PEB22554 SIEMENS [Siemens Semiconductor Group], PEB22554 Datasheet - Page 273

• 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 71.
Figure 71
Interrupt Driven Data Transmission (flow diagram)
The activities at both serial and CPU interface during frame transmission (supposed
frame length = 70 bytes) is shown in figure 72.
Semiconductor Group
FALC
System
Interface
CPU
Interface
R
Command
XTF/XHF
WR XFIFO
32 bytes
XHF
XPR
N
N
WR XFIFO
32 bytes
32
Command
XTF/XHF
Write Data
(up to 32
to XFIFO
Transmit
Pool Ready
Command
Transmit Frame (70 bytes)
End of
Message
273
START
END
XHF
?
?
Y
Y
+ XME
bytes)
XPR
Operational Description T1 / J1
WR XFIFO
6 bytes
32
XPR Interrupt,
XFW Bit in SIS Register
XHF + XME
or
ITD08565
XPR
PEB 22554
6
ITD10971
ALLS
= 1
09.98