ZL50400GDC ZARLINK [Zarlink Semiconductor Inc], ZL50400GDC Datasheet - Page 25

• Manufacturer Part Number: ZL50400GDC
• Description: Lightly Managed/Unmanaged 9-Port 10/100 M Ethernet Switch
• Manufacturer: ZARLINK [Zarlink Semiconductor Inc]

3.1
3.1.1
The ZL50400 has many programmable parameters, covering such functions as QoS weights, VLAN control, and
port mirroring setup. In managed mode, the CPU interface provides an easy way of configuring these parameters.
The parameters are contained in 8-bit configuration registers. The device allows indirect access to these registers,
as follows:
•
•
In serial mode, the address, command and data are shifted in serially. To access the configuration registers,
an “index” register (addresses 000b) needs to be written with the configuration register address. The desired
data can be written into or read from the “data” register (address 010b).
•
To indirectly configure the register addressed by the index register, a “data” register (address 010b) must be
written with the desired 8-bit data.
Register Configuration, Frame Transmission, and Frame Reception
For example, if “XX” is required to be written to register “YY”, a write of “YY” is required to write to
address “000b” (Index register). Then, a write of “XX” is required to write to address “010b” (Data
Register). This completes the register write and register “YY” will contain the value of “XX”.
Register Configuration
16-bit Address
Index Reg 0
(Addr = 0)
8-bit Data Bus
Conf ig Data
(Addr = 2)
Registers
Inderect
Access
Internal
Reg
Figure 3 - Overview of the SSI Interface
3-bit Address Bus
8/16-bit Data Bus
CPU Frame Reg
Processor
CPU f rame
Address
(Addr = 3)
Receiv e
FIFO
Serial Out
Synchronous Serial Interface
CPU f rame
Zarlink Semiconductor Inc.
Transmit
FIFO
ZL50400
Serial In
16-bit Data Bus
Status Reg
Command/
(Addr = 4)
25
Strobe
I/O Data MUX
Interrupt
Interrupt Reg
INT CS W R
(Addr = 5)
Interrupt
8/16-bit Data Bus
Command 1
Receiv e
Control
FIFO
Control Command
(Addr = 6)
1 Reg
Command 1
Transmit
Control
FIFO
Command 2
Command 2
(Addr = 7)
Transmit
Control
Control
FIFO
Reg
Data Sheet