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AM29LV320MB120RPCI 데이터시트(PDF) 10 Page - Advanced Micro Devices |
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AM29LV320MB120RPCI 데이터시트(HTML) 10 Page - Advanced Micro Devices |
10 / 61 page 10 Am29LV320MT/B May 16, 2003 DA T A 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. 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; A20:A-1 in byte mode. Sector addresses are A20:A12 in both modes. 2. The sector protect and sector unprotect functions may also be implemented via programming equipment. See the “Sector Group Protection and Unprotection” section. 3. If WP# = V IL, the first or last sector remains protected. If WP# = VIH, the top two or bottom two sectors will be protected or unprotected as determined by the method described in “Sector Group Protection and Unprotection”. All sectors are unprotected when shipped from the factory (The SecSi Sector may be factory protected depending on version ordered.) 4. D IN or DOUT as required by command sequence, data polling, or sector protect algorithm (see Figure 2). Word/Byte Configuration The BYTE# pin controls whether the device data I/O pins operate in the byte or word configuration. If the BYTE# pin is set at logic ‘1’, the device is in word con- figuration, DQ0–DQ15 are active and controlled by CE# and OE#. If the BYTE# pin is set at logic ‘0’, the device is in byte configuration, and only data I/O pins DQ0–DQ7 are active and controlled by CE# and OE#. The data I/O pins DQ8–DQ14 are tri-stated, and the DQ15 pin is used as an input for the LSB (A-1) address function. Requirements for Reading Array Data To read array data from the outputs, the system must drive the CE# and OE# pins to V IL. CE# is the power control and selects the device. OE# is the output con- trol and gates array data to the output pins. WE# should remain at V IH. 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 XX AIN D OUT D OUT DQ8–DQ14 = High-Z, DQ15 = A-1 Write (Program/Erase) L H L H (Note 3) X AIN (Note 4) (Note 4) Accelerated Program L H L H (Note 3) V HH AIN (Note 4) (Note 4) Standby VCC ± 0.3 V XX VCC ± 0.3 V XH X High-Z High-Z High-Z Output Disable L H H H XX X High-Z High-Z High-Z Reset X X X L XX X High-Z High-Z High-Z Sector Group Protect (Note 2) LH L VID HX SA, A6 =L, A3=L, A2=L, A1=H, A0=L (Note 4) X X Sector Group Unprotect (Note 2) LH L VID HX SA, A6=H, A3=L, A2=L, A1=H, A0=L (Note 4) X X Temporary Sector Group Unprotect XX X VID HX AIN (Note 4) (Note 4) High-Z |
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