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AM29DL640D35WHK Folha de dados(PDF) 10 Page - Advanced Micro Devices |
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AM29DL640D35WHK Folha de dados(HTML) 10 Page - Advanced Micro Devices |
10 / 54 page 8 Am29DL640D December 13, 2005 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 la tch used to 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 ma- chine. 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 re- sulting output. The following subsections describe each of these operations in further detail. Table 1. Am29DL640D Device Bus Operations Legend: L = Logic Low = V IL, H = Logic High = VIH, VID = 8.5–12.5 V, VHH = 9.0 ± 0.5 V, X = Don’t Care, SA = Sector Address, A IN = Address In, DIN = Data In, DOUT = Data Out Notes: 1. Addresses are A21:A0 in word mode (BYTE# = V IH), A21: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/Sector Block Protection and Unprotection section. 3. If WP#/ACC = V IL, sectors 0, 1, 140, and 141 remain protected. If WP#/ACC = VIH, protection on sectors 0, 1, 140, and 141 depends on whether they were last protected or unprotected using the method described in Sector/Sector Block Protection and Unprotection. If WP#/ACC = V HH, all sectors are unprotected. 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 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 memory content occurs during the power transition. No com- mand is necessary in this mode to obtain array data. Standard microprocessor read cycles that assert valid 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 D IN D IN 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 D IN XX Sector Unprotect (Note 2)L H L V ID (Note 3) SA, A6 = H, A1 = H, A0 = L D IN XX Temporary Sector Unprotect XX X V ID (Note 3)A IN D IN D IN High-Z |
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