Features of the AlphaPC 164 Motherboard
3
2 Features of the AlphaPC 164
Motherboard
This section lists the AlphaPC 164 motherboard features and shows the location of
major components, connectors, and jumpers.
AlphaPC 164 Features
The AlphaPC 164 motherboard uses a Digital Semiconductor 21164 Alpha micro-
processor and companion Digital Semiconductor 21172 core logic chipset.
Table 1 lists the features of the AlphaPC 164 motherboard. Figure 1 shows the board
outlines, and identifies the location of jumpers, connectors, and major components.
Table 2 lists and defines these items. Refer to Section 3 for jumper configurations.
Refer to Section 4 for connector pinouts.
Table 1 AlphaPC 164 Features
Feature
Description
Microprocessor
Digital Semiconductor 21164 Alpha microprocessor (64-bit RISC)
Chipset
Digital Semiconductor 21172 core logic chipset, consisting of one
control chip and four data chips, that provides an interface to system
memory and the PCI bus
DRAM memory
16MB to 512MB memory array -- One bank of either 4 (128-bit) or
8 (256-bit) commodity, 36-bit, 70-ns SIMMs
Caching
L1 Icache
8KB, direct-mapped, instruction cache on the CPU chip
L1 Dcache
8KB, direct-mapped, data cache on the CPU chip
L2 Scache
96KB, three-way, set-associative, write-back, unified instruction
and data cache on the CPU chip
L3 backup cache
Onboard 1MB, direct-mapped, synchronous SRAM backup cache
with 128-bit data path
I/O and miscellaneous support
32-bit and 64-bit, 33-MHz PCI
Four dedicated PCI expansion slots (two 64-bit)
PCI/IDE control (CMD646)
Intel 82378ZB PCI-to-ISA bridge chip
Two dedicated ISA expansion slots
SMC FDC37C935 combination chip provides control for diskettes,
two UARTs with modem control, parallel port, keyboard, mouse,
and time-of-year clock
1MB flash ROM
Firmware
Alpha SRM Console firmware
