User`s manual

1.2 System Components and Features
Figure 1–1 AlphaPC64 Functional Block Diagram
- TriQuint PLL
Clock
- External Clock
Oscillator
- Serial Boot ROM
- Power Supply
- Supervisor
- System Clocking
21064A Support
Alpha 21064A
Microprocessor
Running at
200 MHz to
275 MHz
L2 Cache Interface
- L2 Cache PALs
- Address Buffers
L2 Cache SIMMs
- 512KB
- 2MB
- 8MB
- Longword Parity
DECchip 21071-CA
21072 Chipset
- Cache/Memory
Control
- 208-Pin Package
DECchip 21071-BA
- 128-Bit Data Path
- Requires Four
DECchip
21071-BA Chips
PCI Devices *
PCI Arbitration
ISA Interface
DECchip 21071-DA
- PCI Bridge
- 208-Pin Package
- 2 or 3 Expansion
Slots
ISA Expansion Memory Buffering
ABT162244
Buffers
Memory SIMMs
- 128-bit Data Path
- Longword Parity
- 16MB to 512MB
- 2 Banks
- National 87312
- Intel 8242 Mouse
and Keyboard
- System Support
- IDE
LJ04129A.AI5
PCI
Bus
buff_
address
oe weand
L2 Cache
Control
Address
tag_adr
data<15:0>
Address
data<127:0>
Check Bits<21, 14, 7, 0>
*Three PCI Expansion Slots with
One Shared Expansion Slot
AddressISA Bus
Memory
data<127:0>
Memory
Control
b_mctl
b_addr
1–2 AlphaPC64 Introduction