Harman Kardon AVR354 Service Manual

Also see for AVR 354: Brochure & specs Owner's manual Quick start guide Service manual

Contents

Harman Kardon AVR354 Service Manual Manual pdf 57 page image

256M Double Data Rate Synchronous DRAMA3S56D30ETPA3S56D40ETPBASIC FUNCTIONSThe A3S56D30/40ETP provides basic functions, bank (row) activate, burst read / write, bank(row) precharge, and auto / self refresh. Each command is defined by control signals of /RAS,/CAS and /WE at CLK rising edge. In addition to 3 signals, /CS , CKE and A10 are used as chipselect, refresh option, and precharge option, respectively. To know the detailed definition ofcommands, please see the command truth table./CLKCLKChip Select : L=select, H=deselect/CSdefine basic commandsCommand/RASCommand/CASCommand/WERefresh Option @refresh commandCKEPrecharge Option @precharge or read/write commandA10Activate (ACT) [/RAS =L, /CAS =/WE =H]ACT command activates a row in an idle bank indicated by BA.Read (READ) [/RAS =H, /CAS =L, /WE =H]READ command starts burst read from the active bank indicated by BA. First output data appears after/CAS latency. When A10 =H at this command, the bank is deactivated after the burst read (auto-precharge, READA)Write (WRITE) [/RAS =H, /CAS =/WE =L]WRITE command starts burst write to the active bank indicated by BA. Total data length to be writtenis set by burst length. When A10 =H at this command, the bank is deactivated after the burst write(auto-precharge, WRITEA)Precharge (PRE) [/RAS =L, /CAS =H, /WE =L]PRE command deactivates the active bank indicated by BA. This command also terminates burst read/write operation. When A10 =H at this command, all banks are deactivated (precharge all, PREA ).Auto-Refresh (REFA) [/RAS =/CAS =L, /WE =CKE =H]REFA command starts auto-refresh cycle. Refresh address including bank address are generatedinternally. After this command, the banks are precharged automatically.117AVR354 harman/kardon

/ 60

Related manuals for Harman Kardon AVR 354