HD6417618 RENESAS [Renesas Technology Corp], HD6417618 Datasheet - Page 285

• Manufacturer Part Number: HD6417618
• Description: 32-Bit RISC Microcomputer SuperHTM RISC engine Family / SH7618 Series
• Manufacturer: RENESAS [Renesas Technology Corp]

MII Register Access Procedure: The program accesses MII registers via the PHY interface
register (PIR). Access is implemented by a combination of 1-bit-unit data write, 1-bit-unit data
read, bus release, and independent bus release. Figure 11.9 shows the MII register access timing.
The timing will differ depending on the PHY type.
(1)
(2)
(3)
Write to PHY interface
register
MMD = 1
MDO = write data
MDC = 0
Write to PHY interface
register
MMD = 1
MDO = write data
MDC = 1
Write to PHY interface
register
MMD = 1
MDO = write data
MDC = 0
Figure 11.6 (1) 1-Bit Data Write Flowchart
MDC
MDO
1-bit data write timing
relationship
(1) (2)
Rev. 6.00 Jun. 12, 2007 Page 253 of 610
Section 11 Ethernet Controller (EtherC)
(3)
REJ09B0131-0600