Datasheet

DS26521 Single T1/E1/J1 Transceiver
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8.12 Bit-Error-Rate Test (BERT) Function
The bit-error-rate tester (BERT) block can generate and detect both pseudorandom and repeating bit patterns. It is
used to test and stress data-communication links. BERT functionality is dedicated for each of the transceivers.
Table 8-35 shows the registers related to the configure, control, and status of the BERT.
Table 8-35. Registers Related to BERT Configure, Control, and Status
REGISTER
FRAMER
ADDRESSES
FUNCTION
Global BERT Interrupt Status Register
(
GBISR)
0FAh
When the BERT issues an interrupt, a bit is
set.
Global BERT Interrupt Mask Register
(
GBIMR)
0FDh
When the BERT issues an interrupt, a bit is
set.
Receive Expansion Port Control Register
(
RXPC)
08Ah Enable for the receiver BERT.
Receive BERT Port Bit Suppress Register
(
RBPBS)
08Bh Bit suppression for the receive BERT.
Receive BERT Port Channel Select
Registers 1 to 4 (
RBPCS1:RBPCS4)
0D4h, 0D5h, 0D6h,
0D7h
Channels to be enabled for the framer to
accept data from the BERT pattern generator.
Transmit Expansion Port Control Register
(
TXPC)
18Ah Enable for the transmitter BERT
Transmit BERT Port Bit Suppress
Register (
TBPBS)
18Bh Bit suppression for the transmit BERT
Transmit BERT Port Channel Select
Registers 1 to 4 (
TBPCS1:TBPCS4)
1D4h, 1D5h, 1D6h,
1D7h
Channels to be enabled for the framer to
accept data from the transmit BERT pattern
generator.
BERT Alternating Word Count Rate
Register (
BAWC)
1100h BERT alternating pattern count register.
BERT Repetitive Pattern Set Register 1
(
BRP1)
1101h BERT repetitive pattern set register 1.
BERT Repetitive Pattern Set Register 2
(
BRP2)
1102h BERT repetitive pattern set register 2.
BERT Repetitive Pattern Set Register 3
(
BRP3)
1103h BERT repetitive pattern set register 3.
BERT Repetitive Pattern Set Register 4
(
BRP4)
1104h BERT repetitive pattern set register 4.
BERT Control Register 1 (BC1) 1105h Pattern selection and miscellaneous control.
BERT Control Register 2 (BC2) 1106h BERT bit pattern length control.
BERT Bit Count Register 1 (BBC1) 1107h
BERT bit counter—increments for BERT bit
clocks.
BERT Bit Count Register 2 (BBC2) 1108h BERT bit counter.
BERT Bit Count Register 3 (BBC3) 1109h BERT bit counter.
BERT Bit Count Register 4 (BBC4) 110Ah BERT bit counter.
BERT Error Count Register 1 (BEC1) 110Bh BERT error counter.
BERT Error Count Register 2 (BEC2) 110Ch BERT error counter.
BERT Error Count Register 3 (BEC3) 110Dh BERT error counter.
BERT Latched Status Register (BLSR) 110Eh
BERT status registers—denotes
synchronization loss and other status.
BERT Status Interrupt Mask Register
(
BSIM)
110Fh BERT Interrupt mask.