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cPCI-MXS64GX Technical Reference Manual
3.5.2. J4 Signal Specification
3.5.2.1. Power Management
Signal
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
SD 0-15
E7, D7, C7, B7, A7, E6,
D6, C6, E2, D2, C2, B2,
E8, D8, C8, B8
/IO
A3
/SREQ
B3
/CD
C3
/SSEL
D3
/SMSG
E3
/RST
A4
/ACK
B4
/BSY
C4
/SATN
E4
/WIDEPS
B5
TERMPWR
C5, D5
/SDPH, /SDPL
A8, B6
Pin Assignation
Pin Assignation
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.
Wide Present – When Low, indicates that a wide (16-
bit) cable is present.
Termination Power.
SCSI High/Low Parity – Provide odd parity for data
lines.
3.32
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