Motorola MPC8260 - Manual (Page 867)

29-87 MPC8260 PowerQUICC II UserÕs Manual MOTOROLA
Part IV. Communications Processor Module
29.13.3 ATM Event Register (FCCE)/Mask Register (FCCM)
The FCCE register is the ATM controller event register when the FCC operates in ATM
mode. When it recognizes an event, the ATM controller sets the corresponding FCCE bit.
Interrupts generated by this register can be masked in FCCM. FCCE is memory-mapped
and can be read at any time. Bits are cleared by writing ones to them; writing zeros has no
effect. Unmasked bits must be cleared before the CP clears the internal interrupt request.
FCCM is the ATM controller mask register. It is a 16-bit read/write register with the same
bit format as FCCE. If an FCCM bit is set, the corresponding interrupt is enabled in FCCE.
If it is cleared, the corresponding interrupt is masked. FCCM is cleared at reset.
21 RxP Receive parity check.
0 Check Rx parity line.
1 Do not check 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.
23 Ñ Reserved, should be cleared.
24 TSIZE Transmit UTOPIA data bus size
0 UTOPIA 8-bit data bus size.
1 UTOPIA 16-bit data bus size.
25 RSIZE Receive UTOPIA data bus size
0 UTOPIA 8-bit data bus size.
1 UTOPIA 16-bit data bus size.
26 UPRM UTOPIA priority mode.
0 Round robin. Polling is done from PHY zero to the PHY speciÞed in LAST PHY. When a
PHY is selected, the UTOPIA interface continues to poll the next PHY in order.
1 Fixed priority. Polling is done from PHY zero to the PHY speciÞed in LAST PHY. When a
PHY is selected, the UTOPIA interface continues to poll from PHY zero.
27 UPLM UTOPIA polling mode.
0 Multiplex polling. Polling is done using RxAdd[0Ð4] and Clav[0]. Selection is done using
RxAdd[0Ð4]. Up to 31 PHYs can be polled.
1 Direct polling. Polling is done using Clav[0Ð3]. Selection is done using RxAdd[0Ð2]. Up to 4
PHYs can be polled.
28 RUMP Receive UTOPIA multiple PHY mode.
0 Receive UTOPIA single PHY mode is selected.
1 Receive UTOPIA multiple PHY mode is selected.
29 HECI HEC included. Used in UDC mode only.
0 HEC octet is not included when UDC mode is enabled.
1 HEC octet is included when UDC mode is enabled.
30Р31 С Reserved, should be cleared.
Table 29-47. FCC ATM Mode Register (FPSMR) (Continued)
Bits Name Description