DSP56300FM データシートの表示（PDF） - Freescale Semiconductor

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DSP56300FM

24-Bit Audio Digital Signal Processor

Freescale Semiconductor 

External Memory Expansion Port (Port A)

IRQA

26

25

A0–A17

First IRQA Interrupt Instruction Fetch

Figure 3-7 Recovery from Stop State Using IRQA Interrupt Service

AA0467

A0–A17

DMA Source Address

RD

WR

IRQA, IRQB,

IRQD,

NMI

29

First Interrupt Instruction Execution

Figure 3-8 External Memory Access (DMA Source) Timing

3.10 External Memory Expansion Port (Port A)

AA1104

3.10.1

SRAM Timing

Table 3-8 SRAM Read and Write Accesses1

No.

Characteristics

Symbol

Expression2

100 Address valid and AA assertion pulse width

tRC, tWC

(WS + 1) × TC − 4.0

[1 ≤ WS ≤ 3]

(WS + 2) × TC − 4.0

[4 ≤ WS ≤ 7]

(WS + 3) × TC − 4.0

[WS ≥ 8]

Min Max Unit

16.0 —

ns

56.0 —

ns

106.0 —

ns

3-12

DSP56364 Technical Data, Rev. 4.1

Freescale Semiconductor

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