Information

NOTE
The clock frequency mentioned in the preceding table is given
as an example. Refer to the clocking chapter for the frequency
used to drive this module in the device.
43.4.3.3 After SCK Delay (t
ASC
)
The After SCK Delay is the length of time between the last edge of SCK and the negation
of PCS. See Figure 43-49 and Figure 43-50 for illustrations of the After SCK delay. The
PASC and ASC fields in the CTARx registers select the After SCK Delay by the formula
in the ASC field description. The following table shows an example of how to compute
the After SCK delay.
Table 43-56. After SCK Delay computation example
f
SYS
PASC Prescaler ASC Scaler After SCK Delay
100 MHz 0b01 3 0b0100 32 0.96 μs
NOTE
The clock frequency mentioned in the preceding table is given
as an example. Refer to the clocking chapter for the frequency
used to drive this module in the device.
43.4.3.4 Delay after Transfer (t
DT
)
The Delay after Transfer is the minimum time between negation of the PCS signal for a
frame and the assertion of the PCS signal for the next frame. See Figure 43-49 for an
illustration of the Delay after Transfer. The PDT and DT fields in the CTARx registers
select the Delay after Transfer by the formula in the DT field description. The following
table shows an example of how to compute the Delay after Transfer.
Table 43-57. Delay after Transfer computation example
f
SYS
PDT Prescaler DT Scaler Delay after Transfer
100 MHz 0b01 3 0b1110 32768 0.98 ms
NOTE
The clock frequency mentioned in the preceding table is given
as an example. Refer to the clocking chapter for the frequency
used to drive this module in the device.
Functional description
K20 Sub-Family Reference Manual, Rev. 2, Feb 2012
990 Freescale Semiconductor, Inc.