MDS212 Datasheet, PDF (84/111 Pages) Zarlink Semiconductor Inc – 12-Port 10/100Mbps Ethernet Switch

MDS212
Data Sheet
18.2.9.1 AMIIC - MII Command Register
This is a write-only register. The upper layer services write the management frame to be sent to the PHYs into this
register. The MSB (bit 31) is the first bit sent over the serial interface.
• Access:
• Address:
Non-Zero-Wait-State, Direct Access,
h654
Write only
31 30 20 28 27
ST OP
PHY_AD
23 22
18 17 16 15
REG_AD
TA
DATA (16-bit)
210
Bit [31:30]
Bit [29:28]
Bit [27:23]
Bit [22:18]
Bit [17:16]
Bit [15:0]
ST
OP
PHY_AD
REG_AD
TA
DATA
Start of frame – always = “01”
Operation code – “10” for read command and “01” for write
command
5-bit PHY Address
5-bit Register Address in PHY
Turnaround – “10” for write
16-bit Write Data to PHY
18.2.9.2 AMIIS - MII Status Register
The upper layer services should read this register for data sent by the PHYs. The lower 16 bits contain data
received by the Management Module
• Access:
• Address:
Non-Zero-Wait-State, Direct Access,
h658
Read only
31 30 29
RY VD
16 15
DATA (16-bit)
210
Bit [31]
Bit [30]
Bit [15:0]
RDY
VALID
DATA
Data Ready
Data Valid
16-bit Read Data from PHY
Bit [31] RDY Bit [30] VALID
Description
1
1
Data field contains valid data from the PHYs.
1
0
Data field contains invalid data from the PHYs.
0
X
Data field is not ready to be read by Switch Manager CPU.
Table 13 - AMIIS - MII Status Register
84
Zarlink Semiconductor Inc.