参数资料
型号: ZL50418/GKC
厂商: ZARLINK SEMICONDUCTOR INC
元件分类: 网络接口
英文描述: DATACOM, LAN SWITCHING CIRCUIT, PBGA553
封装: 37.50 X 37.50 MM, 2.33 MM HEIGHT, MS-034, HSBGA-553
文件页数: 93/155页
文件大小: 1928K
代理商: ZL50418/GKC
ZL50418
Data Sheet
42
Zarlink Semiconductor Inc.
Figure 6 - Overview of the CPU Interface
3.2.1
Register Configuration, Frame Transmission, and Frame Reception
3.2.1.1
Register Configuration
The ZL50418 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 ZL50418 allows indirect access to these
registers, as follows:
If operating in 8 bits-interface mode, two “index” registers (addresses 000 and 001) need to be written to
indicate the desired 8-bit register address. In 16-bit mode, only one register (address 000) needs to be
written for the desired 16-bit register address.
To indirectly configure the register addressed by the two index registers, a “configure data” register (address
010) must be written with the desired 8-bit data.
Similarly, to read the value in the register addressed by the two index registers, the “configure data” register
can now simply be read.
In summary, access to the many internal registers is carried out simply by directly accessing only three registers –
two registers to indicate the address of the desired parameter, and one register to read or write a value. Of course,
because there is only one bus master, there can never be any conflict between reading and writing the
configuration registers.
INDEX REG 1
(Addr = 001)
INDEX REG 0
(Addr = 000)
CONFIG
(Addr = 010)
CONTROL
BLOCK REG
SYNOCHRONOUS
SERIAL
DATA REG
FRAME DATA REG
(Addr = 011)
INTERFACE
INTERNAL
CONFIGURE
REGISTERS
CPU
FRAME
RECEIVE
CONTROL
COMMAND
FRAME
CPU
FRAME
TRANSMIT
CONTROL
COMMAND
FRAME
FIFO
RECEIVE
FIFO
TRANSMIT
FIFO
1 AND 2
8 bit internal
data bus
8/16 bit internal
data bus
8/16 bit internal
data bus
16 bit internal
address bus
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