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EDS1232AATA-75L-E Datasheet(PDF) 22 Page - Elpida Memory |
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EDS1232AATA-75L-E Datasheet(HTML) 22 Page - Elpida Memory |
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22 / 53 page  EDS1232AATA Data Sheet E0386E40 (Ver. 4.0) 22 Programming Mode Registers The mode register is programmed by the Mode register set command using address bits A11 through A0, BA0 and BA1 as data inputs. The registers retain data until it is re-programmed, or the device loses power. The mode register has three fields; Options : A11 through A7, BA0, BA1 /CAS latency : A6 through A4 Wrap type : A3 Burst length : A2 through A0 Following mode register programming, no command can be issued before at least 2 CLK have elapsed. /CAS Latency /CAS latency is the most critical of the parameters being set. It tells the device how many clocks must elapse before the data will be available. The value is determined by the frequency of the clock and the speed grade of the device. ”Relationship between Frequency and Latency” shows the relationship of /CAS latency to the clock period and the speed grade of the device. Burst Length Burst Length is the number of words that will be output or input in a read or write cycle. After a read burst is completed, the output bus will become High-Z. The burst length is programmable as 1, 2, 4, 8 or full page. Wrap Type (Burst Sequence) The wrap type specifies the order in which the burst data will be addressed. This order is programmable as either “Sequential” or “Interleave”. The method chosen will depend on the type of CPU in the system. Some microprocessor cache systems are optimized for sequential addressing and others for interleaved addressing. “Burst Length Sequence” shows the addressing sequence for each burst length using them. Both sequences support bursts of 1, 2, 4 and 8. Additionally, sequence supports the full page length. |
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