Jameco Electronics 3000, 2000 manual Symbol, Parameter, Minimum, Maximum

Models: 3000 2000

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The following table explains the parameters used in Figure 13-2.

Symbol

Parameter

Minimum

Maximum

(ns)

(ns)

 

 

 

 

 

 

Tsu(SCS)

/SCS Setup Time

5

 

 

 

 

Th(SCS)

/SCS Hold Time

0

 

 

 

 

Tsu(SA)

SA Setup Time

5

 

 

 

 

Th(SA)

SA Hold Time

0

 

 

 

 

Tw(SRD)

/SRD Low Pulse Width

40

 

 

 

 

Ten(SRD)

/SRD to SD Enable Time

0

 

 

 

 

Ta(SRD)

/SRD to SD Access Time

30

 

 

 

 

Tdis(SRD)

/SRD to SD Disable Time

15

 

 

 

 

Tsu(SRW – SRD)

/SWR High to /SRD Low Setup Time

40

 

 

 

 

Tw(SWR)

/SWR Low Pulse Width

40

 

 

 

 

Tsu(SD)

SD Setup Time

10

 

 

 

 

Th(SD)

SD Hold Time

5

 

 

 

 

Tsu(SRD – SWR)

/SRD High to /SWR Low Setup Time

40

 

 

 

 

The two SPD0R registers have special functionality not shared by the other data registers. If the master writes to SPD0R, an inbound interrupt flip-flop is set. If slave port interrupts are enabled, the slave processor will take a slave port interrupt. If the slave writes to the other SPD0R register, the slave attention line (/SLAVEATTN, pin 100) is asserted (driven low) by the slave processor. This line can be used to create an interrupt in the master. Either side that is interrupted can clear the signal that is causing an interrupt request by writ- ing to the slave port status register. The data bits are ignored, but the flip-flop that is the source of the interrupt request is cleared. Figure 13-3shows a logical schematic of this func- tionality.

User’s Manual

201

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Jameco Electronics 3000, 2000 manual Symbol, Parameter, Minimum, Maximum