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QLogic Corporation
GEM318 Guardian Enclosure Management Controller
Data Sheet
Features
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Product Description
The GEM318 is a low-cost, self-contained storage backplane controller. It is a true single-chip solution - no additional components 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.
Figure 1. GEM318 Block Diagram
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RESET
Integrated backplane controller for SCSI Accessed Fault-Tolerant Enclosures (SAF-TE) applications Low voltage differential (LVD) SCSI interface Ultra2 and Ultra3 SCSI compatible Supports up to eight drives Eight LED control pins provided Global failure input Global alarm output Automatic hot swap detection Automatic fault notification Integrated master/slave I2 C interface Supports up to two LM75 temperature sensors Packaging: 80-pin thin quad flat pack (TQFP) 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)
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.
GEM318
DEVICE INSERTED WITH HOT SWAP DETECT FAULT IN LED7-0 (22 mA) DATA ASSEMBLER CONTROL REGISTERS G_ALARM - DRIVE FAULT - TEMP ALERT - FAULT_IN - HOST ALARM LVD SCSI SCSI INTERFACE ID_ON0 ID_ON1 I2C SENSOR NVRAM - INQ DATA - ENC CONFIG - SLOT SCSI ID - FEATURES TEMP SENSORS
CONFIG REGISTERS
I2C INTERFACE
TIMER
CLK
GEM318
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QLogic Corporation
Application
Figure 2 illustrates the GEM318 in one type of application.
DISK DRIVES FAN DEV_INS/SWAP POWER SUPPLY GLOBAL FAULT (FAULT_IN) DOOR OPEN DEV_INS/SWAP
DEV_INS/SWAP
DEV_INS/SWAP SLOT STATUS LEDS
EXTERNAL READ OF SLOT SCSI ID (OPTIONAL)
GEM318
DEV_INS/SWAP
PCF8575
PCF8575
(OPTIONAL) NVRAM
DEV_INS/SWAP
12C
DEV_INS/SWAP
LM75
LM75
DEV_INS/SWAP
TEMPERATURE SENSORS (OPTIONAL)
GLOBAL ALARM (G_ALARM)
Figure 2. GEM318 Application
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Interfaces
The GEM318 interfaces include a backplane management interface, an LVD SCSI interface, and an integrated master/slave I2C interface (see figure 3).
GEM318
BACKPLANE MANAGEMENT INTERFACE 8 DEV_INS7-0 FAULT_IN G_ALARM 8 18 SCL I2C INTERFACE 2 5 10 15 CLK RBIAS RESET TEST 1 NOTE: SC_DATA7-0 = 37, 39, 42, 44, 47, 49, 51, 53 SC_DATA7-0 = 38, 40, 43, 45, 48, 50, 52, 54 VDD = 4, 12, 29, 57, 70 GND = 6, 21, 26, 34, 41, 46, 55, 59, 67, 74 VDD GND SDA LED7-0 63-60, 7, 3-1 77 78 73-71, 69, 68, 66-64 27, 28 32, 33 30, 31 17, 18 56 8, 10, 9, 11 80 79 13, 14 22, 23 35, 36 SEE NOTE SEE NOTE SEE NOTE SEE NOTE 19, 20 15, 16 24, 25 5 58 75 76 80 MISCELLANEOUS ACK/ACK ATN/ATN BSY/BSY CD/CD DIFF_SENSE ID_ON1-0/ID_ON1-0 4 IO/IO MSG/MSG PARITY/PARITY SC_DATA7-0 SC_DATA7-0 SEL/SEL REQ/REQ RST/RST 2 41 2 2 8 8 2 2 2 2 2 2 2 SCSI INTERFACE
POWER AND GROUND
Figure 3. GEM318 Functional Signal Grouping
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QLogic Corporation
Hardware Functional Description
Input Pins
The GEM318 provides the following input pins. s Eight device inserted pins (DEV_IN7-0) with hot swap detect support s One fault input (FAULT_IN). This pin is host definable and programmable for general fault conditions such as drive fault, fan fault, power supply fault, and door open.
s
Certain operating parameters of the GEM318 may be programmed, for example, the number of temperature sensors, enabling an external SCSI read operation, and enabling a global fault.
Support for up to two LM75 or equivalent temperature sensors. The temperature threshold value is programmable. I2C slave interface support: Backplane status can be read from the GEM318 through the I2 C interface
s
Output Pins
The GEM318 provides the following output pins. s Eight LED control pins (LED7-0) s One global alarm (G_ALARM), driven by the (FAULT_IN) input and/or the SAF-TE Send Global command. Additionally, a user configurable output bit may be set by temperature out-of-range detected (if enabled) and/or drive failure (if enabled).
