STE100 datasheet(48/66 Pages) STMICROELECTRONICS

Part #	STE100

Description	PCI 10/100 ETHERNET CONTROLLER WITH INTEGRATED PHY 5V

PDF	66 Pages

Scroll/Zoom	100%

Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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48 / 66 page

STE10/100

48/66

6.4 Receive scheme and Receive early interrupt scheme

The following figure shows the difference of timing without early interrupt and with early interrupt.

Figure 12. Receive data flow (without early interrupt and with early interrupt)

Figure 13. Detailed Receive Early interrupt flow

: with early interrupt

: without early interrupt

incoming packet

receive FIFO operation

FIFO-to-host memory operation

interrupt

driver read header

higher layer process

driver read the rest data

time

receive early interrupt

driver read header(early)

higher layer process(early)

driver read the rest data

finish time

FIFO-to-host memory

time

receive early

driver read

higher layer

driver read the rest

finish

descriptor

full

nd descriptor

The size of 1

descriptor is

programmed as the

header size in

advance

issue 2

interrupt at end

of packet

STE100 Datasheet(PDF) 48 Page - STMicroelectronics