Toshiba T4900CT - Page 7

T4900CT
1-7
❑ Sound Controller
Windows Sound System compatible sound unit is used. One AD1848 chip supports
PCM sound, and YMF262 (OPL3) with YAC512 (DAC) supports FM synthesizer
sound.
❑ Clock Generator receives 14.31818 MHz (X1) and generates the following frequen-
cies:
• 50 MHz for the CPU (CPU operates 75MHz)
• 14.7456 MHz for the COM
• 24 MHz for the FDC and VFO
• 16 MHz is used for GA
• 14.31818 MHz for Video Controller
OSC (X3) generates 32.768 KHz for RTC.
❑ Gate Array
System Controller Gate Array
This gate array has the following functions:
• CPU Controller
- SMI Control
- CPU Clock Control
• Memory Controller
- 64-bit bus memory control (standard DRAM area)
- 32-bit bus memory control (expansion memory area)
• Bus Controller
- 64 to/from 32-bit data path width convert
- 32-bit local bus control
• Address Latch Controller
- Address convert
- Address Latch
• I/O Register
- Register re-storing for resume
- Special Register
• Processing Speed Controller