Datasheet

____________________________________________________ DS34T101, DS34T102, DS34T104, DS34T108
148 of 366
10.14.5.1 Transmit Error Insertion
Errors can be inserted into the generated pattern one at a time or at a rate of one out of every 10
n
bits. The value of
n is programmable (1 to 7 or off) in the TEICR.TEIR[
2:0] configuration field.. Single bit error insertion is enabled by
setting TEICR.BEI and ca
n be initiated by a zero-to-one transition of TEICR.TSEI.
10.15 LIU - Framer Connections
By default each TDM port of the device has its framer connected to the internal LIU for that port. See Figure 6-1. As
a configuration option, the internal LIU for any port can be disabled and the framer for that port can be connected
to an external LIU or other component, such as an M13 mux or a SONET/SDH mapper. See Figure 10-81 below.
When GCR2.LIUDn
=0, the internal LIU is enabled, and the framer is connected to the internal LIU. When
GCR2.LIU
Dn=1, the internal LIU is disabled, and the corresponding RCLKFn and TDATFn pins are enabled to
allow the framer to connect to an external component.
When GCR2.LIUDn=1, the CPU m
ust also set RCR3.IDF=1 and TCR3.ODF=1 to configure the framer’s LIU
interface for NRZ mode. The external component must also be configured for NRZ mode. If the external
component is an E1/T1 LIU, it must also have HDB3 or B8ZS encoder and decoder enabled for proper operation.
Figure 10-81. LIU + Framer Connections
Framer
TPOS
TNEG
TCLK
RPOS
RNEG
RCLK
LIU
TPOS
TNEG
TCLK
RPOS
RNEG
RCLK
TPOS
TNEG
TCL
K
RPOS
RNEG
RCLK
Framer
TPOS
TNEG
TCLK
RPOS
RNEG
RCLK
TPOS
TNEG
TCLK
RPOS
RNEG
RCLK
External NRZ Operation
To TDATF pin
To TCLKO pin
To RDATF pin
To RCLKF pin
Normal Operation