The SFF-8484 (and newer SFF-8087) are used for internal four lane connections.
Common cable configurations are SFF-8484 to 4x SFF-8482 (plus a four pin Molex connector) or SFF-8484 to four 7-pin SATA style connectors.
| Pin Number |
Pin Name |
Description |
|---|---|---|
| 1 | GND | |
| 2 | Rx0+ | Lane 0 |
| 3 | Rx0- | Lane 0 |
| 4 | GND | |
| 5 | Tx0- | Lane 0 |
| 6 | Tx0+ | Lane 0 |
| 7 | GND | |
| 8 | Rx1+ | Lane 1 |
| 9 | Rx1- | Lane 1 |
| 10 | GND | |
| 11 | Tx1- | Lane 1 |
| 12 | Tx1+ | Lane 1 |
| 13 | GND | |
| 14 | Sideband 0 | |
| 15 | Sideband 1 | |
| 16 | Sideband 2 | |
| 17 | Sideband 3 | |
| 18 | Sideband 4 | |
| 19 | Sideband 5 | |
| 20 | GND | |
| 21 | Rx2+ | Lane 2 |
| 22 | Rx2- | Lane 2 |
| 23 | GND | |
| 24 | Tx2- | Lane 2 |
| 25 | Tx2+ | Lane 2 |
| 26 | GND | |
| 27 | Rx3+ | Lane 3 |
| 28 | Rx3- | Lane 3 |
| 29 | GND | |
| 30 | Tx3- | Lane 3 |
| 31 | Tx3+ | Lane 3 |
| 32 | GND |
Some lanes may be not connected in cable (depends on cable and host configuration). I.E. in cable with 3 physical links lane 3 pins (27,28,30,31) will be N/C.
SFF-8484 are directional and are wired differently if used at the "host" (controller) end than if used at the "target" (drive or drive rack/cage) end. SFF-8484 at the target end is probably less common but it was used in Supermicro CSE-M14T and some Dell Precision 29xx series drive cages.
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