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24LC08BIST Datasheet(PDF) 7 Page - Microchip Technology |
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24LC08BIST Datasheet(HTML) 7 Page - Microchip Technology |
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7 / 30 page  © 2009 Microchip Technology Inc. DS21710J-page 7 24AA08/24LC08B 5.0 DEVICE ADDRESSING A control byte is the first byte received following the Start condition from the master device (Figure 5-1). The control byte consists of a four-bit control code. For the 24XX08, this is set as ‘1010 ’ binary for read and write operations. The next three bits of the control byte are the block-select bits (B2, B1, B0). B2 is a “don’t care” for the 24XX08. They are used by the master device to select which of the four 256 word-blocks of memory are to be accessed. These bits are in effect the three Most Significant bits of the word address. The last bit of the control byte defines the operation to be performed. When set to ‘1’ a read operation is selected. When set to ‘0’ a write operation is selected. Following the Start condition, the 24XX08 monitors the SDA bus, checking the device type identifier being transmitted and, upon receiving a ‘1010 ’ code, the slave device outputs an Acknowledge signal on the SDA line. Depending on the state of the R/W bit, the 24XX08 will select a read or write operation. FIGURE 5-1: CONTROL BYTE ALLOCATION FIGURE 5-2: ADDRESS SEQUENCE BIT ASSIGNMENTS Operation Control Code Block Select R/W Read 1010 Block Address 1 Write 1010 Block Address 0 10 1 0 x B1 B0 R/W ACK Start Bit Read/Write Bit x = “don’t care” S Slave Address Acknowledge Bit Control Code Block Select Bits 1 010 B1 B0 R/W A 7 A 0 •• • • • • Control Byte Address Low Byte Control Code Block Select bits x = “don’t care” X |
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