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W3E32M64S-333SBM Datasheet(PDF) 7 Page - White Electronic Designs Corporation |
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W3E32M64S-333SBM Datasheet(HTML) 7 Page - White Electronic Designs Corporation |
7 / 17 page 7 White Electronic Designs Corporation • (602) 437-1520 • www.wedc.com White Electronic Designs W3E32M64S-XSBX July 2006 Rev. 5 TABLE 1 – BURST DEFINITION NOTES: 1. For a burst length of two, A1-Ai select two-data-element block; A0 selects the starting column within the block. 2. For a burst length of four, A2-Ai select four-data-element block; A0-1 select the starting column within the block. 3. For a burst length of eight, A3-Ai select eight-data-element block; A0-2 select the starting column within the block. 4. Whenever a boundary of the block is reached within a given sequence above, the following access wraps within the block. FIGURE 3 MODE REGISTER DEFINITION M3 = 0 2 4 8 Reserved Reserved Reserved M3 = 1 2 4 8 Reserved Reserved Reserved Reserved Operating Mode Normal Operation Normal Operation/Reset DLL All other states reserved 00 Valid Valid 0 1 Burst Type Sequential Interleaved CAS Latency Reserved Reserved 2 Reserved Reserved 2.5 Reserved Burst Length M0 0 1 0 1 0 1 0 1 Burst Length CAS Latency BT A9 A7 A6 A5 A4 A3 A8 A2 A1 A0 Mode Register (Mx) Address Bus M1 0 0 1 1 0 0 1 1 M2 0 0 0 0 1 1 1 1 M3 M4 0 1 0 1 0 1 0 1 M5 0 0 1 1 0 0 1 1 M6 0 0 0 0 1 1 1 1 M6-M0 M8 M7 Operating Mode A10 A11 * M14 and M13 (BA0 and BA1 must be "0, 0" to select the base mode register (vs. the extended mode register). 0* 0* BA0 BA1 Reserved Reserved Reserved Reserved M9 M10 M11 0 0 0 10 0 0 0 -- - - - - A12 M12 0 0 - HIGH, the corresponding data inputs will be ignored, and a WRITE will not be executed to that byte/column location. PRECHARGE The PRECHARGE command is used to deactivate the open row in a particular bank or the open row in all banks. The bank(s) will be available for a subsequent row access a specified time (tRP) after the PRECHARGE command is issued. Except in the case of concurrent auto precharge, where a READ or WRITE command to a different bank is allowed as long as it does not interrupt the data transfer in the current bank and does not violate any other timing parameters. Input A10 determines whether one or all banks are to be precharged, and in the case where only one bank is to be precharged, inputs BA0, BA1 select the bank. Otherwise BA0, BA1 are treated as “Don’t Care.” Once a bank has been precharged, it is in the idle state and must be activated prior to any READ or WRITE commands being issued to that bank. A PRECHARGE command will be treated as a NOP if there is no open row in that bank (idle state), or if the previously open row is already in the process of precharging. AUTO PRECHARGE AUTO PRECHARGE is a feature which performs the same individual-bank PRECHARGE function described above, but without requiring an explicit command. This is accomplished by using A10 to enable AUTO PRECHARGE Burst Length Starting Column Address Order of Accesses Within a Burst Type = Sequential Type = Interleaved 2 A0 0 0-1 0-1 1 1-0 1-0 4 A1 A0 0 0 0-1-2-3 0-1-2-3 0 1 1-2-3-0 1-0-3-2 1 0 2-3-0-1 2-3-0-1 1 1 3-0-1-2 3-2-1-0 8 A2 A1 A0 0 0 0 0-1-2-3-4-5-6-7 0-1-2-3-4-5-6-7 0 0 1 1-2-3-4-5-6-7-0 1-0-3-2-5-4-7-6 0 1 0 2-3-4-5-6-7-0-1 2-3-0-1-6-7-4-5 0 1 1 3-4-5-6-7-0-1-2 3-2-1-0-7-6-5-4 1 0 0 4-5-6-7-0-1-2-3 4-5-6-7-0-1-2-3 1 0 1 5-6-7-0-1-2-3-4 5-4-7-6-1-0-3-2 1 1 0 6-7-0-1-2-3-4-5 6-7-4-5-2-3-0-1 1 1 1 7-0-1-2-3-4-5-6 7-6-5-4-3-2-1-0 |
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