LTC4332

17

Rev. A

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APPLICATIONS INFORMATION

CONFIG Register (RW)

FIELD

DESCRIPTION

REM_SS1_PHA

Remote Side SS1 Phase. When 0, MOSI is launched on the trailing SCK edge while MISO is captured on the leading SCK edge.

When 1, MISO is launched on the leading SCK edge while MISO is captured on the trailing SCK edge.

REM_SS1_POL

Remote Side SS1 SCK Polarity. When 0, SCK is low when idle. When 1, SCK is high when idle.

REM_SS2_PHA

Remote Side SS2 Phase.

REM_SS2_POL

Remote Side SS2 SCK Polarity.

REM_SS3_PHA

Remote Side SS3 Phase.

REM_SS3_POL

Remote Side SS3 SCK Polarity.

STATUS (RO)

FIELD

DESCRIPTION

NLINK

The level driven by pin LINK. High impedance is interpreted as 1.

NINT

The level driven by the local side pin INT. High impedance is interpreted as 1.

REM_NINT

The level driven into the remote INT pin. Link must be established.

SPEED_INDEX

<0-8>. Encoded index from values set on SPEED1 and SPEED2. See Table 2. Link Speed.

EVENT (W0C): Events Are Set by the System and Cleared by the User

FIELD

DESCRIPTION

LINK_GOOD

The local and remote SPI networks are connected.

LINK_LOST

The local and remote SPI networks have lost link communication.

FAULT

Set if any field in the FAULT register is set by the system. Clearing this bit clears all bits in the FAULT register.

INT_EN (RW): Asserts INT if Corresponding EVENT Bit Is Set

FAULT (RO): If the FAULT EVENT Bit Is Set, at Least One of the Following Bits Is Set.

To Clear, Clear the FAULT Event Bit

FIELD

DESCRIPTION

SPI_WRITE_FAULT

An incomplete write transfer after the register address byte or CRC error detected.

LINK_FAULT

Link communication corruption detected.

REM_SPI_FAULT

A fault or stuck bus timeout occurred on the remote SPI bus possibly due to link disconnection during transfer.

TX_BUF_OVERFLOW

The transmit buffer overflowed, SPI events lost. Indicates the local SPI frequency exceeds fSCK:SLAVE:MAX. See Table 2.

RX_BUF_UNDERFLOW The receive buffer overflowed, SPI events lost. Indicates the local SPI frequency exceeds fSCK:SLAVE:MAX. See Table 2.

WORD_LENGTH (RW)

FIELD

DESCRIPTION

WORD_LENGTH

Valid Range: 8 ≤ WORD_LENGTH ≤ 32. MISO read data from remote slave is delayed by WORD_LENGTH SCKs.

SCRATCH (RW)

FIELD

DESCRIPTION

SCRATCH

Used to test read/write access to the Control Interface.