參數(shù)資料
型號: DS33ZH11
廠商: MAXIM INTEGRATED PRODUCTS INC
元件分類: 網(wǎng)絡(luò)接口
英文描述: Ethernet Mapper
中文描述: DATACOM, NETWORK INTERFACE SUPPORT CIRCUIT, PBGA100
封裝: 10 X 10 MM, 1.41 MM HEIGHT, 0.80 MM PITCH, CSBGA-100
文件頁數(shù): 59/169頁
文件大?。?/td> 1049K
代理商: DS33ZH11
DS33Z11 Ethernet Mapper
59 of 169
8.19 Committed Information Rate Controller
The DS33Z11 provides a CIR provisioning facility. The CIR can be used restricts the transport of received MAC
data to a programmable rate. This is shown in
Figure 8-13
. The CIR will restrict the data flow from the Receive
MAC to Transmit HDLC. This can be used for provisioning and billing functions towards the WAN. The user must
set the CIR register to control the amount of data throughput from the MAC to HDLC transmit. The CIR register is
in granularity of 500 kbps with a range of 0 to 52 Mbps. The operation of the CIR is as follows:
The CIR block counts the credits that are accumulated at the end of every 125 ms
If data is received and stored in the SDRAM to be sent to the Serial Interface, the interface will request the
data if there is a positive credit balance. If the credit balance is negative, transmit interface does not
request data
New credit balance is calculated credit balance = old credit balance – frame size in bytes after the frame is
sent
The credit balance is incremented every 125 milliseconds by CIR/8
Credit balances not used in 250 milliseconds are reset to 0
The maximum value of CIR can not exceed the transmit line rate
If the data rate received from the Ethernet interface is higher than the CIR, the receive queue buffers will
fill and the high threshold watermark will invoke flow control to reduce the incoming traffic rate.
The CIR function is only available for software mode of operation only
CIR function is only available in data received at the Ethernet Interface to be sent to WAN. There is not
CIR functionality for data arriving from the WAN to be sent to the Ethernet Interface
Negative credits are not allowed, if there is not a credit balance, no frames are sent until there is a credit
balance again.
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