PEF2054 SIEMENS [Siemens Semiconductor Group], PEF2054 Datasheet - Page 221

• Manufacturer Part Number: PEF2054
• Description: ICs for Communications
• Manufacturer: SIEMENS [Siemens Semiconductor Group]

– Timer to define the last look period for signaling channels at the CFI
Figure 77
Timer Applications
5.8
5.8.1
Hardware Timer
The EPIC provides a programmable hardware timer which can be used for three
purposes:
– General purpose timer for continuously interrupting the P at programmable time
– Timer to define the FSC multiframe generation at the CFI (CMD2:FC2 … 0 = 111,
Normally in a system only one of these functions is required and therefore active at a
time. However, it is also possible to have any combination of these functions active, if it
is acceptable that all three applications use the same timer value.
The timer period can be selected from 250 s up to 32 ms in increments of 250 s.
Semiconductor Group
intervals.
(see chapter 5.5.1).
see chapter 5.2.2.3).
Timer Start
CMDR : ST = 1
(CMDR : TIG = 1)
T = (TVAL6...0 + 1) x 250 µs
LL : Last Look
Supervision Functions
Hardware Timer
T
(ISTA : TIN)
LL Sampling
Multifr. Sync.
221
T
(ISTA : TIN)
LL Sampling
Multifr. Sync.
Application Hints
Timer Stop
TIMR = XX
ITD08093
PEB 2055
PEF 2055