TMS320F2811 datasheet(129/173 Pages) TI

129 / 173 page

Electrical Specifications

128

April 2001 − Revised July 2007

SPRS174O

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.

Examples:

XZCSL

Zone chip-select active low

XRNWL

XR/W active low

•

Strobes that change at the beginning of the active period will align to the rising edge of XCLKOUT if the

total number of lead XTIMCLK cycles for the access is even. If the number of lead XTIMCLK cycles is odd,

then the alignment will be with respect to the falling edge of XCLKOUT.

Examples:

XRDL

XRD active low

XWEL

XWE active low

•

Strobes that change at the beginning of the trail period will align to the rising edge of XCLKOUT if the total

number of lead + active XTIMCLK cycles (including hardware waitstates) for the access is even. If the

number of lead + active XTIMCLK cycles (including hardware waitstates) is odd, then the alignment will

be with respect to the falling edge of XCLKOUT.

Examples:

XRDH

XRD inactive high

XWEH

XWE inactive high

•

Strobes that change at the end of the access will align to the rising edge of XCLKOUT if the total number

of lead + active + trail XTIMCLK cycles (including hardware waitstates) is even. If the number of lead +

active + trail XTIMCLK cycles (including hardware waitstates) is odd, then the alignment will be with

respect to the falling edge of XCLKOUT.

Examples:

XZCSH

Zone chip-select inactive high

XRNWH

XR/W inactive high

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