# swiConfigSec8KClock

Defines the source of the secondary 8 kHz clock on the bus.

#### Prototype

DWORD swiConfigSec8KClock ( SWIHD swihd, DWORD source, DWORD network)

Argument | Description
swihd | Switch handle .
source | Clock source for the secondary 8 kHz signal on a board. Refer to the Details section for acceptable values.
network | Device source of the secondary 8 kHz signal when source is MVIP95_SOURCE_NETWORK. Refer to the Details section for acceptable values.

#### Return values

Return value | Description
SUCCESS |
CTAERR_DRIVER_ERROR | Underlying driver retrieved an unrecognized error. Call swiGetLastError to retrieve the MVIP device error code.
CTAERR_INVALID_HANDLE | swihd is not a valid switch handle.
CTAERR_SVR_COMM | Communication error in the server environment.
SWIERR_INVALID_CLOCK_PARM | Value of a clock configuration parameter is invalid.
SWIERR_INVALID_PARAMETER | Board-specific clock parameter value is invalid.

#### Details

swiConfigSec8KClock establishes the source of the secondary 8 kHz clock on the bus.

Note: Call swiConfigBoardClock before calling swiConfigSec8KClock for the first time on a particular switch handle, to prevent the clock source from changing to OSC.

Acceptable values for source are:

- MVIP95_SOURCE_DISABLE

- MVIP95_SOURCE_INTERNAL

- MVIP95_SOURCE_NETWORK

Acceptable values for network are 1 to n where n is the number of devices on the board. Some devices are not capable of being a source for SEC8K. Refer to the device-specific hardware documentation for the devices that are capable of being a source for SEC8K.

Refer to Configuring the clocks for more information.

If CTAERR_DRIVER_ERROR is returned, call swiGetLastError to retrieve the MVIP device error code.

#### See also

swiConfigNetrefClock, swiGetBoardClock, swiGetTimingReference, swiOpenSwitch

#### Example

void myT1ClockInit(SWIHD swihd)
{
SWI_CLOCK_ARGS boardclock;
/* Make board sync off MVIP bus clock */
boardclock.size = sizeof(SWI_CLOCK_ARGS);
boardclock.clocktype = MVIP95_STD_CLOCKING;
boardclock.clocksource = MVIP95_SOURCE_MVIP;
swiConfigBoardClock(swihd, &boardclock);
/* Make board's network 1 provide the source of the Sec8K signal */
swiConfigSec8KClock(swihd, MVIP95_SOURCE_NETWORK, 1);
}