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LAN9252/ML Datasheet(PDF) 110 Page - Microchip Technology |
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LAN9252/ML Datasheet(HTML) 110 Page - Microchip Technology |
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110 / 329 page ![]() LAN9252 DS00001909A-page 110 2015 Microchip Technology Inc. 10.2.5 QUAD OUTPUT READ The SPI Quad Output Read instruction inputs the instruction code and the address and dummy bytes one bit per clock and outputs the data four bits per clock. This instruction is supported in SPI bus protocol only with clock frequencies up to 80 MHz. This instruction is not supported in SQI bus protocol. The SPI slave interface is selected by first bringing SCS# active. The 8-bit SQOR instruction, 6Bh, is input into the SIO[0] pin, followed by the two address bytes and 1 dummy byte. The address bytes specify a BYTE address within the device. On the falling clock edge following the rising edge of the last dummy bit, the SIO[3:0] pins are driven starting with the msn of the LSB of the selected register. The remaining register nibbles are shifted out. The SCS# input is brought inactive to conclude the cycle. The SIO[3:0] pins are three-stated at this time. Figure 10-8 illustrates a typical single and multiple register quad output read. FIGURE 10-8: SPI QUAD OUTPUT READ SPI Quad Output Read Single Register SCK (active high) SIO0 01 1 1 X Instruction 1 Address SIO1 d e c Data A 1 3 SPI Quad Output Read Multiple Registers 10 D 5 D 4 D 1 Z Z X SCK (active low) SCS# X 1 2 3 4 5 6 7 8 9 1 0 1 1 1 2 1 3 1 4 1 5 1 6 3 3 3 4 3 5 X 1 2 3 4 5 6 7 8 9 1 0 1 1 1 2 1 3 1 4 1 5 1 6 3 3 3 4 3 5 3 7 3 8 3 9 4 0 X X 3 7 3 8 3 9 4 0 D 1 7 i n c A 1 2 A 1 1 A 1 0 A 9 A 8 A 7 A 6 A 5 A 4 A 3 A 2 A 1 A 0 1 7 1 8 1 9 2 0 2 1 2 2 2 3 2 4 1 7 1 8 1 9 2 0 2 1 2 2 2 3 2 4 SCK (active high) SIO0 X Instruction Address SIO1 d e c A 1 3 ... ... Z SCK (active low) SCS# ... X 1 2 3 4 5 6 7 8 9 1 0 1 1 1 2 1 3 1 4 1 5 1 6 X 1 2 3 4 5 6 7 8 9 1 0 1 1 1 2 1 3 1 4 1 5 1 6 X X i n c A 1 2 A 1 1 A 1 0 A 9 A 8 A 7 A 6 A 5 A 4 A 3 A 2 A 1 A 0 1 7 1 8 1 9 2 0 2 1 2 2 2 3 2 4 1 7 1 8 1 9 2 0 2 1 2 2 2 3 2 4 ... ... ... ... x x x x x x x x 2 5 2 6 2 7 2 8 2 9 3 0 3 1 3 2 2 5 2 6 2 7 2 8 2 9 3 0 3 1 3 2 Dummy x x x x x x x x Dummy 2 5 2 6 2 7 2 8 2 9 3 0 3 1 2 5 2 6 2 7 2 8 2 9 3 0 3 1 3 2 3 2 3 3 3 4 3 5 3 3 3 4 3 5 D 2 5 Data 1... Data m Data m+1... Data n ... D 0 D 1 3 D 1 2 D 2 4 D 1 6 D 2 8 D 2 9 X Data D 5 D 4 D 1 D 0 D 1 3 D 1 2 D 1 7 D 2 5 D 2 4 D 1 6 D 2 8 D 2 9 Z X X Data 1... Data m Data m+1... Data n SIO2 Z ... ... Data 1... Data m Data m+1... Data n D 6 D 2 D 1 4 D 1 8 D 2 6 D 3 0 Z X SIO3 Z ... ... Data 1... Data m Data m+1... Data n D 7 D 3 D 1 5 D 1 9 D 2 7 D 3 1 Z X D 5 D 4 D 1 D 0 D 1 3 D 1 2 D 6 D 2 D 1 4 D 7 D 3 D 1 5 D 1 7 D 2 5 D 2 4 D 1 6 D 2 8 D 2 9 D 1 8 D 2 6 D 3 0 D 1 9 D 2 7 D 3 1 SIO2 Z D 6 D 2 D 1 4 D 1 8 D 2 6 D 3 0 SIO3 Z D 7 D 3 D 1 5 D 1 9 D 2 7 D 3 1 Z X Z X 0 01 1 1 1 10 0 Data Data 3 6 3 6 D 9 D 8 D 2 1 D 2 0 D 1 0 D 2 2 D 1 1 D 2 3 |
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