LAN9252SLASHML datasheet(91/329 Pages) MICROCHIP

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 2015 Microchip Technology Inc.

DS00001909A-page 91

LAN9252

16-BIT READ AND WRITE

For writes, the address is set to access the lower WORD of the Configuration Register. Data on D[15:0] is written on the

trailing edge of WR. The cycle repeats for the upper WORD of the Configuration Register, if desired by the host.

For reads, the address is set to access the lower WORD of the Configuration Register. Read data is driven on D[15:0]

during RD active. The cycle repeats for the upper WORD of the Configuration Register, if desired by the host.

8-BIT READ AND WRITE

For writes, the address is set to access the lower BYTE of the Configuration Register. Data on D[7:0] is written on the

trailing edge of WR. D[15:8] pins are not used or driven. The cycle repeats for the remaining BYTEs of the Configuration

For reads, the address is set to access the lower BYTE of the Configuration Register. Read data is driven on D[7:0]

during RD active. D[15:8] pins are not used or driven. The cycle repeats for the remaining BYTEs of the Configuration

FIGURE 9-25:

INDEXED ADDRESSING CONFIGURATION REGISTER ACCESS - 16-BIT WRITE/

READ

FIGURE 9-26:

INDEXED ADDRESSING CONFIGURATION REGISTER ACCESS - 8-BIT WRITE/

READ

CONFIG,1'b0

Data 15:8

D[15:8]

A[4:1]

CONFIG,1'b1

Data 31:24

Data 7:0

D[7:0]

Data 23:16

CONFIG,1'b0

Data 15:8

Data 7:0

CONFIG,1'b1

Data 31:24

Data 23:26

CONFIG,2'b00

D[15:8]

A[4:0]

CONFIG,2'b01

Data 7:0

D[7:0]

Data 15:8

CONFIG,2'b00

CONFIG,2'b01

CONFIG,2'b10

CONFIG,2'b11

Data 23:16

Data 31:24

Hi-Z

Data 7:0

Data 15:8

Data 23:16

Data 31:24

CONFIG,2'b10

CONFIG,2'b11

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