ENICSF2811PBKA datasheet(130/172 Pages) TI1

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TMS320F2810, TMS320F2811, TMS320F2812

TMS320C2810, TMS320C2811, TMS320C2812

SPRS174T – APRIL 2001 – REVISED MAY 2012

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6.23 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.

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

130

Electrical Specifications

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