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DP8344 Datasheet(PDF) 124 Page - National Semiconductor (TI) |
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DP8344 Datasheet(HTML) 124 Page - National Semiconductor (TI) |
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124 / 184 page  50 Device Specifications (Continued) TABLE 5-25 Latched Write of IMEM (Notes 1 2) Symbol ID Parameter Formula Min Max Units tSU-RRW-CO 1 RAE REM-WR Falling before CLK-OUT Rising 24 ns tH-RRW-CO 2 RAE REM-WR Rising after CLK-OUT Rising (Note 3) THa 6ns Tab20 ns tH-RRW-X 3 RAE REM-WR Rising after XACK Rising 0 ns tSU-CMD-RRW 4 CMD Valid before RAE REM-WR Falling 0 ns tH-CMD-RRW 5 CMD Invalid after RAE REM-WR Falling Ta 26 ns tPD-RRW-X 6 RAE REM-WR Falling to XACK Falling 26 ns tAZ-AAD-LCL 7 A AD Disabled before LCL Rising TLab20 ns tZA-LCL-AAD 8 A AD Enabled after LCL Falling THab10 ns tPD-RDAT-I 9 AD (Data) Valid to I Valid 30 ns tH-RDAT-IWR 10 AD (Data) Invalid after IWR Rising 0 ns tPD-RRW-WPND 11 RAE REM-WR Rising to WR-PEND Falling 5 Ta 34 ns tPD-LCL-IA 12 LCL Falling to Next IA Valid TaTHab19 5 ns tZA-IWR-I 13 IWR Falling to I Enabled Tab2ns tAZ-IWR-I 14 IWR Rising to I Disabled 22 52 ns tPD-I-IWR 15 I Valid before IWR Rising (nIWa1)Tab18 ns tPD-LCL-IWR 16 LCL Rising to IWR Falling b 3ns tPD-IWR-LCL 17 IWR Rising to LCL Falling Tab17 ns tW-IWR 18 IWR Low Time (nIWa2)Tab12 ns tSU-CMD-WPND 19 CMD Valid before WR-PEND Rising 16 ns tH-CMD-WPND 20 CMD Invalid after WR-PEND Rising 4 ns tPD-I-IA 21 I Disabled to IA Invalid 2TaTHab70 ns tSU-RRWr-CO 22 RAE REM-WR Rising before CLK-OUT Rising 20 ns tPD-X-WPND 23 XACK Rising to WR-PEND Rising 13 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 Two remote writes to instruction memory are necessary to store a 16-bit instruction word to IMEMlow byte followed by high byte The timing of the 2nd write is shown in the following diagram The first write is the same as a write of the PC or RIC as shown in Figure 5-23 Note 3 The maximum value for this parameter is the latest RAE REM-WR can be removed without delaying the remote access by one T-state 124 |
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