MC145572PB Freescale Semiconductor, MC145572PB Datasheet - Page 135

• 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

MOTOROLA
8.3.3
Command/Indicate Channel Operation
The Command/Indicate, or C/I channel, is used to activate and deactivate the MC145572. Some control
functions such as loopbacks are also supported over the C/I channel. C/I codes are four bits in length
and must be received for two consecutive GCI frames before they are acted upon.
C/I channel bits are numbered bit 4 through 1, with bit 4 being the most significant bit. The C/I/ channel
bits are transmitted starting with bit 4.
C/I channel commands are used to activate, or deactivate the MC145572. They are also used to imple-
ment loopbacks and perform control functions. Some C/I channel commands may cause the
MC145572 to issue a C/I channel response. Table 8–6 summarizes the C/I channel commands and
indications.
C/I channel indications are used to notify a layer 2 device, that certain events have occurred, such
as a change in activation status.
In normal GCI operation, the M4 channel act, dea, uoa, sai, ps1, ps2, and reserved status bits
are handled automatically. It is possible to set bits in the MC145572 register map using Monitor chan-
nel commands that will override the automatic operation of the M4 channel.
NOTES:
b4
AI
AIL
ARL
DEAC Deactivation request accepted
DR
LTD1 (LT mode), NTD1 (NT mode), sets pin “OUT1”
RES
UAI
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
Freescale Semiconductor, Inc.
C/I Codeword
Activation indication
2B+D loopback received over eoc channel,
perform loopback at S/T interface in 2–chip NT1
Activation request with local analog loopback
Deactivation request
high when command is active
Reset
U–only activation indication
b3
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
For More Information On This Product,
Table 8–6. C/I Channel Commands and Indications
b2
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
Go to: www.freescale.com
b1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
MC145572
Command
LTD2
LTD1
UAR
RES
ARL
DR
AR
DC
—
—
—
—
—
—
—
—
LT Mode
Indication
DEAC
RSY
UAI
EI2
AR
—
—
—
—
—
—
—
AI
—
—
DI
AR
DC
DI
EI2
LTD2 (LT mode), NTD2 (NT mode), set
RSY Loss of sync – resync requested
UAR U–only activation request
Deactivation confirm
Activation request
Deactivation indication
Error indication
command is active
pin “OUT2” high when
Command
NTD2
NTD1
RES
ARL
AR
—
—
—
—
—
—
—
AI
—
—
DI
NT Mode
Indication
RSY
AIL
DR
EI2
AR
DC
—
—
—
—
—
—
—
—
AI
—
8–11