r5s77631ay266bgv Renesas Electronics Corporation., r5s77631ay266bgv Datasheet - Page 1057

• Manufacturer Part Number: r5s77631ay266bgv
• Description: Renesas 32-bit Risc Microcomputer Superhtm Risc Engine Family Sh-4a Series
• Manufacturer: Renesas Electronics Corporation.

23.5.5
This LSI supports an RMII interface. The RMII signals are generated by converting the MII
signals in the MII-RMII conversion circuit.
(1)
REF50CK (50 MHz) from the RMII interface is divided and ET_TX-CLK/ET_RX-CLK (25 MHz
or 2.5 MHz) is output.
Figure 23.36 Independent Bus Release Flowchart (IDLE in Write in Figure 23.33)
Clock
Mll-RMII Interface Conversion
(1)
(2)
(2)
(1)
Write to PHY interface
register
ET_MMD = 0
ET_MDC = 1
Read from PHY
interface register
ET_MMD = 0
ET_MDC = 1
ET_MDI is read data
Write to PHY interface
register
ET_MMD = 0
ET_MDC = 0
Write to PHY interface
register
ET_MMD = 0
ET_MDC = 0
Figure 23.35 1-Bit Data Read Flowchart
ET_MDC
ET_MDI
ET_MDC
ET_MDO
Section 23 Gigabit Ethernet Controller (GETHER)
1-bit data read timing
relatinship
Independent bus release
timing relationship
(1)
Rev. 1.00 Oct. 01, 2007 Page 991 of 1956
(2)
(3)
(1)
REJ09B0256-0100