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型號：	935279245557
廠商：	NXP SEMICONDUCTORS
元件分類：	消費家電
英文描述：	SPECIALTY CONSUMER CIRCUIT, PBGA456
封裝：	27 X 27 MM, 1.75 MM HIEGHT, PLASTIC, MS-034, BGA-456
文件頁數：	691/828頁
文件大小：	7748K
代理商：	935279245557

Philips Semiconductors

PNX15xx Series

Volume 1 of 1

Chapter 23: LAN100 — Ethernet Media Access Controller

PNX15XX_SER_3

Product data sheet

Rev. 3 — 17 March 2006

been reached and the status of the third fragment is written. The third fragment’s

status word will have the Last bit set to 1 and the EntryLevel equal to 2 (for a value of

3, because of –1 encoding).

The next packet received from the MII interface will be written to the fourth fragment

buffer, therefore ve bytes of the third buffer will be unused.

The Rx DMA manager checks to make sure receive data and status data have been

committed to memory. Only if memory acknowledges that the data has been

committed to memory will the RxProduceIndex be updated and the interrupt ags be

forwarded to the IntStatus register. The LAN100 tags receive data and statuses

continuously but does not necessarily tag every data and every status individually.

After committing status of the fragments to memory the LAN100 will trigger a

RxDoneInt interrupt, which triggers the device driver to inspect the status information.

In this example all descriptors have the Interrupt bit set in the Control word, so all

descriptors will generate an interrupt after committing data and status to memory.

In this example, the receive function of the LAN100 cannot read new descriptors as

long as the device driver does not increment the RxConsumeIndex because the

descriptor array is full (even though one descriptor is not programmed yet, see

Section 5.2.4 on page 23-35). Only after the device driver has forwarded the receive

data to application software and after the device driver has updated the

RxConsumeIndex by incrementing it by the number of received fragments (3 in this

case) can the LAN100 continue reading descriptors and receive data.

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