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UPD48288118AF1 Folha de dados(PDF) 24 Page - Renesas Technology Corp |
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UPD48288118AF1 Folha de dados(HTML) 24 Page - Renesas Technology Corp |
24 / 52 page µµµµPD48288118AF1 R10DS0255EJ0101 Rev. 1.01 Page 24 of 51 Jan. 15, 2016 2.11 Read Operation (READ) Read accesses are initiated with a READ command, as shown in Figure 2-12. Row and bank addresses are provided with the READ command. During READ bursts, the memory device drives the read data edge-aligned with the QK signal. After a programmable READ latency, data is available at the outputs. The data valid signal indicates that valid data will be present in the next half clock cycle. The skew between QK and the crossing point of CK is specified as tCKQK. tQKQ0 is the skew between QK0 and the last valid data edge considered the data generated at the Q0–Q8. tQKQ1 is the skew between QK1 and the last valid data edge considered the data generated at the Q9–Q17. tQKQx is derived at each QKx clock edge and is not cumulative over time. After completion of a burst, assuming no other commands have been initiated, Q will go High-Z. Back-to-back READ commands are possible, producing a continuous flow of output data. Minimum READ data valid window can be expressed as MIN.(tQKH, tQKL) – 2 x MAX.(tQKQx) Any READ burst may be followed by a subsequent WRITE command. Figure 2-16. READ followed by WRITE, BL=2, RL=4, WL=5, Configuration 1 and Figure 2-17. READ followed by WRITE, BL=4, RL=4, WL=5, Configuration 1 illustrate the timing requirements for a READ followed by a WRITE. Figure 2-12. READ Command Remark A : Address BA: Bank address CK# CK WE # REF# CS# ADDRESS BANK ADDRESS Don't care A BA |
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