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3.5.2. J4 Signal Specification
3.5.2.1. Power Management
Signal
Pin Assignation
I2C-CLK
A1
I2C-DATA
B1
LID
C1
EXT_FAN0_FAIL#
D1
EXT_FAN1_FAIL#
E1
SM_BYPASS#
A2
3.5.2.2. SCSI Interface
Signal
Pin Assignation
E7, D7, C7, B7, A7,
E6, D6, C6, E2, D2,
SCSI:D0-D15
C2, B2, E8, D8, C8,
B8
A3
SCSI:IO#
B3
SCSI: REQ#
C3
SCSI:C/D
D3
SCSI: SEL#
E3
SCSI: SMSG
A4
SCSI: RST#
B4
SCSI: ACK#
SCSI: BSY#
C4
E4
SCSI: ATN#
SCSI: TERMPWR
C5, D5
SCSI: DPH#
A8
SCSI: DPH#
B6
Description
I2C clock signal
I2C data signal
Reserved
Enclosure fan 0 fail
Enclosure fan 1 fail
Reserved
Description
SCSI Data – The SCSI data lines drive the ID during
arbitration and selection, and command and data
information as well as status and messages.
In/Out – Indicates the In direction when asserted and
the Out direction when not asserted.
Request – A target will assert REQ to indicate a byte
is ready or is needed by the Target.
Command/Data – Indicates Command or message
phase when asserted, and Data phase when not
asserted.
SCSI Select – The line is driven after a successful
arbitration to select as an initiator or reselect as a
target and otherwise it is received.
SCSI Message - Indicates a Message phase when
asserted, and Command or Data phase when not
asserted.
Reset – Signal is interpreted as a hard reset and will
clear all commands pending on the SCSI bus.
Acknowledge – Indicate a byte is ready for or was
received from the Target.
Busy – Handshake signal used during arbitration.
Attention – This line is activated when a special
condition occurs.
Termination Power.
SCSI High Parity – Provide odd parity for data lines.
SCSI Low Parity – Provide odd parity for data lines
3.33
Installing the Board
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