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IS46TR16640BL Datasheet(PDF) 10 Page - Integrated Silicon Solution, Inc |
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IS46TR16640BL Datasheet(HTML) 10 Page - Integrated Silicon Solution, Inc |
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10 / 88 page  IS43/46TR16640B, IS43/46TR16640BL IS43/46TR81280B, IS43/46TR81280BL Integrated Silicon Solution, Inc. – www.issi.com – 10 Rev. C1 11/12/2014 2.3.2 Mode Register MR0 The mode register MR0 stores the data for controlling various operating modes of DDR3 SDRAM. It controls burst length, read burst type, CAS latency, test mode, DLL reset, WR and DLL control for precharge Power-Down, which include vendor specific options to make DDR3 SDRAM useful for various applications. The mode register is written by asserting low on CS#, RAS#, CAS#, WE#, BA0, BA1, and BA2, while controlling the states of address pins according to the following figure. 1. A13 must be programmed to 0 during MRS. 2. WR (write recovery for autoprecharge)min in clock cycles is calculated by dividing tWR(in ns) by tCK(in ns) and rounding up to the next integer: WRmin[cycles] = Roundup(tWR[ns] / tCK[ns]). The WR value in the mode register must be programmed to be equal or larger than WRmin. The programmed WR value is used with tRP to determine tDAL. 3. The table only shows the encodings for a given Cas Latency. For actual supported Cas Latency, please refer to speedbin tables for each frequency 4. The table only shows the encodings for Write Recovery. For actual Write recovery timing, please refer to AC timing table. Figure 2.3.2 — MR0 Definition 2.3.2.1 Burst Length, Type and Order Accesses within a given burst may be programmed to sequential or interleaved order. The burst type is selected via bit A3 as shown in Figure 2.3.2. The ordering of accesses within a burst is determined by the burst length, burst type, and the starting column address as shown in Table below. The burst length is defined by bits A0-A1. Burst length options include BA2 BA1 BA0 A13 A12 A11 A10 A9 A8 A7 A6 A5 A4 A3 A2 A1 A0 Address Field 0 0 0 0*1 PPD WR DLL TM CAS Latency RBT CL BL Mode Register 0 A8 DLL Reset A7 mode A3 Read Burst Type A1 A0 BL 0 No 0 Nomal 0 Nibble Sequential 0 0 8 (Fixed) 1 Yes 1 Test 1 Interleave 0 1 BC4 or 8 (on the fly) 1 0 BC4 (Fixed) A12 DLL Control for Write recovery for autoprecharge 1 1 Reserved Precharge PD A11 A10 A9 WR(cycles) 0 Slow exit (DLL off) 0 0 0 16 *2 A6 A5 A4 A2 CAS Latency 1 Fast exit (DLL on) 0 0 1 5*2 0 0 0 0 Reserved 0 1 0 6*2 0 0 1 0 5 BA1 BA0 MR Select 0 1 1 7*2 0 1 0 0 6 0 0 MR0 1 0 0 8*2 0 1 1 0 7 0 1 MR1 1 0 1 10 *2 1 0 0 0 8 1 0 MR2 1 1 0 12 *2 1 0 1 0 9 1 1 MR3 1 1 1 14 *2 1 1 0 0 10 1 1 1 0 11 0 0 0 1 12 0 0 1 1 13 0 1 0 1 14 0 1 1 1 15 1 0 0 1 16 1 0 1 1 Reserved 1 1 0 1 Reserved 1 1 1 1 Reserved |
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