Toshiba TECRA S1 manual Hardware Overview System Unit Block Diagram

1 Hardware Overview 1.2 System Unit Block Diagram

BIOS ROM (flash E2PROM)

•4Mb x 1 chip (512KB flash parts)

−64 KB used for system BIOS

−64 KB used for VGA

−20 KB used for PnP

−4 KB for password security

−36 KB used for bootstrap

−84 KB used for ACPI P code

−36 KB used for LOGO

−48 KB used for LAN

−64 KB used for EC BIOS

−92 KB reserved

−3.3 volt operation

−Access time of 90 ns

−8-bit data transfer

System controllers

•North Bridge: Intel 855 PM (ODEM) (MCH-M)

−CPU interface and control

−DRAM control

−PCI master/slave interface (PCI R2.2 compliant)

−AGP master/slave interface (AGP1.0 compliant, AGP V2.0 compliant x 4 modes)

•South Bridge: Intel ICH4-M

−Enhanced DMA controller

−Interrupt controller

−Counter/timer

−PCI IDE controller

−Support for ATA-66 (GB) and ATA-100 (30/40/60 GB)

−USB interface

−SMBus interface

−Super I/O interface

−Power management control

−Suspend/resume control

−ACPI support

PC Card controller

•CB720

−CardBus/PC Card controller

−SD Card controller

1-8 TECRA S1 Maintenance Manual