Access Speed Select
Jumper fields BR6 and BR7 are provided to enable the access speed of the
EPROM/RAM areas to be adjusted to suit the devices fitted, see Table 19. Figure 18
shows the location of BR6 and BR7.
Table 19 Access Speed Selection
Jumper
Jumper
Access Times
Device
Closed
Closed
(ns)
Access
on BR7
on BR6
Min
Max.
Times (ns)
2 - 3
2 - 3
62
125
60
2 - 3
2 - 4
125
188
125
2 - 3
2 - 1
188
250
180 Default
1 - 2
2 - 3
125
250
125
1 - 2
2 - 4
250
375
250
1 - 2
2 - 1
375
500
375
Figure 18 Location of the Speed Selection Jumpers
BAT
.
2
1
4
3
BR6
3
2
1
BR7
PME68-1B Manual
Page 56 Issue 5
Summary of Contents for PME 68-1B
Page 8: ...Figure 1 The PME 68 1B Board Photograph not available in PDF PME 68 1B Manual Page 2 Issue 5...
Page 12: ...Figure 4 Component Layout Diagram P5 P4 P3 BAT PME 68 1B Manual Page 6 Issue 5...
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