Air 486SH, Руководство пользователя, Страница: 27 / 39

· 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.
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
486SH System Board User's Manual Page 27