GEM318 Datasheet | QLogic

Features s Integrated backplane controller for SCSI Accessed Fault-Tolerant Enclosures (SAF-TE) applications s Low voltage differential (LVD) SCSI interface s Ultra2 and Ultra3 SCSI patible s Supports up to eight drives s Eight LED control pins provided s Global failure input s Global alarm output s Automatic hot swap detection s Automatic fault notification s Integrated master/slave I2 C interface s Supports up to two LM75 temperature sensors s Packaging: 80-pin thin quad flat pack (TQFP) s Programmable options: ❒ Number of slots in enclosure ❒ SCSI ID of each drive slot; or enable GEM318 to read SCSI IDs from a user-programmable device ❒ Number of temperature sensors ❒ Temperature threshold value ❒ Enable/disable SCSI RESET after a new drive is inserted ❒ Define conditions that trigger an automatic global alarm ❒ Inquiry data (vendor ID, enclosure ID, product ID) Product Description The GEM318 is a low-cost, self-contained storage backplane controller. It is a true single-chip solution - no additional ponents are required. Its small footprint and low implementation cost make it ideal for entry-level storage subsystem and server applications. It is implemented as a standard LVD SCSI target device and supports the SAF-TE specification. The GEM318 reports enclosure configuration and status, detects and reports when a drive has been swapped, and controls visual indicators and alarms. The GEM318 also provides an I 2 C interface that operates in master and slave modes. As an I2C master, the GEM318 reads I2C based devices such as the National LM75 temperature sensor and the Phillips PCF8575. As an I2C slave, the GEM318 can be accessed by the host, allowing baseboard management controllers or service processors to read the enclosure status data from the GEM318. The GEM318 block diagram is illustrated in figure 1. DEVICE INSERTED WITH HOT SWAP DETECT FAULT IN I2C SENSOR NVRAM - INQ DATA - ENC CONFIG - SLOT SCSI ID - FEATURES TEMP SENSORS DATA ASSEMBLER CONTROL...