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AM29LV004BB-70FI Datasheet(PDF) 9 Page - Advanced Micro Devices |
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AM29LV004BB-70FI Datasheet(HTML) 9 Page - Advanced Micro Devices |
9 / 40 page 8 Am29LV004B 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 composed of latches that store the commands, along with the address and data informa- tion needed to execute the command. The contents of the register serve as inputs to the internal state machine. The state machine outputs dictate the func- tion of the device. Table 1 lists the device bus operations, the inputs and control levels they require, and the resulting output. The following subsections describe each of these operations in further detail. Table 1. Am29LV004B Device Bus Operations Legend: L = Logic Low = VIL, H = Logic High = VIH, VID = 12.0 ± 0.5 V, X = Don’t Care, AIN = Address In, DIN = Data In, DOUT = Data Out Notes: 1. Addresses are A18–A0. 2. The sector protect and sector unprotect functions may also be implemented via programming equipment. See the “Sector Protection/Unprotection” section. Requirements for Reading Array Data To read array data from the outputs, the system must drive the CE# and OE# pins to VIL. CE# is the power control and selects the device. OE# is the output control and gates array data to the output pins. WE# should remain at VIH. The internal state machine is set for reading array data upon device power-up, or after a hardware reset. This ensures that no spurious alteration of the memory content occurs during the power transition. No command is necessary in this mode to obtain array data. Standard microprocessor read cycles that assert valid addresses on the device address inputs produce valid data on the device data outputs. The device remains enabled for read access until the command register contents are altered. See “Reading Array Data” for more information. Refer to the AC Read Operations table for timing specifica- tions and to Figure 13 for the timing diagram. ICC1 in the DC Characteristics table represents the active current specification for reading array data. Writing Commands/Command Sequences To write a command or command sequence (which includes programming data to the device and erasing sectors of memory), the system must drive WE# and CE# to VIL, and OE# to VIH. The device features an Unlock Bypass mode to facili- tate faster programming. Once the device enters the Unlock Bypass mode, only two write cycles are required to program a byte, instead of four. The “Byte Program Command Sequence” section has details on programming data to the device using both standard and Unlock Bypass command sequences. An erase operation can erase one sector, multiple sec- tors, or the entire device. Tables 2 and 3 indicate the address space that each sector occupies. A “sector address” consists of the address bits required to uniquely select a sector. The “Command Definitions” section has details on erasing a sector or the entire chip, or suspending/resuming the erase operation. After the system writes the autoselect command sequence, the device enters the autoselect mode. The system can then read autoselect codes from the Operation CE# OE# WE# RESET# Addresses (Note 1) DQ0–DQ7 Read L L H H AIN DOUT Write L H L H AIN DIN Standby VCC ± 0.3 V X X VCC ± 0.3 V X High-Z Output Disable L H H H X High-Z Reset X X X L X High-Z Sector Protect (Note 2) L H L VID Sector Address, A6 = L, A1 = H, A0 = L DIN, DOUT Sector Unprotect (Note 2) L H L VID Sector Address, A6 = H, A1 = H, A0 = L DIN, DOUT Temporary Sector Unprotect X X X VID AIN DIN |
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