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EPCS1 数据表(PDF) 23 Page - Altera Corporation |
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EPCS1 数据表(HTML) 23 Page - Altera Corporation |
23 / 32 page Altera Corporation Core Version a.b.c variable 4–23 July 2004 Configuration Handbook, Volume 2 Serial Configuration Devices (EPCS1, EPCS4, EPCS16 & EPCS64) Data Sheet The erase sector operation is implemented by first driving nCS low, then shifting in the erase sector operation code and the three address bytes of the chosen sector on the ASDI pin. The three address bytes for the erase sector operation can be any address inside the specified sector. (See Tables 4–6 and 4–7 for sector address range information.) Drive nCS high after the eighth bit of the erase sector operation code has been latched in. Figure 4–15 shows the timing diagram. Immediately after the device drives nCS high, the self-timed erase sector cycle is initiated. The self-timed erase sector cycle usually takes 2 s for EPCS1 and EPCS4 devices and is guaranteed to be less than 3 s for both serial configuration devices. You must account for this amount of delay before the memory contents can be accessed. Alternatively, you can check the write in progress bit in the status register by executing the read status operation while the erase cycle is in progress. The write in progress bit is 1 during the self-timed erase cycle and is 0 when it is complete. The write enable latch bit in the status register is reset to 0 before the erase cycle is complete. Figure 4–15. Erase Sector Operation Timing Diagram Power & Operation This section describes the power modes, power-on reset (POR) delay, error detection, and initial programming state of serial configuration devices. Power Mode Serial configuration devices support active power and standby power modes. When nCS is low, the device is enabled and is in active power mode. The FPGA is configured while in active power mode. When nCS is high, the device is disabled but could remain in active power mode until all internal cycles have completed (such as write or erase operations). The serial configuration device then goes into stand-by power mode. The ICC1 nCS DCLK ASDI 01234567 8 9 28 29 30 31 Operation Code 24-Bit Address 23 22 3 2 1 0 MSB |
类似零件编号 - EPCS1 |
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类似说明 - EPCS1 |
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