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Part IV. Communications Processor Module
See also Section 29.16.1, ÒUsing Transmit Internal Rate Mode.Ó
29.14 ATM Transmit Command
The CPM command set includes an
register (CPCR), described in Section 13.4.1.
The
ATM TRANSMIT
CPCR[SBC[page]] = 0b00100 or 0b00101 (FCC1 or FCC2), CPCR[MCN] =
0b0000_1010) turns a passive channel into an active channel by inserting it into the APC
scheduling table. Note that an
channelÕs TCT is completely initialized and the channel has BDs ready to transmit. Note
also that CPCR[SBC[code]] = 0b01110 and not FCC1 or FCC2 code.
Before issuing the command, the user should initialize COMM_INFO Þelds in the
parameter RAM as described in Figure 29-63.
Offset
0
1
2
0x86
Ñ
0x88
0x8A
Table 29-50 describes COMM_INFO Þelds
Offset
Bits
Name
0x86
0Ð4
Ñ
5
CTB
6Ð10
PHY#
11Ð12
ACT
13-15
PRI
0x88
0-15
CC
0x8A
0-15
BT
29-90
ATM TRANSMIT
command (CPCR[opcode] = 0b1010, CPCR[SBC[code]] = 0b01110,
ATM TRANSMIT
3
4
5
6
CTB
Channel Code (CC)
Figure 29-63. COMM_INFO Field
Table 29-50. COMM_INFO Field Descriptions
Reserved, should be cleared.
Connection tables bus. Used for external channels only
0 External connection tables reside on the 60x bus.
1 External connection tables reside on the local bus.
PHY number. In single PHY mode this Þeld should be cleared In multiple PHY mode this
Þeld is an index to the APC parameter table associated with this channel.
ATM channel type
00 Other channel
01 VBR channel
1x Reserved
APC priority level.
000Ñhighest priority (APC_LEVEL1), 111Ñlowest priority (APC_LEVEL8).
Channel code. The channel code associated with the current channel.
Burst tolerance. For use by VBR channels only (ACT Þeld is 0b01). SpeciÞes the initial burst
tolerance (GCRA burst credit) of the current VC.
MPC8260 PowerQUICC II UserÕs Manual
that can be sent to the CP command
command should be issued only after the
7
8
9
10
11
PHY#
BT
Description
12
13
14
15
ACT
PRI
MOTOROLA
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