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型號(hào)：	μPD98501
廠商：	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)：	295/671頁(yè)
文件大?。?/td>	2229K
代理商：	ΜPD98501

CHAPTER 4 ATM CELL PROCESSOR

Preliminary User’s Manual S14767EJ1V0UM00

Rx pool descriptor

A pool descriptor contains two words shown as Figure 4-15. Its address is word aligned.

Figure 4-15. Rx Pool Descriptor

-Rx pool descriptor

Rx buffer directory Address

Remaining # of dir. in the pool

dir. size in the pool

Table 4-2. List of Rx Pool Attributes

When the remaining number of buffer directories is lower than this number times 4, an alert interrupt

Dir. size in the pool

It contains the number of Rx buffer descriptors in a buffer directories in the pool.

Remaining number

of dir. in the pool

It contains the current remaining number of buffer directories.

Directory Address

It contains address of the first buffer directory in the pool.

Rx buffer directory

Rx buffer directory contains some buffer descriptors, not more than 255, and a link pointer. Number of buffer

descriptors in directories in one pool is identical. Number can vary in different pools.

Address of buffer directory is word aligned. The end of buffer directory must be a link pointer. Buffer descriptor

must be read and used from the top in a sequential manner.

4.5.2.3 Rx buffer descriptor

Both a Rx buffer descriptor and a Rx link pointer consist of 2 words. DL bit, bit 30 of the first word, indicates that

these two words are a buffer descriptor (DL=1) or a link pointer (DL=0).

A Rx buffer descriptor is shown as Figure 4-16. Its address is word aligned. L bit indicates that the buffer pointed

by this descriptor contains the last potion of a packet.

A Rx link pointer is shown as Figure 4-16. If there is no buffer directory to be linked, directory address of link

pointer must be zero, as a null pointer.

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