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X76F640 Datasheet(PDF) 7 Page - Xicor Inc. |
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X76F640 Datasheet(HTML) 7 Page - Xicor Inc. |
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7 / 17 page  X76F640 7 Figure 5. Acknowledge Polling 8th clk. of 8th pwd. byte ‘ACK’ clk 8th clk ‘ACK’ clk ‘ACK’ START condition 8th bit ACK or no ACK SCL SDA 7025 FM 10 READ OPERATIONS Read operations are initiated in the same manner as write operations but with a different command code. Random Read The master issues the start condition and a Read instruc- tion and password, performs a Password Ack Polling, then issues the word address. Once the password has been acknowledged and first byte has been read, another start can be issued followed by a new 8-bit address. Random reads are allowed, but only the low order 8 bits can change. This limits random reads to a 256 byte block. Therefore, with a single password cycle only a 256 byte block of array 0 may be accessed randomly. To randomly access another block of array 0, a stop must be issued fol- lowed by a new command/address/password sequence. A random read of the array 1 can access all locations with- out another password command sequence. Sequential Read The host can read sequentially within an array after the password acceptance sequence. The data output is sequential, with the data from address n followed by the data from n+1. The address counter for read operations increments all address bits, allowing the entire memory array contents to be serially read during one operation. At the end of the address space (address 1FFFh for array 0, 1Fh for array 1), the counter “rolls over” to address 0 and the X76F640 continues to output data for each acknowl- edge received. Refer to figure 7 for the address, acknowl- edge and data transfer sequence. An acknowledge must follow each 8-bit data transfer. After the last bit has been read, a stop condition is generated without a preceding acknowledge. Figure 6. Random Read S Data Y S COMMAND Read Password 7 Read Password 0 S SDA Data X Wait tWC OR ACK POLLING S ACK Polling Repeated COMMAND Command If ACK, then Password Matches 7025 FM 11 |
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