Transtech Transputer, Руководство пользователя

Страница: 56 / 200

Board Configuration Jumpers
48
Transputer Motherboard User Manual TMB M 711
5.3.1 On-board transputer clock and memory
The processor clock speed of the on-board transputer is selected by
SW2, switches 4, 5 and 6, as follows. You may set a clock speed
slower than that marked on the transputer, but not faster.
The number of cycles taken to access local memory of the on-board
transputer can be selected by SW3. The correct setting depends on
the SIMM’s row access time (T
RAC
), the clock speed of the transputer
(as set by SW2), and on the number of SIMMs fitted.
SW2.4 SW2.5 SW2.6 Processor clock
on off off 17.5 MHz
on on on 20 MHz (default)
on off on 25 MHz
off off on 30 MHz
Table 10: Processor clock speed select
Processor
clock
SIMM
speed
Cycles
SW
3.1
SW
3.2
SW
3.3
SW
3.4
20 MHz 70 ns 3 on off off off
25 MHz 60 ns
30 MHz 40 ns
20 MHz 90 ns 4 off on off off
25 MHZ 70 ns
30 MHz 60 ns
20 MHz 120 ns 5 off off on off
25 MHz 90 ns (default)
30 MHz 70 ns
6 off off off on
Table 11: Memory access time selection (up to 8 MBytes)