Interview questions - Revision history

Ted: /* ^ Hardware Questions */ - minor formatting.

2024-04-12T17:34:47Z

^ Hardware Questions: - minor formatting.

Ted: /* ^ Hardware Questions */ - minor formatting.

2024-04-12T17:33:30Z

^ Hardware Questions: - minor formatting.

Ted: /* ^ Hardware Questions */ - formatting test.

2024-04-12T17:31:47Z

^ Hardware Questions: - formatting test.

Ted: /* ^ Hardware Questions */ - add answer for difference between digital latch and flipflop.

2024-04-12T17:31:06Z

^ Hardware Questions: - add answer for difference between digital latch and flipflop.

Ted: /* ^ Hardware Questions */ - small formatting.

2024-04-12T17:28:38Z

^ Hardware Questions: - small formatting.

Ted: Amend some section titles.

2024-04-12T17:27:54Z

Amend some section titles.

Ted: Add section "Hardware Questions"

2024-04-12T17:26:47Z

Add section "Hardware Questions"

Ted: /* ^ Section 2 */

2022-06-09T19:07:57Z

^ Section 2

Ted: /* ^ Section 2 */

2022-06-09T19:07:21Z

^ Section 2

Ted: /* ^ Section 2 */

2022-06-09T19:06:43Z

^ Section 2

@@ Line 205: / Line 205: @@
 <ul>
-  *  What is the difference between a flip flop and a latch?<br />
+*  What is the difference between a flip flop and a latch?<br />
-  <ul><i>A:  latch is level triggered, flipflop is edge triggered</i></ul> <ul><i></i></ul>
+<ul><i>A:  latch is level triggered, flipflop is edge triggered</i></ul> <ul><i></i></ul>
- <br />
-  *  Describe some cache coherency problems with DMA.
+*  Describe some cache coherency problems with DMA. <br />
- <br />
+*  What is a register, and how would you design one? <br />
-  *  What is a register, and how would you design one?
+*  Describe some cache write policies. <br />
- <br />
+*  What does the 'volatile' keyword in C mean?
 </ul>

@@ Line 206: / Line 206: @@
 <ul>
    *  What is the difference between a flip flop and a latch?<br />
-   <ul><i>A:  latch is level triggered, flipflop is edge triggered</i></ul> <ul><i></i></ul><br />
+   <ul><i>A:  latch is level triggered, flipflop is edge triggered</i></ul> <ul><i></i></ul>
-<br />
+ <br />
-   *  Describe some cache coherency problems with DMA.<br />
+   *  Describe some cache coherency problems with DMA.
-<br />
+ <br />
    *  What is a register, and how would you design one?
-<br />
+ <br />
    *  Describe some cache write policies.
-<br />
+ <br />
    *  What does the 'volatile' keyword in C mean?
 </ul>

@@ Line 206: / Line 206: @@
 <ul>
    *  What is the difference between a flip flop and a latch?<br />
-   <ul><i>A:  latch is level triggered, flipflop is edge triggered</i></ul> <ul><i></i></ul>
+   <ul><i>A:  latch is level triggered, flipflop is edge triggered</i></ul> <ul><i></i></ul><br />
 <br />
-   *  Describe some cache coherency problems with DMA.
+   *  Describe some cache coherency problems with DMA.<br />
 <br />
    *  What is a register, and how would you design one?

@@ Line 205: / Line 205: @@
 <ul>
-   *  What is the difference between a flip flop and a latch?
+   *  What is the difference between a flip flop and a latch?<br />
 <br />
    *  Describe some cache coherency problems with DMA.

