Device Control Codes; Signal Characteristics; Ttl Input Characteristics - Seagate Cheetah ST3450657FC Product Manual
Cheetah 15k.7 fc
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11.5.12 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 lists the supported codes.
Table 28 Device control code values
2 (
17)
1 (
18)
PIN
PIN
0
0
0
0
1
0
1
0
0
1
0
1
1
1
1
1
11.6
S
IGNAL CHARACTERISTICS
This section describes the electrical signal characteristics of the drive's input and output signals. See Table 24 on page 58
for signal type and signal name information.
11.6.1 TTL input characteristics
Table 29 provides the TTL characteristics.
Table 29 TTL characteristics
S
TATE
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)
C
15K.7 FC P
HEETAH
RODUCT
0 (
39)
PIN
D
EFINITION
0
Reserved for power failure warning.
1
Reserved for auto negotiation of link rate.
0
Reserved.
1
Reserved.
0
Reserved.
1
4.250 GHz operation on both ports.
0
2.125 GHz operation on both ports.
1
1.0625 GHz operation on both ports.
V
OLTAGE
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
M
, R
. E
ANUAL
EV
C
URRENT
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
63
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