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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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MPC821 датащи(PDF) 40 Page - NXP Semiconductors |
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MPC821 датащи(HTML) 40 Page - NXP Semiconductors |
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40 / 242 page  Functional Description MPC8XXFADS Design Specification—Rev 0.1 PRELIMINARY—SUBJECT TO CHANGE WITHOUT NOTICE FIGURE 4-4 SDRAM Connection Scheme 4•8•1 SDRAM Programming After power-up, the sdram needs to be initialized by means of programming, to establish its mode of operation. Sdram is programmed by issuing a Mode Register Set command. During that command data is passed to the Mode Register through the sdram’s address lines. This command is fully sup- ported by the UPM by means of a dedicated Memory Address Register and a UPM command run option. Mode Register programming values are shown in TABLE 4-7. "SDRAM’s Mode Register Program- CS RAS CAS W A11 A10 A(9:8) A(7:0) CKE CLK DQMU DQML DQ(15:0) CS RAS CAS W A11 A10 A(9:8) A(7:0) CKE CLK DQMU DQML DQ(15:0) CS4 GPL1 GPL2 GPL3 GPL0 SDRAMEN SYSCLK D(0:15) D(16:31) BS0_B BS1_B BS2_B BS3_B A(22:29) A(20:21) A10 (A11) Freescale Semiconductor, Inc. For More Information On This Product, Go to: www.freescale.com |
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