Seagate 15K.3 ST373453FC Model Product Manual PDF - Page 72
Cheetah 15K.3 FC Product Manual, Rev. D, Device control codes, Signal characteristics, TTL input
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62 Cheetah 15K.3 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 lists the supported codes. Table 25: Device control code values 2 (pin 17) 0 0 0 0 1 1 1 1 1 (pin 18) 0 0 1 1 0 0 1 1 0 (pin 39) 0 1 0 1 0 1 0 1 Definition Reserved for power failure warning. Reserved for auto negotiation of link rate. Reserved. Reserved. Reserved. Reserved. 2.125 GHz operation on both ports. 1.0625 GHz operation on both ports. 9.6 Signal characteristics This section describes the electrical signal characteristics of the drive's input and output signals. See Table 21 on page 57 for signal type and signal name information. 9.6.1 TTL input characteristics Table 26 provides the TTL characteristics. Table 26: 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) Voltage 1.9 < VIH < 5.5V -0.5V < VIL < 0.9V 2.4 < VOH < 5.25V VOL < 0.5V 2.4 < VOH < 0.9 VCC VOH > 0.9VCC 0 < VOL < .45V 2.4 < VOH < 0.9 VCC VOH > 0.9VCC 0 < VOL < .45V Current IIH = ±500nA max. IOL = ±500nA max. IOH < -3mA IOL < 3mA IOH < -2.4mA IOH < -500µA IOL < 2.4mA IOH < -1.6mA IOH < -500µA IOL < 1.6mA 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 27 for the output characteristics of the LED drive signals. Table 27: LED drive signal State LED off, high LED on, low Current drive available 0 < IOH < 100µA IOL < -30 mA Output voltage 0 < VOL < 0.8V