Air 486MI, Руководство пользователя, Страница: 31 / 44

·
Cache Write Cycle, Cache Burst Read Cycle : Follow below table
to set these Cache options.
CPU Clock Speed Cache Write
Cycle
Cache Burst
Read Cycle
20MHz or 25MHz 2T 1T
33MHz with 64KB or
256KB Cache
3T 1T
33MHz with 128KB
cache
3T 2T
40MHz 3T 2T
50MHz 3T 2T
·
ISA Bus Clock : Default setting is 7.16MHz for any CPU speed.
Latest ISA adapters may operate with ISA bus clock speed up to
10MHz. ISA bus speed above 10MHz is not recommended. For
Green PC operation, this clock must be set at 7.16MHz. Different
than 7.16MHz speed can also be selected by following below table.
CPU Clock Speed ISA Bus Clock
20MHz 1/2 CLK = 10MHz or
1/3 CLK = 6.67MHz
25MHz 1/3 CLK = 8.33MHz
33MHz 1/4 CLK = 8.33MHz
40MHz 1/4 CLK = 10MHz or
1/5 CLK = 8MHz
50MHz 1/5 CLK = 10MHz or
1/6 CLK = 8.33MHz.
·
Latch Local Bus Device, Local Bus Ready : Follow below table to
set these options.
CPU Clock Speed Latch Local
Bus Device
Local Bus
Ready
20MHz 2T TRANS
25MHz 2T TRANS
33MHz 2T SYNC
40MHz 2T SYNC
50MHz 2T or 3T SYNC
POWER MANAGEMENT SETUP
486MI System Board User's Manual Page 31