
Reserved.
0
2.125 GHz operation on both ports.
1
1.0625 GHz operation on both ports.
Voltage
1.9 < V
< 5.5V
IH
-0.5V < V
< 0.9V
IL
2.4 < V
< 5.25V
OH
V
< 0.5V
OL
2.4 < V
< 0.9 V
OH
V
> 0.9V
OH
CC
0 < V
< .45V
OL
2.4 < V
< 0.9 V
OH
V
> 0.9V
OH
CC
0 < V
< .45V
OL
Output voltage
< 100µA
0 < V
Current
I
= ±500nA max.
IH
I
= ±500nA max.
OL
I
< -3mA
OH
I
< 3mA
OL
I
< -2.4mA
CC
OH
I
< -500µA
OH
I
< 2.4mA
OL
I
< -1.6mA
CC
OH
I
< -500µA
OH
I
< 1.6mA
OL
< 0.8V
OL
57
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