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KM416RD8AS-RBM80 Datasheet(PDF) 28 Page - Samsung semiconductor |
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KM416RD8AS-RBM80 Datasheet(HTML) 28 Page - Samsung semiconductor |
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28 / 64 page  Page 25 KM416RD8AS Direct RDRAM™ Rev. 0.9 July 1999 Target The second bubble type tCBUB2 is inserted (as a NOCOP command) by the controller between a WR and RD command on the COL pins when there is a WR-WR-RD sequence to the same device. This bubble enables write data to be retired from the write buffer without being lost, and is explained in detail in Figure 18. There would be no bubble if address c0 and address d0 were directed to different devices. This bubble appears on the DQA and DQB pins as tDBUB2 between a write data dualoct D and read data dualoct Q. This bubble also appears on the ROW pins as tRBUB2. Figure 21: Interleaved Read Transaction with Two Dualoct Data Length CTM/CFM DQA7..0 DQB7..0 COL4 ..COL0 ROW2 ..ROW0 T0 T4 T8 T12 T1 T5 T9 T13 T2 T6 T10 T14 T3 T7 T11 T15 T16 T20 T24 T28 T17 T21 T25 T29 T18 T22 T26 T30 T19 T23 T27 T31 T32 T36 T40 T44 T33 T37 T41 T45 T34 T38 T42 T46 T35 T39 T43 T47 ACT a0 PREX b3 RD c2 RD c1 RD b1 RD b2 PREX a3 ACT b0 ACT c0 ACT d0 ACT e0 RD a1 RD a2 PREX z3 RD d1 ACT f0 RDd2 PREX c3 RD e1 RD e2 PREX d3 RD z1 RD z2 PREX y3 Q (b2) Q (b1) Q (a2) Q (a1) Q (c1) Q (c2) Q (d1) Q (z2) Q (z1) Q (x2) Q (y1) Q (y2) tRCD tCAC Transaction e can use the same bank as transaction a tRC tRR f3 = {Da,Ba+2} Transaction f: RD f0 = {Da,Ba+2,Rf} f1 = {Da,Ba+2,Cf1} f2= {Da,Ba+2,Cf2} e3 = {Da,Ba} Transaction e: RD e0 = {Da,Ba,Re} e1 = {Da,Ba,Ce1} e2= {Da,Ba,Ce2} d3 = {Da,Ba+6} Transaction d: RD d0 = {Da,Ba+6,Rd} d1 = {Da,Ba+6,Cd1} d2= {Da,Ba+6,Cd2} c3 = {Da,Ba+4} Transaction c: RD c0 = {Da,Ba+4,Rc} c1 = {Da,Ba+4,Cc1} c2= {Da,Ba+4,Cc2} b3 = {Da,Ba+2} Transaction b: RD b0 = {Da,Ba+2,Rb} b1 = {Da,Ba+2,Cb1} b2= {Da,Ba+2,Cb2} a3 = {Da,Ba} Transaction a: RD a0 = {Da,Ba,Ra} a1 = {Da,Ba,Ca1} a2= {Da,Ba,Ca2} z3 = {Da,Ba+6} Transaction z: RD z0 = {Da,Ba+6,Rz} z1 = {Da,Ba+6,Cz1} z2= {Da,Ba+6,Cz2} y3 = {Da,Ba+4} Transaction y: RD y0 = {Da,Ba+4,Ry} y1 = {Da,Ba+4,Cy1} y2= {Da,Ba+4,Cy2} Figure 22: Interleaved RRWW Sequence with Two Dualoct Data Length CTM/CFM DQA7..0 DQB7..0 COL4 ..COL0 ROW2 ..ROW0 T0 T4 T8 T12 T1 T5 T9 T13 T2 T6 T10 T14 T3 T7 T11 T15 T16 T20 T24 T28 T17 T21 T25 T29 T18 T22 T26 T30 T19 T23 T27 T31 T32 T36 T40 T44 T33 T37 T41 T45 T34 T38 T42 T46 T35 T39 T43 T47 ACT a0 MSK (b2) WRA c2 MSK (b1) WR c1 WR b1 MSK (y2) WRA b2 PREX a3 D (b2) D (b1) ACT b0 ACT c0 ACT d0 ACT e0 RD a1 RD a2 PREX z3 Q (a2) Q (a1) MSK (c1) D (c1) NOCOP MSK (c2) RDd0 D (c2) tRBUB1 RDf1 Q (z2) Q (z1) D (y2) RD z1 RD z2 tCBUB1 tDBUB1 tDBUB1 tDBUB2 tCBUB2 tRBUB2 tCBUB2 NOCOP Transaction e can use the same bank as transaction a f3 = {Da,Ba+2} Transaction f: WR f0 = {Da,Ba+2,Rf} f1 = {Da,Ba+2,Cf1} f2= {Da,Ba+2,Cf2} e3 = {Da,Ba} Transaction e: RD e0 = {Da,Ba,Re} e1 = {Da,Ba,Ce1} e2= {Da,Ba,Ce2} d3 = {Da,Ba+6} Transaction d: RD d0 = {Da,Ba+6,Rd} d1 = {Da,Ba+6,Cd1} d2= {Da,Ba+6,Cd2} c3 = {Da,Ba+4} Transaction c: WR c0 = {Da,Ba+4,Rc} c1 = {Da,Ba+4,Cc1} c2= {Da,Ba+4,Cc2} b3 = {Da,Ba+2} Transaction b: WR b0 = {Da,Ba+2,Rb} b1 = {Da,Ba+2,Cb1} b2= {Da,Ba+2,Cb2} a3 = {Da,Ba} Transaction a: RD a0 = {Da,Ba,Ra} a1 = {Da,Ba,Ca1} a2= {Da,Ba,Ca2} z3 = {Da,Ba+6} Transaction z: RD z0 = {Da,Ba+6,Rz} z1 = {Da,Ba+6,Cz1} z2= {Da,Ba+6,Cz2} y3 = {Da,Ba+4} Transaction y: WR y0 = {Da,Ba+4,Ry} y1 = {Da,Ba+4,Cy1} y2= {Da,Ba+4,Cy2} |
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