Toshiba A20-S259 Maintenance Manual - Page 26
One M306K9FCLRP chip functions as both KBC and EC., One TMP87PM48V chip is used.
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Page 26 highlights
1 Hardware Overview 1.2 System Unit Block Diagram q KBC/EC (Keyboard Controller/Embedded Controller) • One M306K9FCLRP chip functions as both KBC and EC. • KBC has the following functions: - Scan controller to check status of keyboard matrix - Interface controller between the keyboard scan controller and the system • EC has the following functions: - Power supply sequence control - System I/F - Thermal conditions control - Flash rewriting q PSC (Power Supply Controller) • One TMP87PM48V chip is used. • This controller controls the power sources. q Onboard memory: 0MB q Optional memory Two SO-DIMM slots are available for 128, 256, 512MB and 1GB memory modules, consisting of SDRAM chips. • PC2100 • 3.3 volts operation • No parity bit • Data transfer width is 64-bit • 128/256/512/1024 MB selectable - 128MB: eight 128Mbit (8M x 16bit) chips - 128MB: four 256Mbit (16M x 16bit) chips - 256MB: eight 256Mbit (16M x 16bit) chips - 512MB: eight 512Mbit (32M x 16bit) chips - 1GB: eight 1Gbit (64M x 16bit) chips q Sound CODEC • One AD1981B chip is used. • Internal Audio Controller is integrated into the MM1535+ chip. Both chips are used as the CODEC chip. q Battery E2 PROM: ST24C04FM • One ST24C04FM equivalent (128 words × 16-bit, I2C-Interface) is used. This memory maintains records of battery use. 1-12 Satellite A20 Maintenance Manual (960-444)