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Historically, back-to-back accesses to the same row have been called page-mode accesses These same-row accesses complete much faster (up to 3 times faster in current-generation DRAM) since they do not incur the additional latency of providing a row address, decoding the row address, precharging the bit lines, and reading the row out of the memory cell array into the row buffer This creates a performance-enhancing scheduling opportunity for the memory controller, which we will revisit in Section 3442 DRAM chips also share the pins of the data bus for both reads and writes While it is easy to pipeline a stream of reads or a stream of writes across such an interface, alternating reads with writes requires a bus turnaround Since the DRAM chip is driving the data bus during reads, while the memory controller is driving it during writes, care must be taken to ensure that there is never a time during which both the memory controller and DRAM chip are attempting to drive the bus, as this could result in a short-circuit condition between the respective drivers Hence, the interface must be carefully designed to allow enough timing margin for the current bus master (eg, the DRAM chip on a read) to stop driving the bus before the new bus master (eg, the memory controller on a write) starts to drive the bus This results in additional delay and reduces the efficiency of the DRAM interface R a m b u s D R A M In the late 1990s, an alternative standard called Rambus DRAM (RDRAM) emerged from research in high-speed signaling at Stanford University RDRAM employed many of the techniques that more recent standards for synchronous DRAM (eg, DDR2) have since adopted, including advanced signaling, higher interface frequencies, and multiple data words per clock period RDRAM chips also provide a row buffer cache which contains several of the most recently accessed DRAM rows; this increases the probability that a random access can be satisfied with much lower latency from one of the row buffer entries, avoiding the row access latency To improve interface bandwidth, RDRAM carefully specifies the physical design for board-level traces used to connect RDRAM chips to the controller, and uses source-synchronous clocking (ie, the clock signal travels with the data) to drive clock frequencies several times higher than more conventional SDRAM approaches As a result of these optimizations, RDRAM is able to provide substantially higher bandwidth per pin, albeit at a higher product cost and increased design time due to the stringent physical design requirements High bandwidth per pin is very useful in systems that require lots of bandwidth but relatively little capacity Examples of such systems that use RDRAM are the Sony Playstation 2 and Microsoft X-Box game controllers, which provide only 32 Mbytes of memory in their base configuration while requiring lots of memory bandwidth to support intensive three-dimensional gaming A modest capacity requirement of only 32 Mbytes could be satisfied by a single currentgeneration 256-Mbit DRAM chip However, since that DRAM chip only has a small number of data pins (between 2 and 16, typically 4 or 8), each pin must provide very high bandwidth to satisfy the system's overall bandwidth demand In contrast, general-purpose computer systems such as personal computers typically contain at least an order of magnitude more memory, ranging from at.

The if statement in this piece of code first tests the value of myInt. Since myInt is not equal to 0, the printf() gets executed.

classroom is equipped with one, use the IP address or printer name of the printer when con guring the port This will allow you to actually test the installation a In Windows 2000/XP, open the Printer & Faxes folder by way of Start | Control Panel | Printers & Faxes and launch the Add Printer Wizard by clicking Add a printer under Printer Tasks In Windows Vista, go to Start | Control Panel | Printers Right-click in the window and select Add Printer On the welcome screen, click Next Select Local printer attached to this computer in Windows 2000/XP (note the information balloon at the bottom of the dialog box, shown in Figure 15-2) or Add a local printer in Windows Vista In Windows 2000/XP, clear the Automatically detect and install my Plug and Play printer box Click Next Click the Create a new port radio button and select Standard TCP/IP Port from the drop-down menu This launches the Add Standard TCP/IP Printer Port Wizard (see Figure 15-3) Click Next In the Add Port dialog box, enter the IP address of the network printer The Add Standard TCP/IP Printer Port Wizard automatically creates the port name (see Figure 15-4) Click Next If the IP address is ctitious, for the purpose of completing the lab steps, the Add Standard TCP/IP Printer Port Wizard will be unable to identify the printing device In the Additional Port Information Required dialog box, click the drop-down menu for Standard and select Hewlett Packard Jet Direct (see Figure 15-5) Click Next Review the port characteristics and click Finish (see Figure 15-6) You will now follow the steps through the Printer Wizard by selecting a printer from the list of printers or your driver disc as you did when directly connecting to the printer in Step 2

C expressions have a special set of operators, called comparative operators. Comparative operators compare their left sides with their right sides and produce a value of either 1 or 0, depending on the relationship of the two sides. For example, the operator == determines whether the expression on the left is equal in value to the expression on the right. The expression

evaluates to 1 if myInt is equal to 5 and to 0 if myInt is not equal to 5. Here s an example of the == operator at work:

Again, if you are unable to install an actual print device for this exercise, don t print a test page You ll receive some interesting messages if you try

if ( myInt == 5 ) printf( "myInt is equal to 5" );