MPCBL0010 SBC—Telecom Clock
Intel NetStructure® MPCBL0010 Single Board Computer
Technical Product Specification October 2006
164 Order Number: 304120
Additionally the currently selected redundant reference clock (REFSEL) is available.
Since the hitless switchover is executed by hardware automatically, the software only
has to read out the current status of the clock selection.
12.4 Telecom Clock API
This section describes how to configure the telecom clock using the telecom clock API.
The telecom clock API is included with the MontaVista* Linux Support Package (LSP)
for the MPCBL0010 SBC.
Note: The telecom clock API is open source. it has been implemented as the tlclk driver in
the main-line 2.6.15 kernel at http://www.kernel.org/pub/linux/kernel/v2.6/linux-
2.6.15.tar.bz2.
To access the telecom clock registers, it must first be enabled in the MontaVista Linux
kernel config file. Set the option CONFIG_TELCLOCK=m to enable the telecom clock
as a driver module in the kernel config file. Then use the command modprobe tlclk to
load the driver.
Note: For MontaVista Linux, the kernel config file is created by default as a hidden file. To see
it, you must do an “ls –a” in the root of the kernel source tree. The file name is
“.config”.

12.4.1 TRANSMIT CLOCK

See the table below to select the transmission clock frequency to the AdvancedMC B1
module or AdvancedMC B2 module.
Functions:
IOCTL_SELECT_AMCB2_TRANSMIT_CLOCK
IOCTL_SELECT_AMCB1_TRANSMIT_CLOCK

12.4.2 Enable/Disable Transmission Clock

To enable/disable the transmission clock for the AdvancedMC B1 module or
AdvancedMC B2 module, use the following:
Table 126. Module Transmission Frequency Selection
Name Used For Value
CLK_8kHz E1/T1/J1/J2 0xFF
CLK_1_544MHz T1/J1 0x00
CLK_2_048MHz E1 0x01
CLK_4_096MHz E1 0x02
CLK_6_312MHz J2 0x03
CLK_8_192MHz E1 0x04
CLK_19_440MHz E3/T3 0x06
CLK_8_592MHz E3/T3 0x08
CLK_16_384MHz E1/T1/J1/J2 0xFB
CLK_11_184MHz OC3, 12/STM-1, 4 0x09
CLK_34_368MHz E3/T3 0x0B
CLK_44_736MHz E3/T3 0x0A