Altera CPRI v6.0 MegaCore Function Manual do Utilizador descarregar pdf (Página 59)

alarm indication (RAI). and reset request or acknowledge) in the CPRI hyperframe.

If you connect the AUX interface of your RE slave IP core to a network switch or other routing layer

rather than directly to the downstream RE master, or if you do not fully connect the AUX interface to the

downstream RE master, you can use this Z.130.0 access interface to streamline the transfer of reset

requests and SDI alarms across hops.

This interface has higher transmit priority than access through the CPRI v6.0 IP core registers.

This interface has the following types of signals:

• _local_ signals are output signals from the IP core about the state of this IP core, and also indicate the

IP core will assert the relevant outgoing Z.130.0 bit in the next CPRI hyperframe according to the

transmit priority of this interface.

• _assert signals are input signals the application can use to request that the IP core assert the relevant

outgoing Z.130.0 bit in the next CPRI hyperframe according to the transmit priority of this interface.

You can also connect these signals in an RE master to the corresponding _req output signals of the

upstream RE slave in a multi-hop configuration, to support efficient transfer of reset requests and SDI

alarms to the IP core.

• _remote signals are output signals from the IP core that indicate the IP core received a Z.130.0 byte on

the CPRI link with the relevant bit asserted by the CPRI link partner.

• _req signals are also output signals from the IP core that indicate the IP core received a Z.130.0 byte

on the CPRI link with the relevant bit asserted by the CPRI link partner. However, these signals are

intended to be passed downstream in a multi-hop configuration. If the IP core is an RE slave, and it

connects to an RE master through the Z.130.0 alarm and reset interface in a multi-hop configuration,

you can connect the RE slave IP core _req output signal directly to the corresponding _assert input

signal on the downstream RE master for efficient communication of the reset request or SDI alarm.

Table 3-10: Direct L1 Control and Status Interface Signals

All interface signals are clocked by the cpri_clkout clock.

Signal Name Direction Description

z130_local_lof Output Indicates the IP core has detected a local loss of frame. In

this case, the state_l1_synch output signal indicates the

L1 synchronization state machine is in state XACQ1 or

XACQ2

z130_local_los Output Indicates the IP core has detected a local loss of signal. The

IP core asserts this flag if it detects excessive 8B/10B errors

that trigger the assertion of the optional L1 debug rx_lcv

output signal or the xcvr_los output signal and the rx_

losfield of the L1_CONFIG register.

z130_sdi_assert Input Indicates that the master service access point (SAP) is not

available. Possible causes for this situation are equipment

error or that the connected slave IP core is forwarding an

SDI request it detected to the current RE CPRI master IP

core through a direct connection.

UG-01156

2014.08.18

Direct L1 Control and Status Interface

3-29

Functional Description

Altera Corporation

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