ATM Controller and AAL0, AAL1, and AAL5
MPC8260 PowerQUICC II Family Reference Manual, Rev. 2
Freescale Semiconductor 30-89
8 ICD Idle cells discard
0 Discard idle cells (GFC, VPI, VCI, PT I =0)
1 Do not discard idle cells
Note:For IM A1 It is recommended to program ICD=1 so that idle cells will not be discarded.
Idle cells should not occur on an IMA link, and their presence indicates an IMA protocol
violation. Software should disable the discarding of idle cells, route the idle cells to a
dedicated channel, and treat reception of cells on that dedicated channel as an indication
of a system or system configuration error
9 TUMS Transmit UTOPIA master/slave mode
0 Transmit UTOPIA master mode is selected (Use this mode for IMA support1)
1 Transmit UTOPIA slave mode is selected
10 RUMS Receive UTOPIA master/slave mode
0 Receive UTOPIA master mode is selected (Use this mode for IMA support1)
1 Receive UTOPIA slave mode is selected
11–15 LAST
PHY/
PHY ID
Last PHY. (Multiple PHY master mode only.) The UTOPIA interface polls all PHYs starting from
PHY address 0 and ending with the PHY address specified in LAST PHY. (The number of active
PHYs are LAST PHY+1). LAST PHY should be specified in both single-Clav and direct-polling
modes.
PHY ID. (Multiple PHY slave mode only.) Determines the PHY address of the ATM controller
when configured as a slave in a multiple PHY ATM port.
Note:For IM A1 support this field must be programmed to the PHY address of the last PHY
device; it is unrelated to the “virtual PHY number” for the IMA group programmed into
VPHYNUM.
16–17 Reserved, should be cleared.
18 TPRI Transmitter priority. Used to adjust the default priority of the FCC transmitter. It is strongly
recommended to set TPRI when in multi-PHY mode, or in single-PHY mode if the maximal bit
rate (either internal or external rate) is higher than that of the other FCCs; for other modes, it
should remain cleared.
0 Default operation
1 Prevents elevation to emergency mode
Refer to Tabl e 14- 2 .
19 TUDC Transmit user-defined cells
0 Regular 53-byte cells (Disable this mode for IMA support1)
1 User-defined cells
20 RUDC Receive user-defined cells
0 Regular 53-byte cells (Disable this mode for IMA support1)
1 User-defined cells
21 RxP Receive parity check.
0 Check Rx parity line
1 Do not c heck Rx parity line
22 TUMP Transmit UTOPIA multiple PHY mode
0 Transmit UTOPIA single PHY mode is selected
1 Transmit UTOPIA multiple PHY mode is selected (Use this mode for IMA support1)
23 Reserved, should be cleared.
Table3 0-47. FCC ATM Mode Register (FPSM R) (continued)
Bits Name Description