TMS320VC5471GHKA datasheet(89/97 Pages) TI

89 / 97 page

Electrical Specifications

June 2001 – Revised December 2002

SPRS180C

6.15 ARM Clock Timings

The ARM SRAM timings are derived from the ARM clock. The clock switching characteristics are defined in

Table 6–35 for use in the ARM SRAM timing definitions.

Table 6–35. ARM SRAM Switching Characteristics

PARAMETER

MIN

TYP

MAX

UNIT

tc(ARM)

Cycle time, ARM clock

21.05

tw(ARM–H)

Pulse duration, ARM clock high

A/2 – 3†

A/2†

A/2 + 3†

tw(ARM–L)

Pulse duration, ARM clock low

A/2 – 3†

A/2†

A/2 + 3†

tw(ARM–W)

Pulse duration, ARM write cycle

A/2 + nA†‡

tw(ARM–R)

Pulse duration, ARM read cycle

A + nA†‡

† A = tc(ARM)

‡ n = the number of software wait states

The ARM SRAM write timing requirements listed in Table 6–36 represent back-to-back write operations to

a zero-wait-state SRAM device.

Table 6–36 through Table 6–37 assume testing over recommended operating conditions (see Figure 6–35

and Figure 6–36).

Table 6–36. ARM SRAM Timing Requirements (Write)

MIN

NOM

MAX

UNIT

td(CSL-AV)

Delay time, address valid from CS low

– 3

td(CSL-DV)

Delay time, data valid from CS low

–2

td(CSL-WEL)

Delay time, write enable low from CS low

tw(WEL)

Pulse width, write enable low

D – 3.5§

D§

D + 3.5§

td(WEH–AIV)

Delay time, address invalid from write enable high

td(WEH–DIV)

Delay time, data invalid from write enable high

td(WEH–DV)

Delay time, data valid from write enable high

tw(WEH)

Pulse width, write enable high

A/2 – 3.5†

A/2†

A/2 + 3.5†

td(WEH–CSH)

Delay time, CS high from write enable high

td(CSL–BEV)

Delay time, byte enable valid from CS low

– 3

td(WEH–BEIV)

Delay time, byte enable invalid from write enable high

td(WEH–BEV)

Delay time, byte enable valid from write enable high

td(CSL-OEH)

Delay time, output enable high from CS low

– 3

td(WEH–OEL)

Delay time, output enable low from write enable high

† A = tc(ARM)

§ D = tw(ARM-W)

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