zl50411 Zarlink Semiconductor, zl50411 Datasheet - Page 36

• Manufacturer Part Number: zl50411
• Description: Managed 9-port Fast Ethernet Switch With Private Vlan
• Manufacturer: Zarlink Semiconductor

3 ID bits are used to allow up to eight ZL50411 devices to share the same synchronous serial interface. The ID of
each device can be setup by bootstrap.
To reduce the number of signals required, the register address, command and data are shifted in serially through
the DATAIN pin. STROBE- pin is used as the shift clock. DATAOUT pin is used as data return path.
Each command consists of four parts.
•
•
•
•
Write operation can be aborted in the middle by sending an ABORT pulse to the ZL50411. Read operation can only
be aborted before issuing the read command to the ZL50411.
A START command is detected when DATAIN is sampled high when STROBE- rise and DATAIN is sampled low
when STROBE- fall.
An ABORT command is detected when DATAIN is sampled low when STROBE- rise and DATAIN is sampled high
when STROBE- fall.
3.3.1
All registers in ZL50411 can be modified through this synchronous serial interface. Once the data has been sent,
two extra STOBE clocks must be generated to indicate the end of the write command. The DATAIN line is ignored
for these two pulses.
3.3.2
All registers in ZL50411 can be read through this synchronous serial interface.
START pulse
Register Address
Read or Write command
Data to be written or read back
Write Command
Read Command
STROBE
DATAIN
START
STROBE
DATAOUT
DATAIN
ID0
Figure 8 - Serial Interface Write Command Functional Timing
Figure 9 - Serial Interface Read Command Functional Timing
ID1
ID
START
ID2
ID0
A0
ID
ID1
ADDR
A1
ID2
A2
A0
Zarlink Semiconductor Inc.
CMD
ADDR
W
A1
D0
ZL50411
A2
D1
CMD
36
R
D2
D0
D3
D1
...
DATA
D2
D12
DATA
...
D13
D12
D14
D13
D15
D14
D15
2 Extra clocks after last
transfer
Data Sheet