SM320F28335PTPMEP Datasheet, PDF (133/167 Pages) Texas Instruments – Digital Signal Controller (DSC)

SM320F28335-EP
www.ti.com
SPRS581D – JUNE 2009 – REVISED MAY 2012
Table 6-36. XINTF Clock Configurations
MODE
1
Example:
2
Example:
3
Example:
4
Example:
SYSCLKOUT
150 MHz
150 MHz
150 MHz
150 MHz
XTIMCLK
SYSCLKOUT
150 MHz
SYSCLKOUT
150 MHz
1/2 SYSCLKOUT
75 MHz
1/2 SYSCLKOUT
75 MHz
XCLKOUT
SYSCLKOUT
150 MHz
1/2 SYSCLKOUT
75 MHz
1/2 SYSCLKOUT
75 MHz
1/4 SYSCLKOUT
37.5 MHz
The relationship between SYSCLKOUT and XTIMCLK is shown in Figure 6-23 .
PCLKR3[XINTFENCLK]
00
1
XTIMING0
XTIMING6 ^{LEAD/ACTIVE/TRAIL}
XTIMING7
XBANK
C28x ^SYSCLKOUT _{/2 1}
CPU
0
XTIMCLK
/2 1
0
XCLKOUT
XINTCNF2 (XTIMCLK)
XINTCNF2
(CLKMODE)
XINTCNF2
(CLKOFF)
Figure 6-23. Relationship Between XTIMCLK and SYSCLKOUT
6.14.4 XINTF Signal Alignment to XCLKOUT
For each XINTF access, the number of lead, active, and trail cycles is based on the internal clock
XTIMCLK. Strobes such as XRD, XWE0, XWE1, and zone chip-select (XZCS) change state in relationship
to the rising edge of XTIMCLK. The external clock, XCLKOUT, can be configured to be either equal to or
one-half the frequency of XTIMCLK.
For the case where XCLKOUT = XTIMCLK, all of the XINTF strobes will change state with respect to the
rising edge of XCLKOUT. For the case where XCLKOUT = one-half XTIMCLK, some strobes will change
state either on the rising edge of XCLKOUT or the falling edge of XCLKOUT. In the XINTF timing tables,
the notation XCOHL is used to indicate that the parameter is with respect to either case; XCLKOUT rising
edge (high) or XCLKOUT falling edge (low). If the parameter is always with respect to the rising edge of
XCLKOUT, the notation XCOH is used.
For the case where XCLKOUT = one-half XTIMCLK, the XCLKOUT edge with which the change will be
aligned can be determined based on the number of XTIMCLK cycles from the start of the access to the
point at which the signal changes. If this number of XTIMCLK cycles is even, the alignment will be with
respect to the rising edge of XCLKOUT. If this number is odd, then the signal will change with respect to
the falling edge of XCLKOUT. Examples include the following:
• Strobes that change at the beginning of an access always align to the rising edge of XCLKOUT. This is
because all XINTF accesses begin with respect to the rising edge of XCLKOUT.
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