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HP 8100 manual PCI Express Bus Operation, Software/Driver Layer, Transaction Protocol Layer

Models: 8100

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System Support

The PCI bus supports a bus master/target arbitration scheme. A bus master is a device that has been granted control of the bus for the purpose of initiating a transaction. A target is a device that is the recipient of a transaction. The Request (REQ), Grant (GNT), and FRAME signals are used by PCI bus masters for gaining access to the PCI bus. When a PCI device needs access to the PCI bus (and does not already own it), the PCI device asserts its REQn signal to the PCI bus arbiter (a function of the system controller component). If the bus is available, the arbiter asserts the GNTn signal to the requesting device, which then asserts FRAME and conducts the address phase of the transaction with a target. If the PCI device already owns the bus, a request is not needed and the device can simply assert FRAME and conduct the transaction. Table 4-2 shows the grant and request signals assignments for the devices on the PCI bus.

Table 4-2.

PCI Bus Mastering Devices

Device

REQ/GNT Line

Note

 

 

 

PCI Connector Slot 1

REQ0/GNT0

 

 

 

 

PCI Connector Slot 2

REQ1/GNT1

[1]

 

 

 

PCI Connector Slot 3

REQ2/GNT2

[1]

 

 

 

NOTE:

[1] CMT form factor only

PCI bus arbitration is based on a round-robin scheme that complies with the fairness algorithm specified by the PCI specification. The bus parking policy allows for the current PCI bus owner (excepting the PCI/ISA bridge) to maintain ownership of the bus as long as no request is asserted by another agent. Note that most CPU-to-DRAM accesses can occur concurrently with PCI traffic, therefore reducing the need for the Host/PCI bridge to compete for PCI bus ownership.

4.2.2 PCI Express Bus Operation

The PCI Express (PCIe) v1.1 bus is a high-performace extension of the legacy PCI bus specification. The PCIe bus uses the following layers:

■Software/driver layer

■Transaction protocol layer

■Link layer

■Physical layer

Software/Driver Layer

The PCIe bus maintains software compatibility with PCI 2.3 and earlier versions so that there is no impact on existing operating systems and drivers. During system intialization, the PCIe bus uses the same methods of device discovery and resource allocation that legacy PCI-based operating systems and drivers are designed to use.

Transaction Protocol Layer

The transaction protocol layer processes read and write requests from the software/driver layer and generates request packets for the link layer. Each packet includes an identifier allowing any required responcse packets to be directed to the originator.

 

Technical Reference Guide

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HP 8100 manual PCI Express Bus Operation, Software/Driver Layer, Transaction Protocol Layer, PCI Bus Mastering Devices
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8100 specifications

The HP 8100 series is a line of powerful and versatile printers designed to meet the demanding needs of businesses and offices. Known for its durability and efficiency, the HP 8100 is particularly popular among professionals seeking high-quality prints with fast turnaround times.

One of the standout features of the HP 8100 is its capability to deliver impressive print speeds. With a print speed of up to 60 pages per minute, this printer significantly reduces wait times, allowing businesses to increase productivity. Furthermore, the first page out time is remarkably fast, making it ideal for busy office environments requiring quick document retrieval.

The HP 8100 utilizes HP's advanced LaserJet technology, which ensures sharp and consistent print quality across a range of media types. The printer is capable of producing professional-grade documents with a resolution of up to 1200 x 1200 dpi, making text crisp and images vibrant. This high-quality output is essential for creating marketing materials, reports, and other important documentation.

Another significant characteristic of the HP 8100 is its expandable paper handling capabilities. The printer comes with a standard input tray that accommodates a substantial volume of paper, while optional trays can be added to further increase capacity. This flexibility is particularly beneficial for businesses managing high-volume printing tasks.

The HP 8100 is equipped with a variety of connectivity options, including USB, Ethernet, and wireless capabilities. This versatility allows for easy integration with existing office networks, enabling multiple users to access the printer simultaneously. Additionally, mobile printing features support printing from smartphones and tablets, enhancing convenience for on-the-go professionals.

Energy efficiency is another major advantage of the HP 8100 series. Designed to consume less energy, this printer adheres to energy-saving standards, which can help reduce operational costs for businesses. The printer’s efficiency is complemented by its reliable performance, often with minimal maintenance requirements, ensuring that it remains a staple in the office for years to come.

In the realm of security, HP provides several features to protect sensitive information. Secure printing options and user authentication help safeguard documents, which is crucial for maintaining confidentiality in corporate environments.

Overall, the HP 8100 series stands out for its exceptional print speed, high-quality output, robust connectivity options, and energy efficiency. These characteristics make it an excellent choice for businesses looking to enhance their printing capabilities.