mcs7830 MosChip, mcs7830 Datasheet - Page 24

• Manufacturer Part Number: mcs7830
• Description: Usb-2.0 To Ethernet
• Manufacturer: MosChip

Page 24
MCS7830
USB-2.0 to Ethernet
PHY Command Registers
These registers each hold part of the Command for the MIIM. These registers are used to perform read/write
operations from/to the external PHY.
HIF_REG13:
HIF_REG14:
Write Process:
It is a two stage process. The Host writes the command into registers 13/14 and the data into registers 11/12.
The Command consists of Ethernet PHY-address/reg-address/opcde. When the Host sends a new command,
it sets Bit-7 (Pending), and resets Bit-6 (Ready).
After the command is processed, the Ethernet MAC Controller asserts Bit-6 (Ready). The Host polls this
register after a fi xed time to check this bit, if found ready, it understands that the command was processed.
Read Process:
Same as for write, except that the data read from the Ethernet PHY is stored in the HIF_REG11/12, and the
Host reads this data after it fi nds the Ready fl ag set.
Address
Address
0x0D
0x0C
Pending
Reserved
PHY Command
Bit-7
[4:0]
Flag
Bit
Bit-7
5
6
7
PHY Command
Field
Field
Ready
Ethernet PHY Address
Bit-6
Flag
Opcode to read/write from/to PHY Reg.
Pending Flag
Ready Flag
Function
Unused
not used
R/W
Bit-5
HW
00
01
10
11
HW
R
R/W
SW
Bit-[6:5]
not defi ned
write operation
read operation
not defi ned
Address of the register within the Ethernet PHY being accessed.
R/W
SW
Default
The address of the registers in the ETHERNET PHY.
Unused
The Ethernet MAC Controller sets this bit after processing
the Pending command.
0: No command was received from the host.
1: A new command was received from the host, and
0x00
Default
processed by the Ethernet MAC.
0x00
Status and Control
Description
Description
Opcode
Address of the PHY being accessed
Bit-[4:0]
Description
Bit-[4:0]
Rev.
3.1