AN2905 Freescale Semiconductor / Motorola, AN2905 Datasheet - Page 7

• Manufacturer Part Number: AN2905
• Description: Clock Mode Selection for MSC8126 Mask Set K98M
• Manufacturer: Freescale Semiconductor / Motorola

5
Table 4 lists the steps for using the Excel worksheets.
When calculating clock frequencies, be sure to check the data sheet for the maximum/minimum input clock
frequencies and the errata for limitations.
6
There are no known errata in the K98M mask set that impose clock limitations. For a complete list of errata,
consult the Freescale web site listed on the back cover of this document.
7
Table 6 show the clock modes for mask set K98M and their respective bus/
Freescale Semiconductor
Step
3A
3B
1
2
Excel Worksheet Quick Guide
Errata
Mask Set K98M Configuration Modes
Start the Excel program and open the file that
corresponds to the MSC8126 mask set.
Select a worksheet:
• Clock Mode Chart
• Clocking Scheme
For the Clock Mode Chart worksheet:
• Enter CLKIN frequency into cell C5.
• Enter the maximum rated speed of the MSC8126
• Verify that there are no frequency violations in
For the Clocking Scheme worksheet:
• Enter CLKIN frequency into cell C5.
• Enter the Clock Mode number into cell C6.
• Enter the maximum rated speed of the MSC8126
• Verify that there are no frequency or errata violations
into cell E6.
columns R and S.
into cell C7.
(cell A10).
Mode
0
1
2
3
4
5
Clock Mode Selection for MSC8126 Mask Set K98M, Rev. 0
Action
Table 5. Clock Configuration Modes
Table 4. Excel Program Procedure
MODCK[3–5]
MODCK[1–2]
000-00
000-01
000-10
000-11
001-00
001-01
Bus/CLKIN Ratio
Select MSC812x_Mask_Set_K98M.xls
If Clock Mode Chart is chosen, perform step 3A.
If Clocking Scheme Chart is chosen, perform step 3B.
Refer to rows A22 through A55. Rows in yellow are valid
modes. Items in red are out of spec.
Refer to Section 7 or the Clock Mode Chart worksheet for
valid clock modes.
Cells A24 through D27 show the input values.
Cells A30 through D33 show the output values.
1
2
2
4
3
4
MSC8126
CLKIN
Core/Bus Ratio
Comments
and core/bus ratios.
3
3
4
4
3
3
Excel Worksheet Quick Guide
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