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AM29LV800B Datasheet(PDF) 8 Page - Advanced Micro Devices |
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AM29LV800B Datasheet(HTML) 8 Page - Advanced Micro Devices |
8 / 42 page ![]() 8 Am29LV800B P R E L I M I NARY 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 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 inputs and control levels they require, and the resulting output. The following subsections describe each of these operations in further detail. Table 1. Am29LV800B 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 in word mode (BYTE# = VIH), A18:A-1 in byte mode (BYTE# = VIL). 2. The sector protect and sector unprotect functions may also be implemented via programming equipment. See the “Sector Protection/Unprotection” section. Word/Byte Configuration The BYTE# pin controls whether the device data I/O pins DQ15–DQ0 operate in the byte or word configura- tion. If the BYTE# pin is set at logic ‘1’, the device is in word configuration, DQ15–DQ0 are active and control- led 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 ac- tive 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 VIL. 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 VIH. The BYTE# pin determines whether the device outputs array data in words or bytes. 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 mem- ory content occurs during the power transition. No command is necessary in this mode to obtain array data. Standard microprocessor read cycles that as- sert valid addresses on the device address inputs pro- duce valid data on the device data outputs. The device remains enabled for read access until the com- mand 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 cur- rent specification for reading array data. Operation CE# OE# WE# RESET# Addresses (Note 1) DQ0– DQ7 DQ8–DQ15 BYTE# = VIH BYTE# = VIL Read L L H H AIN DOUT DOUT DQ8–DQ14 = High-Z, DQ15 = A-1 Write L H L H AIN DIN DIN Standby VCC ± 0.3 V XX VCC ± 0.3 V X High-Z High-Z High-Z Output Disable L H H H X High-Z High-Z High-Z Reset X X X L X High-Z High-Z High-Z Sector Protect (Note 2) L H L VID Sector Address, A6 = L, A1 = H, A0 = L DIN XX Sector Unprotect (Note 2) L H L VID Sector Address, A6 = H, A1 = H, A0 = L DIN XX Temporary Sector Unprotect X X X VID AIN DIN DIN High-Z |
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