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DSI SPCI Network Interface Boards Programmer's Manual Issue 7

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)

src

Sending Module ID

dst

MVD_TASK_ID

rsp_req

used to request a confirmation

hclass

status

Status Response (if confirmation requested)

err_info

len

PARAMETER AREA

Offset

Size

Name

bus_speed

clk_mode

pll_clk_src

ref1_mode

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

No change

4.096 MHz (Reserved for future use)

8.192 MHz

clk_mode

This parameter determines the clocking mode for the DSI SPCI Board, the permissible

values are as follows:

1 2 ... 46 47 48 49 50 51 52 53 54 55 56 ... 73 74

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