Toshiba 420CDT - Page 6

1-6 420 Series
❑ System Controller Gate Array (SCPCNT-GA)
This gate array has the following functions:
• CPU control
- SMI control
- CPU clock control
• Memory control
- 64-bit bus memory control
- 32-bit bus memory control
• Bus control
- 64-bit data bus <==>32-bit data bus
- 32-bit local bus control
• Address latch control
• I/O register control
• Processing speed control
❑ ISA Bus Controller Gate Array (SISCNT-GA)
This gate array has the following functions:
• Bus control
- 32-bit data bus <==> 16-bit data bus
- ISA bus interface control
- ISA bus access control
- DMAC control
- DMA address generation
- I/O control
- Suspend/Resume sequence
• Memory control
- ISA bus interface control
- Refresh address generation
• I/O register control
• Suspend/Resume sequence
❑ PC Card Controller Gate Array
This gate array has the following functions:
• PCMCIA memory card control
• PCMCIA I/O card control
❑ I/O Controller Gate Array (IOCNT-GA)
This gate array has the following functions:
• Internal Communication controller
- KBC, main CPU communication register file
- KBC interrupt controller
- KBC communication controller
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2
C bus control