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X76F128LE Datasheet(PDF) 7 Page - Xicor Inc. |
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X76F128LE Datasheet(HTML) 7 Page - Xicor Inc. |
7 / 17 page X76F128 7 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 512 byte block. Therefore, with a single password cycle only a 512 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 3FFFh for array 0, 3Fh for array 1), the counter “rolls over” to address 0 and the X76F128 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 7052 FM 11 Figure 7. Sequential Read Data X S COMMAND Read Password 7 Read Password 0 S SDA Data 0 If ACK, then Wait tWC OR ACK POLLING S ACK Polling Repeated COMMAND Command Password Matches 7052 FM 12 |
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