
Telecom
12.4.15Read the Current Reference Clock
To determine the current reference clock used by the telecom clock, use the following:
Function:
IOCTL_READ_CURRENT_REF
Table 137. Reference Clock Values
Current Reference Clock | Value |
|
|
Primary Clock | 0 |
|
|
Secondary Clock | q |
|
|
12.4.16sysfs Interface
When the Telecom Clock driver is loaded, it creates a sysfs directory under /sys/ devices/platform/telco_clock.
This directory exports the following interfaces as shown in Table 138 where they are mapped to Telecom Clock API functions. (See Section 12.4, “Telecom Clock API” for information about using the Telecom Clock API.)
Table 138. Telecom Clock API Function Mapping for the sysfs Interface
sysfs Interface Name (File Name) | Telecom Clock API Function Name |
|
|
alarms | IOCTL_READ_ALARMS |
|
|
current_ref | IOCTL_READ_CURRENT_REF |
|
|
received_ref_clk3a | IOCTL_SELECT_RECEIVED_REF_CLK3A |
|
|
received_ref_clk3b | IOCTL_SELECT_RECEIVED_REF_CLK3B |
|
|
enable_clk3a_output | IOCTL_ENABLE_CLK3A_OUTPUT |
|
|
enable_clk3b_output | IOCTL_ENABLE_CLK3B_OUTPUT |
|
|
enable_clka0_output | IOCTL_ENABLE_CLKA0_OUTPUT |
|
|
enable_clka1_output | IOCTL_ENABLE_CLKA1_OUTPUT |
|
|
enable_clkb0_output | IOCTL_ENABLE_CLKB0_OUTPUT |
|
|
enable_clkb1_output | IOCTL_ENABLE_CLKB1_OUTPUT |
|
|
filter_select | IOCTL_FILTER_SELECT |
|
|
hardware_switching | IOCTL_HARDWARE_SWITCHING |
|
|
hardware_switching_mode | IOCTL_HARDWARE_SWITCHING_MODE |
|
|
telclock_version | - |
|
|
mode_select | IOCTL_MODE_SELECT |
|
|
refalign | IOCTL_REFALIGN |
|
|
reset | IOCTL_RESET |
|
|
select_amcb1_transmit_clock | IOCTL_SELECT_AMCB1_TRANSMIT_CLOCK |
|
|
select_amcb2_transmit_clock | IOCTL_SELECT_AMCB2_TRANSMIT_CLOCK |
|
|
select_redundant_clock | IOCTL_SELECT_REDUNDANT_CLOCK |
|
|
select_ref_frequency | IOCTL_SELECT_REF_FREQUENCY |
|
|
Note: All sysfs interfaces are integers in hex format, i.e., echo 99 > refalign has the same effect as echo 0x99
| Intel NetStructure® MPCBL0010 Single Board Computer |
October 2006 | Technical Product Specification |
Order Number: 304120 | 169 |