Rainbow Electronics DS2172 - Manual (Page 3)

DS2172
031197 3/20
DS2172 FUNCTIONAL BLOCK DIAGRAM Figure 1
BTS RD WR TEST ALE CS INT AD0–AD7
PARALLEL CONTROL PORT
PATTERN
GENERATOR
ERROR
INSERTION
TRANSMIT
RATE
CONTROL
RECEIVE PATTERN
REGISTERS
PATTERN
DETECTOR
BIT COUNTER
BIT ERROR COUNTER
LOOPBACK MUX
RECEIVE
RATE
CONTROL
LC
SYNC
RL
TL
RDIS
RCLK
RDATA
TDIS
TCLK
TDATA
DS2172 PATTERN GENERATION BLOCK DIAGRAM Figure 2
XOR DFF DFF DFF DFF
XOR
EIR.5
PCR.5
TAP B FEEDBACK
0 1 N–2 N–1
TAP A FEEDBACK
NOTES:
1. Tap A always equals length (N–1) of pseudorandom or repetitive pattern.
2. Tab B can be programmed to any feedback tap for pseudorandom pattern generation.