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W97AH6KB Datasheet(PDF) 75 Page - Winbond |
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W97AH6KB Datasheet(HTML) 75 Page - Winbond |
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75 / 127 page  W97AH6KB / W97AH2KB Publication Release Date: May 15, 2014 Revision: A01-001 - 75 - 7.5.3 Current State Bank n - Command to Bank n Truth Table Current State Command Operation Next State Notes Any NOP Continue previous operation Current State Idle ACTIVATE Select and activate row Active Refresh (Per Bank) Begin to refresh Refreshing(Per Bank) 6 Refresh (All Bank) Begin to refresh Refreshing(All Bank) 7 MRW Load value to Mode Register MR Writing 7 MRR Read value from Mode Register Idle MR Reading Reset Begin Device Auto-Initialization Resetting 7, 8 Precharge Deactivate row in bank or banks Precharging 9, 15 Row Active Read Select column, and start read burst Reading Write Select column, and start write burst Writing MRR Read value from Mode Register Active MR Reading Precharge Deactivate row in bank or banks Precharging 9 Reading Read Select column, and start new read burst Reading 10, 11 Write Select column, and start write burst Writing 10, 11, 12 BST Read burst terminate Active 13 Writing Write Select column, and start new write burst Writing 10, 11 Read Select column, and start read burst Reading 10, 11, 14 BST Write burst terminate Active 13 Power On Reset Begin Device Auto-Initialization Resetting 7, 9 Resetting MRR Read value from Mode Register Resetting MR Reading Notes: 1. The table applies when both CKEn-1 and CKEn are HIGH, and after tXSR or tXP has been met if the previous state was Power Down. 2. All states and sequences not shown are illegal or reserved. 3. Current State Definitions: Idle: The bank or banks have been precharged, and tRP has been met. Active: A row in the bank has been activated, and tRCD has been met. No data bursts / accesses and no register accessesare in progress. Reading: A Read burst has been initiated, with Auto Precharge disabled, and has not yet terminated or been terminated. Writing: A Write burst has been initiated, with Auto Precharge disabled, and has not yet terminated or been terminated. 4. The following states must not be interrupted by a command issued to the same bank. NOP commands or allowable commands to the other bank should be issued on any clock edge occurring during these states. Allowable commands to the other banks are determined by its current state and 7.5.3 “Current State Bank n - Command to Bank n Truth Table”, and according to 7.5.4 “Current State Bank n - Command to Bank m Truth Table ”. Precharging: starts with the registration of a Precharge command and ends when tRP is met. Once tRP is met, the bank will be in the idle state. Row Activating: starts with registration of an Activate command and ends when tRCD is met. Once tRCD is met, the bank will be in the ‘Active’ state. Read with AP Enabled: starts with the registration of the Read command with Auto Precharge enabled and ends when tRP has been met. Once tRP has been met, the bank will be in the idle state. Write with AP Enabled: starts with registration of a Write command with Auto Precharge enabled and ends when tRP has been met. Once tRP is met, the bank will be in the idle state. |
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