Hot-Swap Controller (HSC) Architecture Intel® Server System S7000FC4UR
Revision 1.0
Intel order number E18291-001
302
28.1.3 GPIO Pins
Twenty GPIO pins are on the VSC410:
Eight for drive presence detection
Eight are for LED control
One for write protection control for both the SPI and I
2
C EEPROM devices
Two for SFF-8087 cable detection via side-band ground pins
One for jumper selecting either the SR4850HW4M or the S7000FC4UR platform. The
default position is the SR4850HW4M platform (no-fill); populate the jumper to select the
S7000FC4UR configurations.
28.1.4 Serial General-purpose Input / Output (SGPIO)
The VSC410 supports serial GPIO (SGPIO). This four-wire bus provides the status for up to 32
disks via a series of fault / locate / active bits. The hot-swap controller supports two SGPIO
interfaces (SGPIO0 and SGPIO1), according to the SFF-8485 specification. Each SGPIO
interface provides disks status for four disks. This implementation supports only SGPIO
communication from the host bus adapter (HBA) to the HSC (simplex).
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