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Os motores de busca de Datasheet de Componentes eletrônicos |
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Os motores de busca de Datasheet de Componentes eletrônicos |
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CS89712 Folha de dados(PDF) 96 Page - Cirrus Logic |
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CS89712 Folha de dados(HTML) 96 Page - Cirrus Logic |
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96 / 170 page  CS89712 96 DS502PP2 3.9.2 SDCONF SDRAM Control Register (address 0x8000.2300) 3.9.3 SDRFPR SDRAM Refresh Period Register (address 0x8000.2340) This 16-bit read/write register sets the interval between SDRAM refresh commands. The value programmed is the interval in BLCK cycles e.g. for a 16 µs refresh period with a BCLK of 36 MHz, the following value should be used: 16x10-6 * 36x106 = 576 The refresh timer is set to 256 by nPOR to ensure a refresh time of better than 16 µs. This register should not be programmed to a value below 2 otherwise the internal bus may become locked. This register replaces DPFPR, which is no longer active. Writes to this register are ignored. Reads from this register will produce unpredictable results. 0011 04:12 1011 12:04 0100 05:11 1100 13:03 0101 06:10 1101 14:02 0110 07:09 1110 15:01 0111 08:08 1111 16:00 (continually on) 31:11 10 9 8:7 6:5 4:2 1:0 Reserved SDACTIVE CLKCTL SDWIDTH SDSIZE Reserved CASLAT Bit Description 1:0. How many clock cycles after CAS before the device is ready for reading or writing. . . ‘00’ => Reserved. . . , ‘01’ => Reserved, ‘10’ => CAS Latency = 2, ‘11’ => CAS Latency = 3. . . . . . . . . . . The default value is ‘10’ for CAS latency = 2. 4:2. Reserved. 6:5. The capacity of each SDRAM. The values are: ‘00’=>16Mits, ‘01’=>64Mbits, ‘10’=>128Mbits, ‘11’=>256Mbits. 8:7. The width of each SDRAM. ‘00’=>4bits, ‘01’=>8bits, ‘10’=>16 bits, ‘11’=>32 bits. 9. Control over the SDRAM clock. ‘0’=> SDRAM clock is permanently enabled except when in standby mode. ‘1’=>SDRAM clock stops when the CS89712 is put into inactive mode i.e., SDACTIVE = ‘0’, or when in standby mode. 10. Enables the SDRAM controller: ‘0’ disables, ‘1’ enables. The SDRAM controller will only initialize if SDACTIVE is set to 1. After initialization, resetting this parameter will cause the SDRAM con- troller to enter an inactive state. It will remain in this state until SDACTIVE is set to 1. 31:11. Reserved. 31:16 15:0 Reserved REFRATE LEDFLSH[5:2] Duty Ratio (time on: time off) LEDFLSH[5:2] Duty Ratio (time on: time off) Table 50. LED Duty Ratio (Continued) |
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