Released
Datasheet
PM73487 QRT
PMC-Sierra, Inc.
PMC-980618
Issue 3
622 Mbps ATM Traffic Management Device
7.2.11 UTOPIA_CONFIG
The UTOPIA_CONFIG register configures both the receive and transmit UTOPIA interface dur-
ing reset. Since this register initializes an internal state machine, alteration during non-reset con-
ditions is not recommended. The transmit UTOPIA watchdog is configured from this register as
well as the use of OUTCHAN insertion in the outgoing cells.
The MSP_MODE bit selects between the following polling methods:
•
•
UTOPIA Level 2 standard polling that uses a single cell available signal
(TATM_CLAV(0) and RATM_CLAV(0)).
UTOPIA Level 2 optional MSP that uses four cell available signals (TATM_CLAV(3:0)
and RATM_CLAV(3:0)) to poll as many as 31 devices in one cell time.
The CHK_HEC bit enables the checking of the HEC of incoming cells. If the device finds a HEC
error, an interrupt is asserted and the cell is dropped in the receive UTOPIA block.
NOTE: The BACKPLANE_MODE bit was excluded from the QRT testing program.
The TX_OC_12C_MODE, RX_OC_12C_MODE, and UTOPIA_2 bits allow the user to select
the configuration of receive and transmit side interfaces independently. The *_OC_12C_MODE
bits take precedence over the UTOPIA_2 bit. For example, for a QRT configured to be
RX_OC_12C_MODE and not TX_OC_12C_MODE and UTOPIA_2, the interface treats the
receive side as a single-PHY interface and the transmit side as a multi-PHY interface requiring
addressing. This feature is useful when interfacing to the PMC-Sierra PM7322 RCMP-800
device. Table 24 explains all combination of these bits.
Table 24. Various ways to configure UTOPIA interface
UTOPIACONFIG(2:0)
111
Explanation
Tx and Rx side configured for single PHY.
110
101
100
011
010
001
000
Tx and Rx side configured for single PHY.
Tx side configured for single PHY, Rx side configured for MPHY.
Tx and Rx side configured for single PHY.
Tx side configured for MPHY, Rx side configured for single PHY. Useful for RCMP applications.
Tx and Rx side configured for single PHY.
Tx and Rx side configured for MPHY.
Tx and Rx side configured for single PHY.
117
PMC [ PMC-SIERRA, INC ]
