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DP8344 Datasheet(PDF) 110 Page - National Semiconductor (TI) |
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DP8344 Datasheet(HTML) 110 Page - National Semiconductor (TI) |
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110 / 184 page  50 Device Specifications (Continued) TABLE 5-13 Buffered Read of IMEM (Note 1) Symbol ID Parameter Formula Min Max Units tSU-RRR-CO 1 RAE REM-RD Falling before CLK-OUT Rising 22 ns tH-RRR-X 2 RAE REM-RD Rising after XACK Rising (Note 2) 0 ns Tab32 ns tSU-CMD-RRR 3 CMD Valid before RAE REM-RD Falling 0 ns tH-CMD-RRR 4 CMD Invalid after RAE REM-RD Falling Ta 26 ns tPD-RRR-X 5 RAE REM-RD Falling to XACK Falling 26 ns tPD-X-LCL 6 XACK Falling to LCL Rising Tab5ns tPD-LCL-X 7 LCL Rising to XACK Rising (nIWa2)Tab10 8 ns tPD-RRR-LCL 8 RAE REM-RD Rising to LCL Falling 3 ns tAZ-LCL-A 9 A Disabled after LCL Rising TLab18 ns tZA-A-LCL 10 A Enabled before LCL Falling THa 15 ns tPD-IMEM-X 11 AD (IMEM) Valid before XACK Rising (nIWa1)Tab25 ns tPD-RRR-IMEM 12 AD (IMEM) Invalid after RAE REM-RD Rising 10 ns tPD-LCL-IMEM 13 LCL Rising to AD (IMEM) Valid Ta 22 ns tW-IMEM 14 (IMEM) Valid (nIWa1)Ta 0ns tPD-LCL-IA 15 LCL Falling to Next IA Valid (Note 3) THa 8ns TaTHa 44 ns Note 1 All parameters are individually tested and guaranteed Interpreting this data by numerically adding two or more parameters to create a new timing specification may lead to invalid results Note 2 The maximum value for this parameter is the latest RAE REM-RD can be removed without adding a T-state to the remote access Note 3 Two remote reads from instruction memory are necessary to read a 16-bit instruction word from IMEMlow byte followed by high byte The timing for the two reads are the same except that IA is incremented after the high instruction memory byte is read TLF9336 – 67 FIGURE 5-13 Buffered Read of IMEM 110 |
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