PEB2085 SIEMENS [Siemens Semiconductor Group], PEB2085 Datasheet - Page 134

• Manufacturer Part Number: PEB2085
• Description: ISDN SubscribernAccess Controller
• Manufacturer: SIEMENS [Siemens Semiconductor Group]

Figure 63
Interrupt Service Routine after XPR
Semiconductor Group
* Special Request Condition : Last frame written to the XFIFO was an answer to an identity
written to XFIFO was
ACK1 & ACK2
sent since last
CMDR:XRES
/TIN & /PCE
frame been
is currently
transmitted
Last frame
an I-frame
A frame
XPR &
SRC *
Has a
?
?
?
?
N
N
Y
Y
request following a yet unacknowledged I-frame
N
N
Y
Y
134
Transmission of the last
frame has finished
Xmit command
End
Continue writing the contents
of the frame to XFIFO & issuing
Xmit command
The transmission of the I-frame
was successful and has been
acknowledged by the peer station
Functional Description
ITD05893
ACK2
ACK1