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Signal | Type | Driver | Name and Description |
SCSI_ID | O | GND/OPEN | SCSI ID. Sets internal SCSI ID depending on slot. Drive 1 has SCSI |
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SCSI_MATED_L | I/O | TTL | SCSI MATED. Determine if SCSI is present and has proper contact. |
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GND | I/O | PWR | Ground. Provide secondary ground reference. |
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+12V | O | PWR | +12 Volt supply. Max 1A of continuous current/6A peak current. |
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+5V | O | PWR | +5 Volt supply. Max 1.4A of continuous current/6A peak current. |
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7.3.6Fans
Each fan has an integral amber LED with a grounded cathode. This provides a small current to a transistor that drives the FAN[10..1]_PRES signal. This signal is read by server management through U2P1, and the PCA9555 I2C Port. Server management can also use U2P1 to turn on a FAN[10..1]_LED signal. FET drivers boost the current through the LED to brighten it.
The FAN_PWM signal from the Mainboard controls the fan speed. The FAN[10..1]_TACH signal is shaped by an FET buffer and driven to the Mainboard as FAN[10..1]_TACH_BUFF for determination of fan speed.
7.3.7 Internal Logic Signals
Table 48 is a summary of the signals that route between logic on the SCSI Backplane Board.
Table 48. Internal Logic Signals
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| Clks | CLK_10MHz | O | CMOS |
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| Control | ADDR<16..0> | O | CMOS | Address/bus. Address bus for the FLASH. |
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| PROM_VPP_L | O | CMOS | FLASH PROGRAM VOLTAGE ENABLE. Driven by the |
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| GEM359 to all FLASH to be programmed. |
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| Logic | PROM_OE_L | O | CMOS | FLASH output enable. Driven by the GEM359 to enable the |
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| FLASH for writing data on the bus. |
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| GEM359 | PROM_CE_L | O | CMOS | FLASH output enable. Driven by the PLD to enable the |
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| FLASH. |
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| PROM_WE_L | I | CMOS | FLASH chip enable. Driven by the GEM359 to enable |
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| writing to the FLASH. |
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| KCK_5V_L | O | Analog | 5 Volt kick start. Primes 5 Volt FET to start delivering power |
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| to a drive. |
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| Control | KCK_12V_L [1- | O | Analog | 12 Volt kick start. Primes 12 Volt FET, to start delivering |
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| FLT_5V_L | I | CMOS | 5 Volt |
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| Power |
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| drawn from 5V rail. |
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| FLT_12V_L | I | CMOS | 12 Volt |
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| SCSI |
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| drawn from 12V rail. |
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| I | Analog | 5 Volt stop. Stops 5 Volt FET from delivering power to a |
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| drive. |
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| I | Analog | 12 Volt stop. Stops 12 Volt FET from delivering power to a |
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| drive. |
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82 |
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| Revision 1.0 | |||
Intel order number