TMS320F2811 datasheet(128/173 Pages) TI

128 / 173 page

Electrical Specifications

127

April 2001 − Revised July 2007

SPRS174O

Unless otherwise specified, all XINTF timing is applicable for the clock configurations shown in Table 6−29.

Table 6−29. XINTF Clock Configurations

MODE

SYSCLKOUT

XTIMCLK

XCLKOUT

Example:

150 MHz

SYSCLKOUT

150 MHz

SYSCLKOUT

150 MHz

Example:

150 MHz

SYSCLKOUT

150 MHz

1/2 SYSCLKOUT

75 MHz

Example:

150 MHz

1/2 SYSCLKOUT

75 MHz

1/2 SYSCLKOUT

75 MHz

Example:

150 MHz

1/2 SYSCLKOUT

75 MHz

1/4 SYSCLKOUT

37.5 MHz

The relationship between SYSCLKOUT and XTIMCLK is shown in Figure 6−30.

XTIMING0

XTIMING1

XTIMING2

XTIMING6

XTIMING7

XBANK

LEAD/ACTIVE/TRAIL

1†

XCLKOUT

XTIMCLK

1†

C28x

CPU

XINTCNF2

(CLKMODE)

XINTCNF2

(XTIMCLK)

† Default Value after reset

SYSCLKOUT

XINTCNF2

(CLKOFF)

Figure 6−30. Relationship Between XTIMCLK and SYSCLKOUT

6.24

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, XWE, 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.

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