PEB22554 SIEMENS [Siemens Semiconductor Group], PEB22554 Datasheet - Page 90

• Manufacturer Part Number: PEB22554
• Description: ICs for Communications
• Manufacturer: SIEMENS [Siemens Semiconductor Group]

The data transmission sequence, from the CPU’s point of view, is outlined in figure 31.
Figure 31
Interrupt Driven Data Transmission (flow diagram)
The activities at both serial and CPU interface during frame transmission (supposed
frame length = 70 bytes) shown in figure 32.
Semiconductor Group
FALC
System
Interface
CPU
Interface
R
WR XFIFO
Command
XTF/XHF
32 bytes
XHF
XPR
WR XFIFO
32 bytes
N
N
32
Command
XTF/XHF
Write Data
(up to 32
to XFIFO
Command
Transmit Frame (70 bytes)
90
Transmit
Pool Ready
End of
Message
XHF
START
END
?
?
Y
Y
+ XME
bytes)
XPR
WR XFIFO
6 bytes
Operational Description E1
32
XPR Interrupt,
XFW Bit in SIS Register
XHF + XME
or
XPR
PEB 22554
ITD08565
6
ITD10971
ALLS
= 1
09.98