NEC SOPHO IP 5000 Command Reference Manual page 130

clock
Command Reference Guide
Syntax
clock { dceclk | dteclk1 | dteclk2 | dteclk3 | dteclk4 }
View
Serial interface view
Parameter
dceclk: Sets the interface clock selection mode to DCE clock.
dteclk1: Sets the interface clock selection mode to DTE clock option 1.
dteclk2: Sets the interface clock selection mode to DTE clock option 2.
dteclk3: Sets the interface clock selection mode to DTE clock option 3.
dteclk4: Sets the interface clock selection mode to DTE clock option 4.
Description
Using the clock command, you can set the clock selection mode for a
synchronous serial interface.
By default, dceclk (providing clock to the DTE device) and dteclk3 are selected
for the synchronous serial interfaces at the DCE side and the DTE side.
Different operating clocks are selected for the synchronous serial interfaces
working as DTE and DCE, as shown in the following figure.
Figure 1 Selecting a clock for a synchronous serial interface
In the figure, "TxClk" represents transmitting clock and "RxClk" receiving clock.
As a DCE device is required to provide clock for the remote DTE device, you
must select DCEclk as the operating clock for the synchronous serial interface
working as DCE.
Working as DTE, the synchronous serial interface must accept the clock
provided by the remote DCE. As transmitting and receiving clocks of
synchronization devices are independent, the receiving clock of a DTE device
can be either the transmitting or receiving clock of the DCE device. So is the
transmitting clock. Therefore, four clock options are available for a DTE device.
The following table gives the four clock selection options.
Table 3 Clock options available for a synchronous serial interface working as
DTE
Clock selection option
DTEclk1
DTEclk2
DTEclk3
DTEclk4
SOPHO
IP 5000/SOPHO IP6000
Description
TxClk = TxClk, RxClk = RxClk
TxClk = TxClk, RxClk = TxClk
TxClk = RxClk, RxClk = TxClk
TxClk = RxClk, RxClk = RxClk
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