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型號(hào)：	μPD98501
廠(chǎng)商：	NEC Corp.
英文描述：	Network Controller(網(wǎng)絡(luò)控制器)
中文描述：	網(wǎng)絡(luò)控制器（網(wǎng)絡(luò)控制器）
文件頁(yè)數(shù)：	322/671頁(yè)
文件大?。?/td>	2229K
代理商：	ΜPD98501

CHAPTER 4 ATM CELL PROCESSOR

Preliminary User’s Manual S14767EJ1V0UM00

4.8.2.6 Scheduling

ATM Cell Processor holds a scheduling table in which ATM Cell Processor sets the transmitting timings of all active

channels. Transmitting timing is recalculated each time ATM Cell Processor transmits a cell. Transmitting timing is

calculated using line rate and rate information which is set by host prior to the Tx_Ready command. Rate information

is written in Tx VC table. For ABR, rate information is dynamically changed. ABR scheduling is described in Section.

4.8.2.7 IP support

ATM Cell Processor dynamically maps IP flow into ATM flow. Once V

4120A RISC Processor sets the IP flow to

ATM flow mapping, V

4120A RISC Processor doesn’t have to care ATM flow afterwards. V

4120A RISC Processor

just prepares the packet and informs start address of the packet data with Tx_Ready command.

(1) IP header

ATM Cell Processor compares Flow table and IP header of transmitting IP packet. If the Fragment is 0, that means

the first fragment, TCP header is also compared. When Flow table has same information as TCP/IP headers have,

ATM Cell Processor transmits a cell using a specific VC. IP header and TCP header are following. Here, the fields

darkened are used for comparison between flow table.

Figure 4-39. IP Header

Total Length

Identification ID

Fragment Offset

Header Checksum

Source IP Address

Destination IP Address

(a) Version: Indicating the IP header version.

(b) IHL (Internet Header Length) : Indicating the length of the IP header in word.

(d) Total Length: Indicating datagram size in octet. The maximum size of IP datagram is 65545 octets.

(e) Identification : Indication for each datagram used to reconstruct divided datagrams.

(f) Flag : indicating the divide operation.

(g) Fragment Offset: Indicating where this fragment is located in original datagram. The unit is 8 octets.

(h) Time to Live (TTL): Indicating how long the datagram can exists in the network. The unit is a second.

(i) Protocol: Indicating the protocol in higher layer.

(j) Header Checksum. Indicating the checksum of IP header.

(k) Source Address:

(l) Destination Address.

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