ST5451 datasheet(13/34 Pages) STMICROELECTRONICS

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ST5451 Scheda tecnica(PDF) 13 Page - STMicroelectronics

Il numero della parte	ST5451

Spiegazioni elettronici	ISDN HDLC AND GCI CONTROLLER

PDF	34 Pages

Scroll/Zoom	100%

Produttore elettronici	STMICROELECTRONICS [STMicroelectronics]

Homepage	http://www.st.com

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13 / 34 page

4- 2 - TRANSMIT FRAME

After polling bit XFW or after a XPR interrupt, up

to 32 bytes may be stored in XFIFO. Transmis-

sion begins after that XHF command is issued by

µP. ST5451 will request another data block by an

XPR interrupt if the XFIFO contains less than 32

bytes.

When XME is set, all remaining XFIFO bytes are

transmitted, the CRC field and the closing flag are

added. The HDLC controller then generates a

new XPR interrupt.

If the XFIFO becomes empty while XME com-

mand has not been set, an abort sequence is

generated, followed by interframe time fill and

XDU interrupt is generated.

A frame may be aborted by XRES command as

well.

Figure 2: Transmission of an HDCL frame

ST5451

13/34

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