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EPCS4SI8N Datasheet(PDF) 10 Page - Altera Corporation |
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EPCS4SI8N Datasheet(HTML) 10 Page - Altera Corporation |
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10 / 32 page  4–10 Core Version a.b.c variable Altera Corporation Configuration Handbook, Volume 2 July 2004 Serial Configuration Device Memory Access Operation Codes This section describes the operations that can be used to access the memory in serial configuration devices. The DATA, DCLK, ASDI, and nCS signals access to the memory in serial configuration devices. All serial configuration device operation codes, addresses and data are shifted in and out of the device serially, with the most significant bit (MSB) first. The device samples the active serial data input on the first rising edge of the DCLK after the active low chip select (nCS) input signal is driven low. Shift the operation code (MSB first) serially into the serial configuration device through the active serial data input pin. Each operation code bit is latched into the serial configuration device on the rising edge of the DCLK. Different operations require a different sequence of inputs. While executing an operation, you must shift in the desired operation code, followed by the address bytes, data bytes, both, or neither. The device must drive nCS high after the last bit of the operation sequence is shifted in. Table 4–8 shows the operation sequence for every operation supported by the serial configuration devices. For the read byte, read status, and read silicon ID operations, the shifted- in operation sequence is followed by data shifted out on the DATA pin. You can drive the nCS pin high after any bit of the data-out sequence is shifted out. For the write byte, erase bulk, erase sector, write enable, write disable, and write status operations, drive the nCS pin high exactly at a byte boundary (drive the nCS pin high a multiple of eight clock pulses after the nCS pin was driven low). Otherwise, the operation is rejected and will not be executed. Table 4–7. Address Range for Sectors in EPCS1 Devices Sector Address Range (Byte Addresses in HEX) Start End 3 H'18000 H'1FFFF 2 H'10000 H'17FFF 1 H'08000 H'0FFFF 0 H'00000 H'07FFF |
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