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Inactive bus states, Figure 10–40. iostrb read and read, 3 inactive bus states – Texas Instruments TMS320C3x User Manual

Page 354

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Bus Timing

10-51

TMS320C32 Enhanced External Memory Interface

Figure 10–40. IOSTRB Read and Read

I/O Read

I/O Read

IOSTRB

RDY

D

A

R/W

H1

H3

10.10.3

Inactive Bus States

Figure 10–41 and Figure 10–42 show the signal states when a bus becomes
inactive after an IOSTRB or STRBx, respectively. The strobes (STRB0,
STRB1, IOSTRB, and R / W) are deasserted going to a high level. The address
bus preserves the last value and the ready signal (RDY) is ignored.

Figure 10–41. Inactive Bus States Following IOSTRB Bus Cycle

I/O Write

IOSTRB

RDY

D

A

R/W

H1

H3

Bus inactive RDY ignored