MC145572PB Freescale Semiconductor, MC145572PB Datasheet - Page 52

• Manufacturer Part Number: MC145572PB
• Manufacturer: Freescale Semiconductor

Specifications of MC145572PB

• Number Of Line Interfaces: 1
• Control Interface: HDLC
• Lead Free Status / Rohs Status: Not Compliant

4–16
Figures 4–1 and 4–2 may be used to determine the combined effect of setting more than one loopback
control in BR6, as well as the bits in NR5 and BR7. Only details for the B1 channel are shown, but
a similar set of logic applies to both the B2 and D channels. D out and D in refer to the two external
pins on the device. There are two control signals shown in Figure 4–2 that do not come from MC145572
registers. Link Active is an internal signal that is asserted when the ANSI T1.601–1992 defined activa-
tion sequence reaches SN3/SL3 and Customer Enable (NR2(b0)) is set, or Verified act (BR3(b2))
is set. Link Good is asserted whenever the ANSI T1.601–1992 defined activation sequence is com-
pleted successfully and the internally monitored receive error rate is adequate for passing data.
Freescale Semiconductor, Inc.
For More Information On This Product,
Figure 4–1. IDL2 Interface Loopback Control Bits
BR6
BR7
b7
b7
Go to: www.freescale.com
b6
b6
b5
b5
MC145572
NR5
b4
b4
b3
b3
b3
b2
b2
b2
b1
b1
b1
b0
b0
b0
NOT USED
BLOCK B1
BLOCK B2
SWAP B1/B2
U-LOOP B1
U-LOOP B2
U-LOOP 2B+D
U-LOOP TRANSPARENT
IDL2-LOOP B1
IDL2-LOOP B2
IDL2-LOOP 2B+D
IDL2-LOOP TRANSPARENT
IDL2 INVERT
IDL2 FREE RUN
IDL2 SPEED
IDL2 M/S INVERT
IDL2 8/10
MOTOROLA