Jameco-electronics Rabbit 3000 Manual do Utilizador descarregar pdf (Página 225)

100

101

216 Rabbit 3000 Microprocessor

Figure 16-1 illustrates the parameters used to describe memory access time.

Figure 16-1. Parameters Used to Describe Memory Access Time

Table 16-2 lists the delays in gross memory access time for several values of V

When the spectrum spreader is enabled with the clock doubler, every other clock cycle is

shortened (sometimes lengthened) by a maximum amount given in the table above. The

shortening takes place by shortening the high part of the clock. If the doubler is not

enabled, then every clock is shortened during the low part of the clock period. The maxi-

mum shortening for a pair of clocks combined is shown in the table.

Table 16-2. Data and Clock Delays V

±10%, Temp, -40°C–+85°C (maximum)

VDD

Clock to Address Output Delay

(ns)

Data Setup

Time Delay

(ns)

Spectrum Spreader Delay

(ns)

30 pF 60 pF 90 pF

Normal

no dbl/dbl

Strong

no dbl/dbl

3.3 6 8 11 1 3/4.5 4.5/9

2.7 7 10 13 1.5 3.5/5.5 5.5/11

2.5 8 11 15 1.5 4/6 6/12

1.8 18 24 33 3 8/12 11/22

delay capacitive

setup time data to clock

1 2 ... 220 221 222 223 224 225 226 227 228 229 230 ... 348 349

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