Seagate Enterprise Capacity 3.5 HDD/Savvio 10K Savvio 10K.1 FC Product Manual - Page 73
Signal characteristics
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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 26: 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 22 on page 62 for signal type and signal name information. 9.6.1 TTL input characteristics Table 27 provides the TTL characteristics. Table 27: TTL characteristics State Voltage 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) 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 Savvio FC Product Manual, Rev. D 67