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A82DL1644UG-70I Datasheet(PDF) 9 Page - AMIC Technology |
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A82DL1644UG-70I Datasheet(HTML) 9 Page - AMIC Technology |
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9 / 57 page  A82DL16x4T(U) Series PRELIMINARY (August, 2005, Version 0.0) 8 AMIC Technology, Corp. DEVICE BUS OPERATIONS This section describes the requirements and use of the device bus operations, which are initiated through the internal command register. The command register itself does not occupy any addressable memory location. The register is composed of latches that store the commands, along with the address and data information needed to execute the command. The contents of the register serve as inputs to the internal state machine. The state machine outputs dictate the function of the device. The appropriate device bus operations table lists the inputs and control levels required, and the resulting output. The following subsections describe each of these operations in further detail. Table 1-1. Device Bus Operations – Flash Byte Mode ( BYTE_F = VIH) Operation (Notes 1, 2) CE_F E1_S C CE2_S OE WE A0- A19 LB_S (Note3) UB_S (Note3) RESET WP /ACC (Note 4) I/O7– I/O0 I/O15– I/O0 H X Read from Flash L X L L H AIN X X H L/H IOUT IOUT H X Write to Flash L X L H L AIN X X H (Note 4) IIN IIN H X Standby VCC ± 0.3 V X L X X X X X VCC ± 0.3 V H High-Z High-Z L X Output Disable L L H H H X X L H L/H High-Z High-Z H X X L Flash Hardware Reset X H X X X X X X L L/H High-Z High-Z X L Sector Protect (Notes) L H X H L SA, A6 = L, A1 = H, A0 = L X X VID L/H IIN X Sector Unprotect (Note 5) L X L H L SA, A6 = H, A1 = H, A0 = L X X VID (Note 6) IIN X H X IIN High-Z Temporary Sector Unprotect X X L X X AIN X X VID (Note 6) IOUT IOUT H L High-Z IOUT L H IOUT High-Z Read from SRAM H L H L H AIN L L H X IIN IIN H L High-Z IIN Write to SRAM H L H X L AIN L H H X IIN High-Z Legend: L = Logic Low = VIL, H = Logic High = VIH, VID = 8.5–12.5 V, VHH = 9.0 ± 0.5 V, X = Don’t Care, SA = Sector Address, AIN = Address In, IIN = Data In, IOUT = Data Out Notes: 1.Other operations except for those indicated in this column are inhibited. 2.Do not apply CE_F = VIL, CE1_S = VIL and CE2_S = VIH at the same time. 3.Don’t care or open LB_S or UB_S . 4.The sector protect and sector unprotect functions may also be implemented via programming equipment. See the “Sector/Sector Block Protection and Unprotection” section. 5. If WP /ACC = VIL, the two outermost boot sectors remain protected. If WP /ACC = VIH, the two outermost boot sector protection depends on whether they were last protected or unprotected using the method described in “Sector/Sector Block Protection and Unprotection”. If WP /ACC = VHH, all sectors will be unprotected. |
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