Seagate ST9146853SS Savvio 15K SAS Product Manual - Page 66
Table 13, SAS pin descriptions, SAS transmitters and receivers
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Table 13: SAS pin descriptions Pin Signal name Signal type S1 Port A Ground S2* +Port A_in Diff. input pair S3* -Port A_in S4 Port A Ground S5* -Port A_out Diff output pair S6* +Port A_out S7 Port A Ground S8 Port B Ground S9* +Port B_in Diff. input pair S10 -Port B_in * S11 Port A Ground S12 -Port B_out * S13 +Port B_out * S14 Port B Ground Diff output pair * - Short pin to support hot plugging NC - No connection in the drive. Pin Signal name Signal type P1* NC (reserved 3.3Volts) P2* NC (reserved 3.3Volts) P3 NC (reserved 3.3Volts) P4 Ground P5 Ground P6 Ground P7 5 Volts charge P8* 5 Volts P9* 5 Volts P10 Ground P11 Ready LED * P12 Ground Open collector out P13 12 Volts charge P14 12 Volts * P15 12 Volts * 9.4.6 SAS transmitters and receivers A typical SAS differential copper transmitter and receiver pair is shown in Figure 15. The receiver is AC coupling to eliminate ground shift noise. TX Transmitter 100 TY Differential Transfer Medium Figure 15. SAS transmitters and receivers .01 RX Receiver 100 .01 RY 58 Savvio 15K SAS Product Manual, Rev. B