Rainbow Electronics DS2172 User Manual
Page 9
DS2172
031197 9/20
7.0 ERROR INSERT REGISTER
The Error Insertion Register (EIR) controls circuitry
within the DS2172 that allows the generated pattern to
be intentionally corrupted. Bit errors can be inserted
automatically at regular intervals by properly program-
ming the EIR0 to EIR2 bits or bit errors can be inserted at
random (under microcontroller control) via the EIR.3 bit.
EIR: ERROR INSERT REGISTER (Address=07 Hex)
(MSB)
(LSB)
–
–
TINV
RINV
SBE
EIR2
EIR1
EIR0
SYMBOL
POSITION
NAME AND DESCRIPTION
–
EIR.7
Not Assigned. Should be set to 0 when written to.
–
EIR.6
Not Assigned. Should be set to 0 when written to.
TINV
EIR.5
Transmit Data Inversion Select.
0 = do not invert data to be transmitted at TDATA
1 = invert data to be transmitted at TDATA
RINV
EIR.4
Receive Data Inversion Select.
0 = do not invert data received at RDATA
1 = invert data received at RDATA
SBE
EIR.3
Single Bit Error Insert. A low to high transition will create a single bit error.
Must be cleared and set again for a subsequent bit error to be inserted. Can
be used to accomplish rates not addressed in Table 3 (e.g., BER of less
than 10
–7
).
EIB2
EIR.2
Error Insert Bit 2. See Table 3.
EIB1
EIR.1
Error Insert Bit 1. See Table 3.
EIB0
EIR.0
Error Insert Bit 0. See Table 3.
ERROR BIT INSERTION Table 3
EIB2
EIB1
EIB0
ERROR RATE INSERTED
0
0
0
no errors automatically inserted
0
0
1
10
–1
0
1
0
10
–2
0
1
1
10
–3
1
0
0
10
–4
1
0
1
10
–5
1
1
0
10
–6
1
1
1
10
–7