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S29AL008D Datasheet(PDF) 11 Page - SPANSION |
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S29AL008D Datasheet(HTML) 11 Page - SPANSION |
11 / 55 page June 16, 2005 S29AL008D_00A3 S29AL008D 11 Da t a S h ee t 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 com- posed 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. Table 1 lists the device bus operations, the inputs and con- trol levels they require, and the resulting output. The following subsections describe each of these operations in further detail. 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, on page 16. Word/Byte Configuration The BYTE# pin controls whether the device data I/O pins DQ15–DQ0 operate in the byte or word configuration. If the BYTE# pin is set at logic 1, the device is in word configuration, DQ15–DQ0 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 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 BYTE# pin determines whether the device outputs array data in words or bytes. Table 1. S29AL008D Device Bus Operations 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 X X 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 X X Sector Unprotect (Note 2) L H L VID Sector Address, A6 = H, A1 = H, A0 = L DIN X X Temporary Sector Unprotect X X X VID AIN DIN DIN High-Z |
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