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LPC47M14X bảng dữ liệu(PDF) 191 Page - SMSC Corporation |
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LPC47M14X bảng dữ liệu(HTML) 191 Page - SMSC Corporation |
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191 / 205 page  SMSC DS – LPC47M14X Page 191 Rev. 03/19/2001 FIGURE 32 – PARALLEL PORT FIFO TIMING NAME DESCRIPTION MIN TYP MAX UNITS t1 PDATA Valid to nSTROBE Active 600 ns t2 nSTROBE Active Pulse Width 600 ns t3 PDATA Hold from nSTROBE Inactive (Note 1) 450 ns t4 nSTROBE Active to BUSY Active 500 ns t5 BUSY Inactive to nSTROBE Active 680 ns t6 BUSY Inactive to PDATA Invalid (Note 1) 80 ns Note 1: The data is held until BUSY goes inactive or for time t3, whichever is longer. This only applies if another data transfer is pending. If no other data transfer is pending, the data is held indefinitely. t3 t4 t1 t2 t7 t8 t6 t5 t6 nALF PD<7:0> BUSY nSTROBE FIGURE 33 – ECP PARALLEL PORT FORWARD TIMING NAME DESCRIPTION MIN TYP MAX UNITS t1 nALF Valid to nSTROBE Asserted 0 60 ns t2 PDATA Valid to nSTROBE Asserted 0 60 ns t3 BUSY Deasserted to nALF Changed (Notes 1,2) 80 180 ns t4 BUSY Deasserted to PDATA Changed (Notes 1,2) 80 180 ns t5 nSTROBE Asserted to Busy Asserted 0 ns t6 nSTROBE Deasserted to Busy Deasserted 0 ns t7 BUSY Deasserted to nSTROBE Asserted (Notes 1,2) 80 200 ns t8 BUSY Asserted to nSTROBE Deasserted (Note 2) 80 180 ns Note 1: Maximum value only applies if there is data in the FIFO waiting to be written out. Note 2: BUSY is not considered asserted or deasserted until it is stable for a minimum of 75 to 130 ns. t3 t6 t1 t2 t5 t4 PD<7:0> nSTROBE BUSY |
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