Appendix

Appendix D

D-1 POST CODES

POST (hex)

DESCRIPTION

CFh

Test CMOS R/W functionality.

C0h

Early chipset initialization:

 

-

Disable shadow RAM

 

- Disable L2 cache (socket 7 or below)

 

- Program basic chipset registers

C1h

Detect memory

 

- Auto-detection of DRAM size, type and ECC.

 

- Auto-detection of L2 cache (socket 7 or below)

C3h

Expand compressed BIOS code to DRAM

C5h

Call chipset hook to copy BIOS back to E000 & F000 shadow RAM.

01h

Expand the Xgroup codes locating in physical address 1000:0

02h

Reserved

03h

Initial Superio_Early_Init switch.

04h

Reserved

05h

1.

Blank out screen

 

2.

Clear CMOS error flag

06h

Reserved

07h

1.

Clear 8042 interface

 

2.

Initialize 8042 self-test

08h

1.

Test special keyboard controller for Winbond 977 series Super I/O

 

 

chips.

 

2.

Enable keyboard interface.

09h

Reserved

0Ah

1.

Disable PS/2 mouse interface (optional).

 

2.

Auto detect ports for keyboard & mouse followed by a port &

 

 

interface swap (optional).

 

3.

Reset keyboard for Winbond 977 series Super I/O chips.

0B-0Dh

Reserved

0Eh

Test F000h segment shadow to see whether it is R/W-able or not. If test

 

fails, keep beeping the speaker.

0Fh

Reserved

10h

Auto detect flash type to load appropriate flash R/W codes into the run

 

time area in F000 for ESCD & DMI support.

11h

Reserved

12h

Use walking 1’s algorithm to check out interface in CMOS circuitry.

 

Also set real-time clock power status, and then check for override.

13h

Reserved

14h

Program chipset default values into chipset. Chipset default values are

 

MODBINable by OEM customers.

15h

Reserved

16h

Initial Early_Init_Onboard_Generator switch.

17h

Reserved

D-1

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Intel FSB400 / DDR266 (PC2100), FSB800 (PC2700), FSB800 / DDR333 (PC2700), FSB800 (PC3200), FSB533 Appendix D, Post Codes

DDR266 (PC2100), DDR333 (PC2700), DDR400 (PC3200), FSB400 (PC2100), FSB800 / DDR400 (PC3200) specifications

Intel's FSB800 (PC2700) and FSB800 (PC3200) represent important milestones in memory technology, providing enhanced data transfer speeds and improved performance for computing systems. The FSB, or Front Side Bus, is a critical component that connects the CPU to the memory, affecting both system efficiency and speed.

FSB800 (PC2700) offers a bus speed of 800 MHz, supporting DDR (Double Data Rate) memory. It operates at PC2700 specifications, which allow for a data transfer rate of 2.7 GB/s. This configuration is particularly advantageous for users requiring improved multitasking capabilities and faster data processing. The technology behind FSB800 also facilitates advanced power management, contributing to energy efficiency while maintaining high-performance levels.

On the other hand, FSB800 (PC3200) ups the ante with compatibility for DDR400 memory. This arrangement fundamentally increases the data transfer capabilities to 3.2 GB/s, making it suitable for more demanding applications such as gaming, video editing, and other resource-heavy tasks. The ability to leverage higher memory speeds not only enhances responsiveness but also allows for better handling of larger datasets.

FSB400 (PC2100) represents an earlier generation of Intel's bus technology, running at 400 MHz and supporting DDR266 memory. Although it has lower performance specifications, it still offers a reliable platform for basic computing tasks and is widely used in budget systems. This early iteration laid the groundwork for subsequent advancements in memory technology.

DDR400 (PC3200) is a prominent feature in high-performance desktops and workstations. It operates at a data transfer rate of 3.2 GB/s, maximizing the data paths between memory and processors. This level of performance is essential for high-fidelity graphics and complex computing processes, making it a popular choice among enthusiasts and professionals alike.

Lastly, FSB800 / DDR333 (PC2700) serves as a versatile option, particularly for systems that benefit from a balanced approach to speed and stability. By supporting DDR333, this configuration ensures adequate memory performance without overwhelming the system's architecture.

In summary, these various configurations provided by Intel—FSB800 (PC2700), FSB800 (PC3200), FSB400 (PC2100), and DDR400 (PC3200)—underscore significant advancements in memory speed and efficiency, catering to an array of computing needs from basic tasks to high-performance demands. With each iteration, Intel has focused on enhancing data transfer rates, supporting multitasking capabilities, and improving overall system responsiveness, solidifying its role as a leader in memory technology.