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10 / 50 page 8 Am29BL162C July 8, 2005 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 it- self 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 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 resulting output. The following subsections describe each of these operations in further detail. Table 1. Device Bus Operations Legend: L = Logic Low = VIL, H = Logic High = VIH, SA = Sector Address, X = Don’t care. Notes: 1. Addresses are A19:A0. 2. The sector protect and sector unprotect functions may also be implemented via programming equipment. See the “Sector Protection/Unprotection” section. Operation CE# OE# WE# RESET# CLK LBA# BAA# Addresses (Note 1) Data (DQ0–DQ15) Read L L H H X X X AIN DOUT Write L H L H X X X AIN DIN Standby VCC ± 0.3 V XX VCC ± 0.3 V X X X X HIGH Z Output Disable L H H H X X X HIGH Z HIGH Z Reset X X X L X X X X HIGH Z Sector Protect (Note 2)L H L VID XX X Sector Address, A6 = L, A1 = H, A0 = L DIN Sector Unprotect (Note 2)L H L VID XX X Sector Address, A6 = H, A1 = H, A0 = L DIN Temporary Sector Unprotect X X X VID XX X AIN HIGH Z Burst Read Operations Load Starting Burst Address L X H H L H AIN X Advance Burst to Next Address (no data presented on the data bus) LH H H HL X HIGH Z Advance Burst to Next address (appropriate data presented on the data bus) LL H H H L X Data Out DQ0-DQ15 Terminate Current Burst Read Cycle H X H H X X X HIGH Z Terminate Current Burst Read Cycle; Start New Burst Read Cycle LX H H L H AIN X Burst Suspend (all data is retained internally in the device) L H H H X H H X HIGH Z Burst Resume (same data as Burst Suspend) LL H H H H X Data Out DQ0–DQ15 Burst Resume (incremented data from Burst Suspend) LL H H H L X Data Out DQ0–DQ15 |
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