Two I2 C slave addresses are provided
Reset Input
While the reset input (RESET) is asserted, the GEM318 does the following: s Tristates all output pins. This feature is useful when multiple GEM318-equipped SCSI backplanes are be daisy chained and one or more of the GEM318 controllers must be disabled. s If the TEST pin is driven low while RESET is asserted, the LED7-0 outputs are asserted. This feature is useful as a production LED test mode.
SCSI Bus
The GEM318 SCSI bus provides support for the following. s LVD and single-ended SCSI operation s Differential sense input that automatically selects the bus operating mode s Eight-bit asynchronous data transfers, as defined by the SAF-TE specification s Wide SCSI addressing. The SCSI ID of the GEM318 device is determined by connecting one of the two ID_ON pins to the desired SCSI address signals on the SCSI bus. s SCSI reset assertion after device swap. The GEM318 can be programmed to assert the SCSI reset (RST) signal after a drive has been swapped. This feature allows a redundant array of independent disks (RAID) controller to automatically initiate a data rebuild operation.
Non-Volatile Memory Device
An optional 24C01A type NVRAM device can be connected through the I2 C bus. If installed, the default inquiry data is replaced with the data programmed into the NVRAM. The NVRAM also stores user programmable slot SCSI ID values.
Software Functional Description
SCSI Command Set
The following SCSI commands are supported: s Inquiry s Read Buffer s Write Buffer s Test Unit Ready s Request Sense s Send Diagnostic
I2C Bus Interface
The GEM318 contains a two-wire, I2 C -compliant serial bus with the following features. s Master and slave modes supported s The SCSI ID of each slot can be read by the GEM318 from an external Phillips PCF8575 device (two are needed for eight slots) s Support for an external NVRAM device that can contain the following: Vendor-defined inquiry data Slot SCSI ID. This data is returned to the host as part of the data. For implementations that do not use NVRAM or PCF8575 devices, the GEM318 automatically assigns the slot number.
SAF-TE Command Set
The following SAF-TE commands are supported: s Read Enclosure Configuration s Read Enclosure Status s Read Device Slot Status s Write Device Slot Status s Perform Slot Operation s Send Global Flags s Read Global Flags
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Enclosure Configuration
The GEM318 provides the host with the following enclosure configuration information: s Device slots supported (eight maximum) s Temperature sensors supported (two maximum)
s s s
Temperature out of range alert Drive status (good/fault status programmed by the host using the Write Device Slot Status command) Global failure bit status
Visual Indicators
The GEM318 controls status indicator lights for up to eight device slots. Table 1 describes the states that are displayed. The identify LED can be flashed with or without a drive inserted in the slot; consequently, it indicates which slot is housing the faulty device and shows the user in which slot to install a replacement drive.
Control Functions
The following control functions are provided: s LED on/off/flashing pattern (see table 1) s Global alarm on/off
Status Data
The following status information is reported: s Devices installed s Hot swap status s Slot SCSI ID (vendor programmable if NVRAM or a PCF8575 is implemented or automatically assigned by the GEM318) s Slots with unconfigured drives inserted (drives installed but not configured by host. Default power-on state is unconfigured) s Enclosure temperature value
NOTE: Issuing a SCSI Reset or Bus Device Reset message does not change the state of the indicator lights.
Table 1. Visual Indicator State
Device Status No Error Faulty or rebuild stopped Rebuild Identify Off Steady on Slow blink (~1/sec) Fast blink (~3/sec) Indicator Light
Packaging
The GEM318 is available in an 80-pin TQFP. Mechanical dimensions are illustrated in figure 4.
14.0 BSC PIN 60 PIN 61 12.0 BSC PIN 41 SEE DETAIL A
PIN 40 1.20 MAX 14.0 BSC
4 TYPICAL 12.0 BSC 0.17 ~ 0.27 INDEX MARK PIN 21 0.60 + 0.15 0.50
DETAIL A PIN 80
PIN 1 NOTE:
PIN 20 ALL DIMENSIONS ARE IN MILLIMETERS.
Figure 4. GEM318 Mechanical Drawings
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QLogic Corporation
The following are trademark acknowledgements: Phillips is a registered trademark of Phillips Electronics, N.V. National is a trademark of National Semiconductor Corporation All other brand and product names are trademarks or registered trademark of their respective holders.
Specifications are subject to change without notice. QLogic is a trademark of QLogic Corporation.
(c)November 8, 1999 QLogic Corporation, 3545 Harbor Blvd., Costa Mesa, CA 92626, (800) ON-CHIP-1 or (714) 438-2200
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