Specifications

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DSI SPCI Network Interface Boards Programmer's Manual Issue 7
51
4.3.11 MVD_MSG_CNFCLOCK - Configure Clock Request
Synopsis
Message sent to a DSI SPCI Board to configure the clocking mode for the board.
Format
MESSAGE HEADER
Field Name
Meaning
type
MVD_MSG_CNFCLOCK (0x7e20)
id
0
src
Sending Module ID
dst
MVD_TASK_ID
rsp_req
used to request a confirmation
hclass
0
status
Status Response (if confirmation requested)
err_info
0
len
8
PARAMETER AREA
Offset
Size
Name
0
2
bus_speed
2
2
clk_mode
4
2
pll_clk_src
6
2
ref1_mode
8
2
Reserved. Set to zero
Description
This message is used to control the on-board clock circuitry. It allows the user to select
the CT bus clocking mode and the reference clock sources for the local and bus
reference clocks.
The confirmation message (if requested) indicates success by status of zero.
Parameters
bus_speed
This parameter is used to set the CT bus speed; the permissible values are as follows:
Value
Bus speed
0
No change
2
4.096 MHz (Reserved for future use)
3
8.192 MHz
clk_mode
This parameter determines the clocking mode for the DSI SPCI Board, the permissible
values are as follows: