pef2256e Infineon Technologies Corporation, pef2256e Datasheet - Page 71

• Manufacturer Part Number: pef2256e
• Description: E1/t1/j1 Framer And Line Interface Component For Long- And Short-haul Applications
• Manufacturer: Infineon Technologies Corporation

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The following table shows the clock modes with the corresponding synchronization
sources.
Table 14
Mode
Master
Master
Master
Slave
Slave
Slave
Slave
The jitter attenuator meets the jitter transfer requirements of the ITU-T I.431 and G.735
to 739 (refer to
User’s Manual
Hardware Description
Slave mode
In slave mode (LIM0.MAS = 0) the DCO-R is synchronized with the recovered route
clock. In case of LOS the DCO-R switches automatically to Master mode. If bit
CMR1.DCS is set automatic switching from RCLK to SYNC is disabled.
Master mode
In master mode (LIM0.MAS = 1) the jitter attenuator is in free running mode if no
clock is supplied on pin SYNC. If an external clock on the SYNC input is applied, the
DCO-R synchronizes to this input. The external frequency can be 2.048 MHz
(IPC.SSYF = 0) or 8.0 kHz (IPC.SSYF = 1).
Internal
LOS Active
independent Fixed to
independent 2.048
independent 8.0 kHz
no
no
yes
yes
System Clocking (E1)
Figure
20)
SYNC
Input
V
MHz
Fixed to
V
2.048
MHz
Fixed to
V
2.048
MHz
DD
DD
DD
System Clocks generated by DCO-R
DCO-R centered, if CMR2.DCF = 0.
(CMR2.DCF should not be set)
Synchronized to SYNC input (external
2.048 MHz, IPC.SSYF = 0)
Synchronized to SYNC input (external 8.0 kHz,
IPC.SSYF = 1, CMR2.DCF = 0)
Synchronized to line RCLK
Synchronized to line RCLK
CMR1.DCS = 0:
DCO-R is centered, if CMR2.DCF = 0.
(CMR2.DCF should not be set)
CMR1.DCS = 1:
Synchronized on line RCLK
CMR1.DCS = 0:
Synchronized to SYNC input
(external 2.048 MHz)
CMR1.DCS = 1:
Synchronized on line clock RCLK
71
Functional Description E1
DS1.1, 2003-10-23
PEF 2256 H/E
FALC
®
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