 |
|
|
|
|
The AMD-760™ MP Chipset Product Overview
The AMD-760™ MP chipset is a high performance two-way multiprocessor
core logic solution for the AMD Athlon™ MP class processors. The high-performance
of the chipset is attributed to an enhanced AMD Athlon™ system bus, support
for DDR (Double Data Rate) memory technology, and AGP-4X graphics interface.
Together with other sophisticated core logic in memory and I/O control,
system and power management, the AMD-760MP chipset provides a powerful solution
for server and workstation platforms.
The AMD-760MP chipset consists of the following
components.
- AMD-762™ system controller (Northbridge)
- AMD-766™ peripheral bus controller (Southbridge)
Key Features
- Dual point-to-point, high-speed 266MHz 1
AMD Athlon™ system bus (supporting up to two processors)
- PC21002 DDR (Double Data Rate) memory
subsystem (supporting up to 4 GB of memory space)
- AGP-4X Graphics Interface (supports 1X and 2X modes)
- PCI 2.2 Compliant 33 MHz - 32/64-bit PCI Bus Interface
- Two-channel EIDE Interface supporting ATA 33/66/100 modes
- LPC bus
- Flash memory/GPIO Interface
- USB OHCI host controller supporting four ports
- SM-Bus
- IOAPIC support
- Serial IRQ support
- Power management support
These features combine to deliver unprecedented
performance to platforms implementing AMD processor technology.
AMD-762™ System Controller
The AMD-762™ System Controller provides the bridging function between
the high-speed host-processor buses, AGP Graphics subsystem, DDR memory
subsystem, and the PCI interface.
AMD-762™ System Controller Key Features
- Two 266 MHz point-to-point AMD Athlon system buses, providing uni-processor
or 2-way Symmetric Multiprocessor capability
- PC2100 DDR (Double Data Rate) Memory Controller with support for up
to 4 GB of memory space (supports four Registered DIMM slots)
- AGP-4X Interface (supporting 1X and 2X modes)
- Dual Mode PCI 2.2 Compliant PCI Bus Interface
- 33 MHz clock with 32-bit and 64-bit data path support. (Supports
up to seven PCI devices 3)
- 66 MHz clock with 32-bit and 64-bit data path support. (Supports
up to two PCI slots)
- 949-pin Ceramic Column Grid Array (CCGA) package
- 2.5 V Core
The AMD-762 system controller also supports the
66 MHz/32-bit/64-bit PCI bus mode 4
. In this mode, the AMD-762 system controller supports only two 66-MHz
PCI bus slots. For designs requiring both 66 MHz and 33 MHz PCI capability,
compatible Southbridge components implementing PCI-to-PCI bridging can
be used to provide 33 MHz bus expansion.
AMD-766™ Peripheral Bus Controller
The AMD-766™ peripheral bus controller integrates the I/O subsystems -
allowing communication to peripheral devices.
AMD-766™ Peripheral Bus Controller Key Features
- PCI 2.2 compliant 33 MHz/32-bit PCI Bus Interface
- LPC (Low Pin Count) bus interface (Includes an 8237-based register
set for DMA)
- GPIO/Flash Interface: 8 bits wide; support for Flash BIOS and attachment
of General Purpose I/O Devices (for example, buttons and switches)
- UDMA 33/66/100 compatible EIDE bus master controller
- Support for a primary and a secondary dual-drive port
- Supports PIO modes 1-4
- ATAPI
- Two separate FIFOs for DMA accesses and read prefetch and write
buffers for PIO accesses
- OHCI-based USB host controller (Includes a root hub and support for
four ports)
- Extensive ACPI-compliant power management logic
- Programmable C2, C3, and Power-On-Suspend states, Suspend-to-RAM,Suspend
to disk and soft off states
- Throttling
- Hardware traps
- System inactivity timer
- System management logic, including Total Cost of Ownership (TCO) registers
- Privacy/security logic, including ROM access control
- 32 pins multiplexed with General Purpose IO (GPIO) functionality
- AT-compatible Interrupt Controller (8259-based)
- Programmable interval timer (8254-based)
- Real-Time Clock (RTC)
- 256 bytes of CMOS RAM
- Battery-powered RAM
- ACPI-compliant extensions
- Register-compatible I/O APIC (82093)
- Legacy AT logic (including Port 61h logic, Gate A20 logic, Port 92h
logic, etc)
- Full SM-Bus implementation
- 272-pin BGA Package
- 3.3-volt core and output drivers; 5-V tolerant input buffers
1 The 266 MHz
speed represents a 133 MHz Clock signal, with data transfers on both clock
edges. This produces a (133 MHz clock) x (2 data transfers/clock) = 266M
transfers/sec = 266-MHz data rate.
2 PC2100 represents
DDR memory DIMMS that provide data rates of 2100 MB/s, calculated as (133-MHz
clock) x (2 data transfers/clock) x (8 Bytes/transfer) = 2100 MB/s.
3 The AMD-762™ system controller provides
eight PCI Bus REQ/GNT# signal pairs.
- One pair dedicated to the Southbridge (SBREQ, SBGNT#)
- 7 pairs dedicated to other PCI devices (REQ[6:0], GNT[6:0]#)
From a bus loading and signal integrity perspective,
AMD designs and tests its AMD-762 system controller-based reference design
platforms to accommodate five PCI bus slots (33-MHz mode). Neglecting
the Southbridge, this configuration leaves two REQ/GNT# signal pairs available
for additional motherboard PCI slots and devices (for example, SCSI components,
Network Interface Components, etc). It is up to the system designer to
perform the necessary analysis and testing to determine if additional
slots and devices can be supported.
4 This mode is
not supported when the AMD-762 System Controller is used in conjunction
with the AMD-766™ Peripheral Bus Controller. This mode can only be used
when the Northbridge is interfaced to a PCI 66 MHz capable Southbridge
that is compatible to the AMD-762 System Controller.
|
|
|
|
|
|
