Motorola MPC8260 User Manual

29-90

MOTOROLA

See also Section 29.16.1, ÒUsing Transmit Internal Rate Mode.Ó

The CPM command set includes an 

ATM

 

TRANSMIT

 that can be sent to the CP command

register (CPCR), described in Section 13.4.1.

The 

ATM

 

TRANSMIT

 command (CPCR[opcode] = 0b1010, CPCR[SBC[code]] = 0b01110,

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 

ATM

 

TRANSMIT

 command should be issued only after the

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

3

4

5

6

7

8

9

10

11

12

13

14

15

0x86

Ñ

0x88

0x8A

0x86

0Ð4

Ñ

Reserved, should be cleared.

5

CTB

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.

6Ð10

PHY#

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. 

11Ð12

ACT

ATM channel type
00 Other channel
01 VBR channel
1x Reserved

13-15

PRI

APC priority level.
000Ñhighest priority (APC_LEVEL1), 111Ñlowest priority (APC_LEVEL8).

0x88

0-15

CC

Channel code. The channel code associated with the current channel. 

0x8A

0-15

BT

Burst tolerance. For use by VBR channels only (ACT Þeld is 0b01). SpeciÞes the initial burst 
tolerance (GCRA burst credit) of the current VC.