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controller is that processor designs must now be synchronized with evolving memory standards As an example, the Opteron processors must be redesigned to take advantage of the new DDR2 DRAM standard, since the onboard controller will only work the older DDR standard In contrast, an off-chip memory controller {North Bridge in the Intel/PC terminology) can be more quickly redesigned and replaced to match new memory standards The ReadQ is used to buffer multiple outstanding reads; this decouples completion of a read from accepting the next one Quite often the processor will issue reads in bursts, as cache misses tend to occur in clusters and accepting multiple reads into the ReadQ prevents the bus from stalling Queueing up multiple requests may also expose more locality that the memory controller can exploit when it schedules DRAM commands Similarly, the WriteQ prevents the bus and processor from stalling by allowing multiple writes to be outstanding at the same time Furthermore, the WriteQ enables a latency-enhancing optimization for reads: since writes are usually not latency-critical, the WriteQ can delay them in favor of outstanding reads, allowing the reads to be satisfied first from the DRAM The delayed writes can be retired whenever there are no pending reads, utilizing idle memory channel cycles M e m o r y Reference Scheduling Of course, reference reordering in the memory controller is subject to the same correctness requirements as a pipelined processor for maintaining read-after-write (RAW), write-after-read (WAR), and write-afterwrite (WAW) dependences In effect, this means that reads cannot be reordered past pending writes to the same address (RAW), writes cannot be reordered past pending reads from the same address (WAR), and writes cannot bypass pending writes to the same address (WAW) If we are only reordering reads with respect to outstanding writes, only the RAW condition needs to be checked If a R A W condition exists between a pending write and a newer read, the read must either stall and wait for the write to be performed against the DRAM, or the read can be satisfied directly from the write queue Either solution will maintain correctness, while the latter should improve performance, since the latency of the read from the on-chip WriteQ will be lower than a read from an external DRAM chip However, in Section 3441 we showed how DRAM chips can exploit spatial locality by fetching multiple words from the same row by issuing different column addresses to the DRAM in back-to-back cycles These references can be satisfied much more quickly than references to different rows, which incur the latency for a row address transfer and row read in the internal DRAM array In current-generation DRAMs, rows can be as large as 8 kilobits; an eight-wide parallel organization (extrapolating from the two-wide parallel scheme shown in Figure 39) would result in an 8-kilobits row in physical memory Accesses to the same row can be satisfied much more quickly than references to other rows Hence, the scheduling logic in advanced memory controllers will attempt to find references to the same row in the ReadQ and WriteQ and attempt to schedule them together to increase the number of row hits This type of scheduling optimization can substantially reduce average DRAM read latency and improve sustained memory bandwidth, but can dramatically complicate the scheduling logic as well as the ReadQ and WriteQ bypass logic.

This time, we ve replaced the variable newEpisode with its exact opposite, itsARerun. Look at the logic that drives the if statement. Now we re combining itsARerun with the ! operator. Before, we cared whether the episode was a newEpisode. This time, we are concerned that the episode is not a rerun. See the difference Both the && and the || operators are summarized in the table in Table 6-3. Note that A&&B is only true if A and B are both true. A||B is true if A, B, or both are true.

Lab Exercise 304: Safeguarding Against Damage from Electrostatic Discharge (ESD)

On most keyboards, you type an & (ampersand) character by holding down the Shift key and typing a 7. You type a | character by holding down the Shift key and typing a \ (backslash). Don t confuse the | with the letter L or I, or with the ! character.

If you look in the folder Learn C Projects, you ll find a subfolder named 06.01 truthTester that contains a project that implements the three examples we just went through. Launch the project truthTester.xcodeproj. Take a look at the source code in main.c. Play with the code. Take turns changing the variables from true to false and back again. Use this code to get a good feel for the !, &&, and || operators. You might also try commenting out the line #include <stdbool.h> toward the top of the file. To do this, just insert the characters // at the very beginning of the line. When you compile, you ll get a number of errors complaining that bool, true, and false are undeclared. Remember this! As you write your own programs, be sure to #include <stdbool.h> if you want to use bool, true, and false.

Lab Exercise 304: Safeguarding Against Damage from Electrostatic Discharge (ESD)

All of the examples presented so far have consisted of relatively simple expressions. Here s an example that combines several different operators:

.

int myInt;

So far, everything that you ve explored has been accessible without removing the cover of the PC In the next few labs, you ll be opening up the case to explore the components inside As discussed in Mike Meyers CompTIA A+ Guide: Essentials, good techs always protect themselves and the systems they work on from damage caused by electricity and electrostatic discharge (ESD), the movement of a static charge from you to something you touch that can cause damage to sensitive electronic components Protecting yourself is fairly easy at this point: unplug the power cord from the electrical outlet and from the power supply on the PC (see Figure 3-6) To protect the system unit s sensitive components, you can use the following tools: Anti-static wrist strap Anti-static mat or anti-static wrist strap and mat combination Anti-static bag

myInt = 7; if ( (myInt >= 1) && (myInt <= 10) ) printf( "myInt is between 1 and 10" ); else printf( "myInt is not between 1 and 10" );

This example tests whether a variable is in the range between 1 and 10. The key here is the expression that lies between the if statement s parentheses:

(myInt >= 1) && (myInt <= 10)

Proper use of these tools will help safeguard the components of the system unit against ESD damage just as removing the power cord from the PC and the wall will help ensure that you are around to work on PCs for many years to come!