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UPD48288209AF1 데이터시트(PDF) 17 Page - Renesas Technology Corp |
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UPD48288209AF1 데이터시트(HTML) 17 Page - Renesas Technology Corp |
17 / 54 page µµµµPD48288209AF1, µµµµPD48288218AF1, µµµµPD48288236AF1 R10DS0254EJ0101 Rev. 1.01 Page 17 of 53 Jan. 15, 2016 2. Operation 2.1 Command Operation According to the functional signal description, the following command sequences are possible. All input states or sequences not shown are illegal or reserved. All command and address inputs must meet setup and hold times around the rising edge of CK. Table 2-1. Address Widths at Different Burst Lengths Burst Length Configuration x9 x18 x36 BL=2 A0–A20 A0–A19 A0–A18 BL=4 A0–A19 A0–A18 A0–A17 BL=8 A0–A18 A0–A17 N/A Table 2-2. Command Table Operation Code CS# WE# REF# A0–AnNote1 BA0–BA2 Note Device DESELECT / No Operation DESEL / NOP H X X X X MRS: Mode Register Set MRS L L L OPCODE X 2 READ READ L H H A BA 3 WRITE WRITE L L H A BA 3 AUTO REFRESH AREF L H L X BA Notes 1. n = 20. 2. Only A0–A17 are used for the MRS command. 3. See Table 2-1. Remark X = “Don’t Care”, H = logic HIGH, L = logic LOW, A = valid address, BA = valid bank address 2.2 Description of Commands DESEL / NOP Note1 The NOP command is used to perform a no operation to the µPD48288209/18/36AF1, which essentially deselects the chip. Use the NOP command to prevent unwanted commands from being registered during idle or wait states. Operations already in progress are not affected. Output values depend on command history. MRS The mode register is set via the address inputs A0–A17. See Figure 2-5. Mode Register Bit Map for further information. The MRS command can only be issued when all banks are idle and no bursts are in progress. READ The READ command is used to initiate a burst read access to a bank. The value on the BA0–BA2 inputs selects the bank, and the address provided on inputs A0–A20 selects the data location within the bank. WRITE The WRITE command is used to initiate a burst write access to a bank. The value on the BA0–BA2 inputs selects the bank, and the address provided on inputs A0–A20 selects the data location within the bank. Input data appearing on the DQ is written to the memory array subject to the DM input logic level appearing coincident with the data. If the DM signal is registered LOW, the corresponding data will be written to memory. If the DM signal is registered HIGH, the corresponding data inputs will be ignored (i.e., this part of the data word will not be written). |
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