DSP56600FMSLASHAD datasheet(51/76 Pages) NXP

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Specifications

External Interface Module (EIM) Timing

Preliminary

MOTOROLA

DSP56651 Technical Data Sheet

2-9

EXTERNAL INTERFACE MODULE (EIM) TIMING

The EIM provides the bus interface between the DSP56651 and external memory and

peripherals. It uses the external address bus, data bus, bus control signals, and the

chip select signals.

Table 2-10

EIM External Bus Output AC Timing Specifications1

Num

Characteristics

MCU @16.8 MHz

Unit

Min

Max

MCU_CLK rise to address and R/W valid2

—4

MCU_CLK rise to address and R/W invalid (output hold)

—

MCU_CLK rise to CS asserted

—

MCU_CLK rise to CS deasserted (output hold)

—

MCU_CLK fall to OE, EB asserted (read, OEA = 0),

EB asserted (write)3

—4

MCU_CLK rise to OE, EB asserted (read, OEA = 1)3

—4

MCU_CLK rise to OE, EB deasserted (output hold) (read)3

0—

MCU_CLK rise to EB deasserted (output hold) (write, WEN = 0)

—

MCU_CLK fall to EB deasserted (output hold) (write, WEN = 1)

—

MCU_CLK fall to OE, EB asserted (WSC = 0)3

—4

MCU_CLK rise to OE, EB deasserted (output hold) (WSC = 0)3

0—

Data-in valid to MCU_CLK rise (setup)

—

MCU_CLK rise to data-in invalid (hold)

—

MCU_CLK rise to data-out valid

—

MCU_CLK rise to data-out invalid (output hold)

—

MCU_CLK rise to data-out high impedance

—

MCU_CLK fall to data-out valid (WSC = 0)

—

MCU_CLK rise to data-out invalid (output hold) (WSC = 0)

—

MCU_CLK rise to data-out high impedance (WSC = 0)

—

Note:

The following notes apply to this table:

•

Output timing is measured at the pin. The specifications assume a capacitive load of 50 pF.

•

R/W, EB, and CS deassertion to address change is 0 ns minimum.

•

MCU_CLK can be viewed on the CKO pin by programming the clock control register (CKCTL).

Address setup to R/W and CS assertion is 0 ns minimum.

EB outputs are asserted for reads if the EBC bit in the corresponding CS control register is clear.

Freescale Semiconductor, Inc.

For More Information On This Product,

Go to: www.freescale.com

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