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A48P4616B Datasheet(PDF) 11 Page - AMIC Technology |
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A48P4616B Datasheet(HTML) 11 Page - AMIC Technology |
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11 / 66 page  A48P4616B (January, 2014, Version 1.0) 10 AMIC Technology, Corp. Commands Truth Tables 1a and 1b provide a reference of the commands supported by DDR SDRAM device. A verbal description of each command follows. Name (Function) CS RAS CAS WE Address MNE Note Deselect (Nop) H X X X X NOP 1, 9 No Operation (Nop) L H H H X NOP 1, 9 Active (Select Bank And Activate Row) L L H H Bank/Row ACT 1, 3 Read (Select Bank And Activate Column, And Start Read Burst) L H L H Bank/Col Read 1, 4 Write (Select Bank And Activate Column, And Start Write Burst) L H L L Bank/Col Write 1, 4 Burst Terminate L H H L X BST 1, 8 Precharge (Deactivate Row In Bank Or Banks) L L H L Code PRE 1, 5 Auto Refresh Or Self Refresh (Enter Self Refresh Mode) L L L H X AR/SR 1, 6, 7 Mode Register Set L L L L Op-Code MRS 1, 2 Note: 1. CKE is high for all commands shown except Self Refresh. 2. BA0, BA1 select either the Base or the Extended Mode Register (BA0 = 0, BA1 = 0 selects Mode Register; BA0 = 1, BA1 = 0 selects Extended Mode Register; other combinations of BA0-BA1 are reserved; A0-A12 provide the op-code to be written to the selected Mode Register.) 3. BA0-BA1 provide bank address and A0-A12 provide row address. 4. BA0, BA1 provide bank address; A0-A8 provide column address; A10 high enables the Auto Precharge feature (non- persistent), A10 low disables the Auto Precharge feature. 5. A10 LOW: BA0, BA1 determine which bank is precharged. A10 HIGH: all banks are precharged and BA0, BA1 are “Don’t Care.” 6. This command is auto refresh if CKE is high; Self Refresh if CKE is low. 7. Internal refresh counter controls row and bank addressing; all inputs and I/Os are “Don’t Care” except for CKE. 8. Applies only to read bursts with Auto Precharge disabled; this command is undefined (and should not be used) for read bursts with Auto Precharge enabled or for write bursts 9. Deselect and NOP are functionally interchangeable. Truth Table 1b: DM Operation Name (Function) DM DQs Note Write Enable L Valid 1 Write Inhibit H X 1 Note: Used to mask write data; provided coincident with the corresponding data. |
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