DSP56857E datasheet(31/53 Pages) FREESCALE

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Host Interface Port

56857 Technical Data, Rev. 6

Freescale Semiconductor

4.7 Host Interface Port

Table 4-8 Host Interface Port Timing1

Operating Conditions: VSS = VSSIO = VSSA = 0 V, VDD = 1.62-1.98V, VDDIO = VDDA = 3.0–3.6V, TA = –40° to +120°C, CL ≤ 50pF, fop = 120MHz

1. The formulas: T = clock cycle. f ipb = 60MHz, T = 16.7ns.

Characteristic

Symbol

Min

Max

Unit

See Figure

Access time

TACKDV

—13

4-19

Disable time

TACKDZ

3—

4-19

Time to disassert

TACKREQH

3.5

4-19

4-22

Lead time

TREQACKL

0—

4-19

4-22

Access time

TRADV

—13

4-20

4-21

Disable time

TRADX

5—

4-20

4-21

Disable time

TRADZ

3—

4-20

4-21

Setup time

TDACKS

3—

4-22

Hold time

TACKDH

1—

4-22

Setup time

TADSS

3—

4-23

4-24

Hold time

TDSAH

1—

4-23

4-24

Pulse width

TWDS

5—

4-23

4-24

Time to re-assert

1. After second write in 16-bit mode

2. After first write in 16-bit mode

or after write in 8-bit mode

TACKREQL

4T + 5

5T + 9

4-19

4-22

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