Released
Datasheet
PM73487 QRT
PMC-Sierra, Inc.
PMC-980618
Issue 3
622 Mbps ATM Traffic Management Device
7.2.13 UT_ENABLE
The UT_ENABLE register enables whether or not the polling results from the PHY device will be
considered during the UTOPIA PHY device selection mechanism. The UT_ENABLE register is
also used to set the number of devices that will be polled when the standard polling method is
used. Enabling only the devices that are used and configuring the system so the device addresses
are grouped together in the lower address range provides the best results for the implemented
standard polling algorithm. For MSP mode, all devices are polled regardless of whether or not
they are enabled, but again, the enable is used to mask out those that are either not on the bus or
are turned off. This register is configurable independent of software reset and can be changed dur-
ing cell flow. When the UTOPIA_CONFIG TDM bit is set, the UT_ENABLE register is also
used to define the TDM Priority Pool.
Address: 12h (48h byte)
Type: Read/Write
Format: Refer to the following table.
Field (Bits)
Description
Not used
(31)
Write with a 0 to maintain software compatibility with future versions.
UT_ENABLE
(30)
1
0
Enable cell transmission from PHY device 30.
Disable cell transmission from PHY device 30.
UT_ENABLE
(29)
1
0
Enable cell transmission from PHY device 29.
Disable cell transmission from PHY device 29.
.
.
.
.
.
.
UT_ENABLE
(0)
1
0
Enable cell transmission from PHY device 0.
Disable cell transmission from PHY device 0.
A transition on any of these bits clears the corresponding entry in the TX_UT_WD_ALIVE regis-
ter (refer to “TX_UT_WD_ALIVE” on page 121).
120
PMC [ PMC-SIERRA, INC ]
