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IS93C66-3 Datasheet(PDF) 3 Page - Integrated Silicon Solution, Inc |
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IS93C66-3 Datasheet(HTML) 3 Page - Integrated Silicon Solution, Inc |
3 / 10 page Integrated Silicon Solution, Inc. — 1-800-379-4774 3 Rev. G 04/26/01 IS93C66-3 ISSI® As with the WRITE instruction, if CS is brought HIGH after a minimum wait of 250 ns (tCS), the DOUT pin indicates the READY/ BUSY status of the chip (see Figure 6). W rite Disable (WDS) The write disable (WDS) instruction disables all programming capabilities. This protects the entire part against accidental modification of data until a WEN instruction is executed. (When Vcc is applied, this part powers up in the write disabled state.) To protect data, a WDS instruction should be executed upon completion of each programming operation. (NOTE: Neither the WEN nor the WDS instruction has any effect on the READ instruction.) (See Figure 7.) Erase Register (ERASE) After the erase instruction is entered, CS must be brought LOW. The falling edge of CS initiates the self-timed internal programming cycle. Bringing CS HIGH after a minimum of tCS, will cause DOUT to indicate the READ/ BUSY status of the chip: a logical “0” indicates programming is still in progress; a logical “1” indicates the erase cycle is complete and the part is ready for another instruction (see Figure 8). Erase All (ERAL) Full chip erase is provided for ease of programming. Erasing the entire chip involves setting all bits in the entire memory array to a logical “1” (see Figure 9). remains in a write disabled state until a WEN instruction is executed. Thereafter, the device remains enabled until a WDS instruction is executed or until Vcc is removed. (NOTE: Neither the WEN nor the WDS instruction has any effect on the READ instruction.) (See Figure 4.) Write (WRITE) The WRITE instruction includes 16 bits of data to be written into the specified register. After the last data bit has been applied to DIN, and before the next rising edge of SK, CS must be brought LOW. The falling edge of CS initiates the self-timed programming cycle. After a minimum wait of 250 ns (5V operation) from the falling edge of CS (tCS), if CS is brought HIGH, DOUT will indicate the READY/ BUSY status of the chip: logical “0” means programming is still in progress; logical “1” means the selected register has been written, and the part is ready for another instruction (see Figure 5). (NOTE: The combination of CS HIGH, DIN HIGH and the rising edge of the SK clock, resets the READY/ BUSY flag. Therefore, it is important if you want to access the READY/ BUSY flag not to reset it through this combination of control signals.) Before a WRITE instruction can be executed, the device must be write enabled (see WEN). Write All (WRALL) The write all (WRALL) instruction programs all registers with the data pattern specified in the instruction. While the WRALL instruction is being loaded, the address field becomes a sequence of “Don’t Care” bits (see Figure 6). INSTRUCTION SET Instruction Start Bit OP Code Address Input Data READ 1 10 (A7-A0) WEN 1 00 11XXXXXX (Write Enable) WRITE 1 01 (A7-A0) D15-D0(1) WRALL 1 00 01XXXXXX D15-D0(1) (Write All Registers) WDS 1 00 00XXXXXX (Write Disable) ERASE 1 11 (A7-A0) ERAL 1 00 10XXXXXX (Erase All Registers) Note: 1. If input data is not 16 bits exactly, the last 16 bits will be taken as input data (a word). |
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