@@ Line 204: / Line 204: @@
 Some hardware questions from a Reddit post, found 2024-04-12 Friday:
    *  What is the difference between a flip flop and a latch?
+<br />
    *  Describe some cache coherency problems with DMA.
+<br />
    *  What is a register, and how would you design one?
+<br />
    *  Describe some cache write policies.
+<br />
    *  What does the 'volatile' keyword in C mean?
 Reddit post URL is https://www.reddit.com/r/ECE/comments/qrm1s/hardware_interview_preparation_help/?rdt=54932.
 <!-- odne komentar -->
 == [[#top|^]] References ==

@@ Line 6: / Line 6: @@
-== [[#top|^]] Section 1 ==
+== [[#top|^]] Section 1 Firmware Questions ==
 Starting pool of technical firmware oriented questions:
@@ Line 28: / Line 28: @@
-== [[#top|^]] Section 2 ==
+== [[#top|^]] Section 2 Firmware Questions ==
 [ ]  Q:  What uses and benefits of C enumerations can you describe?
@@ Line 61: / Line 61: @@
 <!-- comentario -->
-== [[#top|^]] Section 3 ==
+== [[#top|^]] Section 3 C Code Questions ==
 [ ]  Given this code fragment:

← Older revision		Revision as of 17:26, 12 April 2024
Line 200:		Line 200:
	<!-- comentario -->		<!-- comentario -->

		+	== [[#top\|^]] Hardware Questions ==
		+
		+	Some hardware questions from a Reddit post, found 2024-04-12 Friday:
		+
		+	* What is the difference between a flip flop and a latch?
		+
		+	* Describe some cache coherency problems with DMA.
		+
		+	* What is a register, and how would you design one?
		+
		+	* Describe some cache write policies.
		+
		+	* What does the 'volatile' keyword in C mean?
		+
		+	Reddit post URL is https://www.reddit.com/r/ECE/comments/qrm1s/hardware_interview_preparation_help/?rdt=54932.
		+
		+	<!-- odne komentar -->
	== [[#top\|^]] References ==		== [[#top\|^]] References ==

@@ Line 52: / Line 52: @@
 <ul>
 In the case of enums, the last element of the enumeration can potentially provide a count of the number of elements in the enum.  This assuming that the enum begins at 0 and has no gaps.  In this use case the last enumeration element doesn't count itself.  Trivial to add one if it's needed in the count.<br />
-<p>
 Aggregate assignments in C don't automatically count the number of elements assigned to a given array.  The size of the array, however, the storage space that is, divided by the size of the type of data stored in each array element gives the count of elements.  Hence aggregate assignments support automatic counting in that they don't require an array size to be predefined.
 </ul>

@@ Line 33: / Line 33: @@
 <ul>
 <i>
-A:  (1)  C enumerations provide a helpful labeling mechanism for states, tasks, or cases which require conditional handling.
+A:  (1)  C enumerations provide a helpful labeling mechanism for states, tasks, or cases which require conditional handling.<br />
-(2)  C enums are checked at compile time for duplicate integer values in the given enumeration.
+(2)  C enums are checked at compile time for duplicate integer values in the given enumeration.<br />
-(3)  C enums free programmers from having to adjust numeric values when adding and removing from the start or middle of the list, that is the enumeration.
+(3)  C enums free programmers from having to adjust numeric values when adding and removing from the start or middle of the list, that is the enumeration.<br />
 </i>
 </ul>
@@ Line 49: / Line 49: @@
 <ul>
 <i>
-A:  C enums and aggregate assignments both support automatic counting.  "Automatic counting" is not a formal C term or language feature.  In the case of enums, the last element of the enumeration can potentially provide a count of the number of elements in the enum.  This assuming that the enum begins at 0 and has no gaps.  In this use case the last enumeration element doesn't count itself.  Trivial to add one if it's needed in the count.
+A:  C enums and aggregate assignments both support automatic counting.  "Automatic counting" is not a formal C term or language feature.<br />
 Aggregate assignments in C don't automatically count the number of elements assigned to a given array.  The size of the array, however, the storage space that is, divided by the size of the type of data stored in each array element gives the count of elements.  Hence aggregate assignments support automatic counting in that they don't require an array size to be predefined.