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L320DB90VC 데이터시트(PDF) 12 Page - Advanced Micro Devices |
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L320DB90VC 데이터시트(HTML) 12 Page - Advanced Micro Devices |
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12 / 57 page ![]() 10 Am29LV320D December 14, 2005 DA TA SH EET 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 loca- tion. The register is a latch used to store the com- mands, 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. Table 1 lists the device bus operations, the in- puts and control levels they require, and the resulting output. The following subsections describe each of these operations in further detail. Table 1. Am29LV320D Device Bus Operations Legend: L = Logic Low = V IL, H = Logic High = VIH, VID = 11.5–12.5 V, VHH = 11.5–12.5 V, X = Don’t Care, SA = Sector Address, A IN = Address In, DIN = Data In, DOUT = Data Out Notes: 1. Addresses are A20:A0 in word mode (BYTE# = V IH), A20:A-1 in byte mode (BYTE# = VIL). 2. The sector protect and sector unprotect functions may also be implemented via programming equipment. See “Sector/Sector Block Protection and Unprotection” on page 17. 3. If WP#/ACC = V IL, 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” on page 17. If WP#/ACC = V HH, all sectors are unprotected. 4. D IN or DOUT as required by command sequence, data polling, or sector protection algorithm. Operation CE# OE# WE# RESET# WP#/ACC Addresses (Note 2) DQ0– DQ7 DQ8–DQ15 BYTE# = V IH BYTE# = V IL Read L L H H L/H A IN D OUT D OUT DQ8–DQ14 = High-Z, DQ15 = A-1 Write L H L H (Note 3) A IN (Note 4) (Note 4) Accelerated Program L H L H V HH A IN (Note 4) (Note 4) Standby V CC ± 0.3 V XX V CC ± 0.3 V H X High-Z High-Z High-Z Output Disable L H H H L/H X High-Z High-Z High-Z Reset X X X L L/H X High-Z High-Z High-Z Sector Protect (Note 2) L H L V ID L/H SA, A6 = L, A1 = H, A0 = L (Note 4) X X Sector Unprotect (Note 2) LH L V ID (Note 3) SA, A6 = H, A1 = H, A0 = L (Note 4) X X Temporary Sector Unprotect XX X V ID (Note 3) A IN (Note 4) (Note 4) High-Z |
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