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Question Question Given a main memory DRAM where each chip contains 4 banks and each bank has a 4 byte Row Buffer (and there are four chips per rank for our 32-bit machine). Using the DRAM command timing given in slide 5A.20 what is the number of memory cycles needed to read in an 8 word block of data from consecutive word addresses (e.g., word0, word1, word2, word3, word 4, word5, word6, word7) if bank addressing is not interleaved? What is the number of memory cycles needed if bank addressing is interleaved as on slide 5A.37 slide 5A.20 : opening to bank if closed 10 units if same bank 2 units if different bank same chip copying the requested row’s bank data to its bank’s row buffer 1 unit issuing read and or write which reads/writes from/to the row buffer 1 unit closing the bank by writing from the row buffer back to the dram 1 unit Slide 5A.37: bank 0 0 1 2 3 16 17 18 19 bank 1 …… (and there are four chips per rank for our 32-bit machine). Using the DRAM command timing given in slide 5A.20 what is the number of memory cycles needed to read in an 8 word block of data from consecutive word addresses (e.g., word0, word1, word2, word3, word 4, word5, word6, word7) if bank addressing is not interleaved? What is the number of memory cycles needed if bank addressing is interleaved as on slide 5A.37 slide 5A.20 : opening to bank if closed 10 units if same bank 2 units if different bank same chip copying the requested row’s bank data to its bank’s row buffer 1 unit issuing read and or write which reads/writes from/to the row buffer 1 unit closing the bank by writing from the row buffer back to the dram 1 unit Slide 5A.37: bank 0 0 1 2 3 16 17 18 19 bank 1 ……

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Question

 Given a main memory DRAM where each chip contains 4 banks and each bank has a 4 byte Row Buffer (and there are

four chips per rank for our 32-bit machine).  Using the DRAM command timing given in slide 5A.20 what is the number of memory cycles needed to read in an 8 word block of data from consecutive word addresses (e.g., word0, word1, word2, word3, word 4, word5, word6, word7) if bank addressing is not interleaved?  What is the number of memory cycles needed if bank addressing is interleaved as on slide 5A.37

slide 5A.20 :

opening to bank if closed

10 units if same bank

2 units if different bank same chip

copying the requested row’s bank data to its bank’s row buffer 1 unit

issuing read and or write which reads/writes from/to the row buffer 1 unit

closing the bank by writing from the row buffer back to the dram 1 unit

Slide 5A.37:

bank 0

0   1   2   3  

16 17 18 19

bank 1 ……

 
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